A coagulant aid based on hyaluronic acid, preparation method, application, and sewage treatment method

Abstract

This application belongs to the field of water treatment technology, and specifically relates to a coagulant aid agent based on hyaluronic acid, a preparation method, an application, and a sewage treatment method. The coagulant aid agent is composed of hyaluronic acid, biochar, and water. The mass-volume ratio of hyaluronic acid, biochar, and water is (0.2 - 2) g: 0.2 g: 1 L, and the molecular level of the hyaluronic acid solution is 1 million - 1.3 million molecular levels. Therefore, it can solve the problems of residual toxic substances in water after the use of the coagulant aid agent and secondary pollution caused by synthesis. It can also improve the effect of coagulation sedimentation and the efficiency of sludge sedimentation and dehydration, making up for the defect that the traditional coagulant aid agent PAM may produce organic substances harmful to the human body after treating water bodies, and is more environmentally friendly.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and more specifically, to a coagulant aid based on hyaluronic acid, a preparation method, an application, and a sewage treatment method. Background Art

[0002] At present, most water plants adopt the conventional traditional process of coagulation - sedimentation - filtration - disinfection. The advantages and disadvantages of enhanced coagulation for algae removal and organic matter removal are often affected by factors such as water quality, water temperature, the type of coagulant aid, and its dosage. The coagulant aid is the key in the water treatment technology of the coagulation method. The coagulant aid is a chemical added to adjust or improve the coagulation conditions and promote the coagulation effect or a polymer substance to improve the structure of the floc. Therefore, the research and development of a new coagulant aid is of great significance in water treatment.

[0003] At present, the existing traditional coagulant aids on the market are mainly polyacrylamide (PAM). It is widely used in coagulation sedimentation and sludge dewatering. When applied in sludge dewatering, its dosage is difficult to control. When the dosage reaches a certain value, the sludge flocs no longer grow larger. Continuing to increase the dosage not only fails to form flocs but instead makes the sludge turbid, and the sludge shaping is poor, affecting the sludge dewatering efficiency. Polyacrylamide also has a fatal disadvantage, that is, it has a certain biological toxicity, and its toxicity comes from some organic substances in the components. Due to its toxicity, there is still a certain residue in the water treated with polyacrylamide, which will bring certain potential safety hazards to subsequent use. Summary of the Invention

[0004] The present application is provided to solve the above - mentioned defects existing in the prior art. A coagulant aid based on hyaluronic acid, a preparation method, an application, and a sewage treatment method are needed to solve the problems of residual toxic substances in water after the use of the coagulant aid and secondary pollution easily caused by synthesis, and also to improve the coagulation sedimentation effect and the efficiency of sludge sedimentation and dewatering.

[0005] In the first aspect of the present application, a coagulant aid based on hyaluronic acid is provided. The coagulant aid is composed of hyaluronic acid, biochar, and water. The mass - volume ratio of hyaluronic acid, biochar, and water is (0.2 - 2) g: 0.2 g: 1 L, and the molecular level of the hyaluronic acid solution is 1 million - 1.3 million molecular levels.

[0006] In the second aspect of the present application, an application of the coagulant aid according to any embodiment of the present application in sewage treatment is provided.

[0007] In the third aspect of the present application, a preparation method of the coagulant aid according to any embodiment of the present application is provided. The coagulant aid is obtained by mixing the hyaluronic acid and biochar powder with water.

[0008] In the fourth aspect of the present application, a method for treating sewage containing organic carbon is provided. The treatment method includes: adding a flocculant to the sewage first, then adding the coagulant aid described in any embodiment of the present application, stirring and then standing still. The sewage after standing is subjected to solid-liquid separation to obtain treated water. The sewage has a sludge specific resistance less than 1.2×10 9 s 2 / g, and the TOC in the sewage is greater than 3.5 mg / L.

[0009] In the fifth aspect of the present application, a method for treating sewage in a sludge thickening tank is provided. The treatment method includes adding the coagulant aid described in any embodiment of the present application to the sewage, stirring and then standing still. The sewage includes sludge discharge water from the reaction tank, sludge discharge water from the sedimentation tank, and / or backwashing wastewater from the filter. The sludge specific resistance value of the sewage is greater than (1-3)×10 9 s 2 / g.

[0010] The coagulant aid based on hyaluronic acid, preparation method, application, and sewage treatment method provided in each embodiment of the present application. The coagulant aid includes hyaluronic acid and biochar. Both hyaluronic acid and biochar are non-toxic substances. The treated water body is non-toxic and harmless to the human body and has no adverse impact on the environment. Hyaluronic acid and biochar cooperate with each other, not only improving the adsorption and viscosity, so that small particles in the sewage aggregate into larger and more stable large particles for precipitation, making the solid suspended matter aggregated in the water settle quickly, and improving its coagulation and sedimentation effect. For sewage containing sludge, it has good coagulation effect, forms large flocs, high strength, is not easy to break, does not increase the amount of sludge cake, and has no corrosion, thus better improving the efficiency of sludge dewatering, being able to improve the sludge dewatering efficiency and reduce the water content of the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In the drawings which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used together with the description and the claims to explain the embodiments of the application being claimed. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be an exhaustive or exclusive embodiment of the device or method.

[0012] Figure 1 Shows the adsorption treatment schematic diagram of the coagulant aid according to the experimental example of the present application;

[0013] Figure 2 Shows the sewage treatment comparison diagram according to different embodiments of the present application;

[0014] Figure 3 Shows a comparison chart of sludge moisture content according to different embodiments of the present application;

[0015] Figure 4 Shows a comparison chart of the treatment effects of different flocculants according to the present application;

[0016] Figure 5 Shows a comparison chart of the treatment effects of biochar and activated carbon according to the present application;

[0017] Figure 6 Shows a comparison chart of the treatment effects of different hyaluronic acid molecular weights according to the present application;

[0018] Figure 7 Shows a comparison chart of the growth inhibition rate of Photobacterium phosphoreum by different coagulant aids according to the present application. Detailed implementation manners

[0019] To enable those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific examples, but it is not a limitation to the present application.

[0020] The "first", "second" and similar terms used in the present application do not indicate any order, quantity or importance, but are only used for distinction. Words such as "including" or "comprising" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0021] According to an embodiment of the present application, a coagulant aid based on hyaluronic acid is provided. The coagulant aid includes hyaluronic acid, biomass carbon and water. The mass-volume ratio of hyaluronic acid, biomass carbon and water is (0.2-2) g: 0.2 g: 1 L, and the molecular level of the hyaluronic acid solution is 1 million to 1.3 million molecular levels.

[0022] Figure 1 It is a microscopic schematic diagram of the coagulation adsorption of the coagulant aid in water. In the present application, hyaluronic acid and biomass carbon are selected to form a coagulant aid. The crystal nucleus adsorption performance of biomass carbon is utilized, and the adsorption capacity of biomass carbon is improved by using hyaluronic acid, so that the coagulant aid has extremely strong adsorption and viscosity, making the water phase sticky, promoting the small particles formed to precipitate and aggregate into larger and more stable large particle precipitates, and quickly settling the solid suspended matters aggregated in the water, improving its coagulation and sedimentation effect. The coagulant aid of the present application can also increase the contact area between sludge particles, especially the contact between large particles and small particles, improve the contact efficiency between sludge and water, and thus improve the efficiency of sludge dewatering.

[0023] In addition, hyaluronic acid and biochar have a better cooperation effect compared to hyaluronic acid and activated carbon. Although the adsorption effect of activated carbon is better, it is found in this application that the combination of biochar and hyaluronic acid has a better coagulation aid effect in sewage.

[0024] The water body treated with the coagulation aid agent of this application is non-toxic and harmless to humans and has no adverse effects on the environment, making up for the defect that the traditional coagulation aid agent PAM (polyacrylamide) may produce harmful organic substances to humans after treating the water body, and is more environmentally friendly.

[0025] In some embodiments, the mass-volume ratio of hyaluronic acid, biochar and water is (1.4 - 2) g : 0.2 g : 1 L.

[0026] According to an embodiment of this application, a preparation method of the coagulation aid agent described in any embodiment of this application is also provided, in which the hyaluronic acid and biochar powder are mixed with water to obtain the coagulation aid agent.

[0027] According to an embodiment of this application, an application of the coagulation aid agent described in any embodiment of this application in sewage treatment is also provided.

[0028] According to an embodiment of this application, a treatment method for sewage containing organic carbon is also provided. The treatment method includes: adding a flocculant to the sewage first, then adding the coagulation aid agent described in any embodiment of this application, stirring and then standing, and separating the solid and liquid of the standing sewage to obtain the treated water. The sewage has a sludge specific resistance less than 1.2×10 9 s 2 / g and the TOC in the sewage is greater than 3.5 mg / L.

[0029] The coagulation aid agent of this application can enhance the effect of flocculants (such as PAC, etc.), help form a harder and more persistent sludge floc structure, and has a significant effect on reducing water quality indicators such as turbidity, TOC, UV, and COD in water.

[0030] In some embodiments, after adding the coagulation aid agent, the concentration of hyaluronic acid in the coagulation aid agent in the sewage is 0.2 - 2 mg / L. Preferably, after adding the coagulation aid agent, the concentration of hyaluronic acid in the coagulation aid agent in the sewage is 1.4 - 2 mg / L.

[0031] In some embodiments, the flocculant is polyaluminum chloride. Compared with other flocculants, the combination of the coagulation aid agent of this application and polyaluminum chloride can better remove small particles in sewage.

[0032] In some embodiments, high-speed stirring, medium-speed stirring, and low-speed stirring are sequentially performed during the sewage treatment process; a flocculant is added under the state of high-speed stirring of the sewage, and the coagulant aid described in any embodiment of the present application is added after the medium-speed stirring ends and before the low-speed stirring. If the flocculant is added after the low-speed stirring, a good flocculation effect cannot be achieved.

[0033] In some embodiments, the rotation speed of the high-speed stirring is 230 - 300 r / min, and the time of the high-speed stirring is 20 - 40 s; the rotation speed of the medium-speed stirring is 160 - 210 r / min, and the time of the medium-speed stirring is 0.8 - 1.2 min; the rotation speed of the low-speed stirring is 40 - 60 r / min, and the time of the low-speed stirring is 8 - 12 min.

[0034] According to an embodiment of the present application, a method for treating sewage in a sludge thickening tank is further provided. The treatment method includes adding the coagulant aid described in any embodiment of the present application to the sewage, stirring, and then standing still. The sewage includes sludge discharge water from a reaction tank, sludge discharge water from a sedimentation tank, and / or backwashing wastewater from a filter tank, and the sludge specific resistance value of the sewage is greater than (1 - 3)×10 9 s 2 / g.

[0035] In some embodiments, the pH of the sewage is 6 - 9; the temperature of the sewage is 20 - 25°C. Preferably, the temperature of the reaction system in all the above steps is maintained at 20 - 25°C. By controlling the temperature of the reaction system within the above range, the present application can not only ensure a high precipitation rate but also avoid increasing the solubility of solid-insoluble substances under low or high temperature conditions, achieving a better removal effect. The pH of the sewage can be adjusted to 6 - 9 by adding acid-base reagents.

[0036] In some embodiments, after the coagulant aid is added to the sewage, the concentration of hyaluronic acid in the sewage is 0.4 - 2 mg / L. Preferably, after the coagulant aid is added to the sewage, the concentration of hyaluronic acid in the sewage is 1 - 2 mg / L.

[0037] The sewage in Examples 1 - 10 and Comparative Examples 1 - 7 is the effluent of a sewage treatment plant in Shandong Province, and the instrument used is a six-connected stirrer.

[0038] In Examples 1 - 15, the preparation method of the polymer composite coagulant aid includes: putting hyaluronic acid powder and biomass powder carbon into a beaker, adding water to dissolve, stirring on a magnetic stirrer or stirring with a glass rod until completely dissolved, then sealing with tin foil and standing still at low temperature for 24 hours before use to obtain the polymer composite coagulant aid.

[0039] Example 1

[0040] In this experiment, 0.2 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 2 g / L.

[0041] The concentration of the prepared flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0042] 1 L of sewage was placed in a six-blade stirrer. The dosing sequence of the agents was as follows: 1 mL of the prepared PAC aqueous solution was added before high-speed stirring, and 1 mL of the polymer composite coagulant aid was added after medium-speed stirring and before low-speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 2 mg / L. After stirring, it was left to stand for 30 min, and then the supernatant was taken for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0043] The water quality indicators of the raw water sample were: turbidity 4.87 NTU, UV 0.099, and TOC 3.9 mg / L.

[0044] Through the method described above, after coagulation stirring treatment on a six-blade stirrer and standing for 30 min, the data of the supernatant taken for determination were: turbidity 0.786 NTU, removal rate 83.86%; UV 0.068, removal rate 31.31%; TOC 2.47 mg / L, removal rate 36.67%.

[0045] Example 2

[0046] In this experiment, 0.16 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 1.6 g / L.

[0047] The concentration of the prepared flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0048] 1 L of sewage was placed in a six-blade stirrer. The dosing sequence of the agents was as follows: 1 mL of the prepared PAC aqueous solution was added before high-speed stirring, and 1 mL of the polymer composite coagulant aid was added after medium-speed stirring and before low-speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 1.6 mg / L. After stirring, it was left to stand for 30 min, and then the supernatant was taken for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0049] The water quality indicators of the raw water sample were: turbidity 4.87 NTU, UV 0.099, and TOC 3.9 mg / L.

[0050] Through the above-described method, after coagulation stirring treatment on a six-connected stirrer and standing for 30 minutes, the data obtained by taking the supernatant for measurement are as follows: the turbidity is 0.832 NTU, and the removal rate is 82.91%; the UV is 0.069, and the removal rate is 30.3%; the TOC is 2.53 mg / L, and the removal rate is 35.13%.

[0051] Example 3

[0052] In this experiment, 0.14 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid was 1.4 g / L.

[0053] The concentration of the configured flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0054] 1 L of sewage was put into a six-connected stirrer. The dosing sequence of the agents was to add 1 mL of the configured PAC aqueous solution before high-speed stirring, and add 1 mL of the polymer composite coagulant aid after medium-speed stirring and before low-speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 1.4 mg / L. After stirring, it was left standing for 30 minutes, and the supernatant was taken for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0055] The water quality indicators of the raw water sample: the turbidity was 4.87 NTU, the UV was 0.099, and the TOC was 3.9 mg / L.

[0056] Through the above-described method, after coagulation stirring treatment on a six-connected stirrer and standing for 30 minutes, the data obtained by taking the supernatant for measurement are as follows: the turbidity is 0.886 NTU, and the removal rate is 81.8%; the UV is 0.070, and the removal rate is 29.29%; the TOC is 2.59 mg / L, and the removal rate is 33.59%.

[0057] Example 4

[0058] In this experiment, 0.12 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid was 1.2 g / L.

[0059] The concentration of the configured flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0060] Put 1 L of sewage into a six - stirrer. The dosing sequence of the agents is as follows: add 1 mL of the prepared PAC aqueous solution of the flocculant before high - speed stirring, and add 1 mL of the polymer composite coagulant aid before slow - speed stirring after medium - speed stirring ends. The concentration of PAC in the sewage is 40 mg / L, and the concentration of hyaluronic acid in the sewage is 1.2 mg / L. After stirring ends, let it stand for 30 min, and then take the supernatant for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0061] Water quality indicators of the raw water sample: turbidity is 4.87 NTU, UV is 0.099, and TOC is 3.9 mg / L.

[0062] Through the method described above, after coagulation and stirring treatment on the six - stirrer, the data obtained by taking the supernatant after standing for 30 min are as follows: turbidity is 0.932 NTU, and the removal rate is 80.86%; UV is 0.071, and the removal rate is 28.28%; TOC is 2.87 mg / L, and the removal rate is 26.41%.

[0063] Example 5

[0064] In this experiment, 0.1 g of hyaluronic acid powder and 0.02 g of biomass carbon powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid is 1 g / L.

[0065] The concentration of the prepared PAC (polyaluminum chloride) aqueous solution is 40 g / L.

[0066] Put 1 L of sewage into a six - stirrer. The dosing sequence of the agents is as follows: add 1 mL of the prepared PAC of the flocculant before high - speed stirring, and add 1 mL of the polymer composite coagulant aid before slow - speed stirring after medium - speed stirring ends. The concentration of PAC in the sewage is 40 mg / L, and the concentration of hyaluronic acid in the sewage is 1 mg / L. After stirring ends, let it stand for 30 min, and then take the supernatant for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0067] Water quality indicators of the raw water sample: turbidity is 4.87 NTU, UV is 0.099, and TOC is 3.9 mg / L.

[0068] Through the method described above, after coagulation and stirring treatment on the six - stirrer, the data obtained by taking the supernatant after standing for 30 min are as follows: turbidity is 1.12 NTU, and the removal rate is 77%; UV is 0.073, and the removal rate is 26.26%; TOC is 2.93 mg / L, and the removal rate is 24.87%.

[0069] Example 6

[0070] In this experiment, 0.08 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 0.8 g / L.

[0071] The concentration of the prepared flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0072] 1 L of sewage was placed in a six-connected stirrer. The dosing order of the agents was to add 1 mL of the prepared PAC aqueous solution before high-speed stirring, and 1 mL of the polymer composite coagulant aid after medium-speed stirring and before low-speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 0.8 mg / L. After stirring, it was left to stand for 30 min, and the supernatant was taken for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0073] The water quality indicators of the raw water sample: turbidity was 4.87 NTU, UV was 0.099, and TOC was 3.9 mg / L.

[0074] Through the method described above, after coagulation stirring treatment on a six-connected stirrer and standing for 30 min, the data of the supernatant taken for determination were: turbidity was 0.96 NTU, and the removal rate was 80.28%; UV was 0.073, and the removal rate was 26.26%; TOC was 2.94 mg / L, and the removal rate was 24.61%.

[0075] Example 7

[0076] In this experiment, 0.06 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 0.6 g / L.

[0077] The concentration of the prepared flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0078] 1 L of sewage was placed in a six-connected stirrer. The dosing order of the agents was to add 1 mL of the prepared PAC aqueous solution before high-speed stirring, and 1 mL of the polymer composite coagulant aid after medium-speed stirring and before low-speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 0.6 mg / L. After stirring, it was left to stand for 30 min, and the supernatant was taken for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0079] The water quality indicators of the raw water sample: turbidity was 4.87 NTU, UV was 0.099, and TOC was 3.9 mg / L.

[0080] Using the method described above, after coagulation stirring treatment on a six - stirrer, the data obtained by taking the supernatant after standing for 30 min for measurement are as follows: turbidity is 0.98 NTU, removal rate is 79.87%; UV is 0.072, removal rate is 27.27%; TOC is 3.1 mg / L, removal rate is 20.51%.

[0081] Example 8

[0082] In this experiment, 0.04 g of hyaluronic acid powder and 0.02 g of biomass carbon powder were compound - added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid was 0.4 g / L.

[0083] The concentration of the flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0084] 1 L of sewage was put into a six - stirrer. The dosing sequence of the agents was to add 1 mL of the configured PAC aqueous solution before high - speed stirring, and add 1 mL of the polymer composite coagulant aid after medium - speed stirring and before slow - speed stirring. The concentration of PAC in the sewage was 40 mg / L, and the concentration of hyaluronic acid in the sewage was 0.4 mg / L. After stirring, it was left to stand for 30 min, and the supernatant was taken for measurement of a series of water quality indicators such as turbidity, UV, and TOC.

[0085] The water quality indicators of the raw water sample: turbidity was 4.87 NTU, UV was 0.099, and TOC was 3.9 mg / L.

[0086] Using the method described above, after coagulation stirring treatment on a six - stirrer, the data obtained by taking the supernatant after standing for 30 min for measurement are as follows: turbidity is 1.1 NTU, removal rate is 77.41%; UV is 0.072, removal rate is 27.27%; TOC is 3.08 mg / L, removal rate is 21.02%.

[0087] Example 9

[0088] In this experiment, 0.03 g of hyaluronic acid powder and 0.02 g of biomass carbon powder were compound - added to 100 ml of ultrapure water. The concentration of hyaluronic acid in the configured polymer composite coagulant aid was 0.3 g / L.

[0089] The concentration of the configured flocculant PAC (polyaluminum chloride) aqueous solution was 40 g / L.

[0090] Put 1 L of sewage into a six - connected stirrer. The dosing sequence of the agents is as follows: add 1 mL of the prepared aqueous solution of the flocculant PAC before high - speed stirring, and add 1 mL of the polymer composite coagulant aid after medium - speed stirring and before slow - speed stirring. The concentration of PAC in the sewage is 40 mg / L, and the concentration of hyaluronic acid in the sewage is 0.3 mg / L. After stirring, let it stand for 30 min, and then take the supernatant for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0091] Water quality indicators of the raw water sample: turbidity is 4.87 NTU, UV is 0.099, and TOC is 3.9 mg / L.

[0092] Through the method described above, after coagulation and stirring treatment on the six - connected stirrer, the data obtained by taking the supernatant after standing for 30 min for determination are as follows: turbidity is 1.21 NTU, and the removal rate is 75.15%; UV is 0.071, and the removal rate is 28.28%; TOC is 3.06 mg / L, and the removal rate is 21.54%.

[0093] Example 10

[0094] In this experiment, 0.02 g of hyaluronic acid powder and 0.02 g of biomass carbon powder were compound - added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 0.2 g / L.

[0095] The concentration of the prepared aqueous solution of the flocculant PAC (poly - aluminum chloride) is 40 g / L.

[0096] Put 1 L of sewage into a six - connected stirrer. The dosing sequence of the agents is as follows: add 1 mL of the prepared aqueous solution of the flocculant PAC before high - speed stirring, and add 1 mL of the polymer composite coagulant aid after medium - speed stirring and before slow - speed stirring. The concentration of PAC in the sewage is 40 mg / L, and the concentration of hyaluronic acid in the sewage is 0.2 mg / L. After stirring, let it stand for 30 min, and then take the supernatant for the determination of a series of water quality indicators such as turbidity, UV, and TOC.

[0097] Water quality indicators of the raw water sample: turbidity is 4.87 NTU, UV is 0.099, and TOC is 3.9 mg / L.

[0098] Through the method described above, after coagulation and stirring treatment on the six - connected stirrer, the data obtained by taking the supernatant after standing for 30 min for determination are as follows: turbidity is 1.31 NTU, and the removal rate is 73.1%; UV is 0.076, and the removal rate is 23.238%; TOC is 2.99 mg / L, and the removal rate is 23.33%.

[0099] Examples 11 - 15 and Comparative Examples 8 - 10 For the sludge dewatering examples, the sludge in the sludge pond of a sewage treatment plant in Shandong Province was used for experiments. The sludge dewatering process of this plant requires the sludge to first enter the sludge discharge water and be discharged to the sludge thickening tank for sludge thickening, then the sludge is dewatered and transported to the sludge filter press for the external transportation of dry sludge, meeting the sludge treatment standards.

[0100] The original sludge has a high organic matter content, is prone to rotting and emitting odors, has fine particles, a high water content, a small specific gravity, and a large volume after concentration or digestion. The sludge sedimentation performance is very poor, and it is difficult to dewater the sludge.

[0101] For the sludge dewatering experiments of Examples 11 - 15 and Comparative Examples 8 - 10, the experiments were uniformly carried out by taking the sludge discharge water and the water sample from the sludge thickening tank of this plant, and making the volume constant at 1000 ml for the test.

[0102] After measurement, some indicators of the original sludge water sample were as follows: the water content was 97.22%, the sludge specific resistance value measured by the sludge specific resistance device was 3.47×10 9 s 2 / g, the turbidity of the original sludge filtrate was 20 NTU, the COD of the sludge filtrate was 420 mg / L, and the initial mud - water separation interface was 500 mm.

[0103] Example 11

[0104] In this experiment, 0.2 g of hyaluronic acid powder and 0.02 g of biomass carbon powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid was 2 g / L.

[0105] 1 L of the sludge discharge water sample was placed in a six - stirrer. 1 mL of the polymer composite coagulant aid was added to the sludge discharge water sample, and the hyaluronic acid concentration in the sludge discharge water sample was 2 mg / L respectively. After the stirring ended, it was left standing for 30 min. The supernatant of the treated water sample was taken for the determination of a series of water quality indicators such as turbidity and COD, and the influence of the coagulant aid on the flocculation and precipitation effect of the sludge discharge water and the optimal dosage concentration was analyzed.

[0106] 1 L of the sludge gravity thickening tank water sample was placed in a six - stirrer. 1 mL of the polymer composite coagulant aid was added to the sludge gravity thickening tank water sample, and the hyaluronic acid concentration in the sludge gravity thickening tank water sample was 2 mg / L respectively. The changes in the sludge water content and sludge specific resistance were measured, and the change in the height of the mud - water separation interface of the water sample with the increase of the dosing time was observed to reflect the sludge thickening effect.

[0107] The turbidity of the treated sludge discharge water sample was 8 NTU, and the reduction rate was 60%. The COD of the treated sludge discharge water sample was 92 mg / L, and the reduction rate was 78%.

[0108] The sludge moisture content of the treated sludge thickening tank water sample is 59.8%, and the reduction rate is 38.49%. The sludge specific resistance of the treated sludge thickening tank water sample is 1.97×10 9 s 2 / g, and the reduction rate is 43.22%. After being treated with this agent, the mud-water separation interface drops from 500 mm to 440 mm within 20 min, with a reduction rate of 12%, and it continues to decrease with the increase of time. The water sample is clearly stratified and the supernatant is clear. The flocs increase, the sludge is relatively compact, the sludge sedimentation performance is good, and the sludge dewatering efficiency is high.

[0109] Example 12

[0110] In this experiment, 0.1 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid was 1 g / L.

[0111] Put 1 L of the sludge discharge tank water sample into a six-connected stirrer, add 1 mL of the polymer composite coagulant aid to the sludge discharge tank water sample. The hyaluronic acid concentrations in the sludge discharge tank water sample were 1 mg / L respectively. After stirring, let it stand for 30 min. Take the supernatant of the treated water sample for the determination of a series of water quality indicators such as turbidity and COD, and analyze the influence of the coagulant aid on the flocculation and precipitation effect of the sludge discharge water and the optimal dosing concentration.

[0112] Put 1 L of the sludge gravity thickening tank into a six-connected stirrer, add 1 mL of the polymer composite coagulant aid to the sludge gravity thickening tank water sample. The hyaluronic acid concentrations in the sludge gravity thickening tank water sample were 1 mg / L respectively. Measure the changes in its sludge moisture content and sludge specific resistance, and observe the change of the mud-water separation interface height of the water sample with the increase of the dosing time to reflect the thickening effect of the sludge.

[0113] The turbidity of the treated sludge discharge tank water sample is 9 NTU, and the reduction rate is 55%. The COD of the treated sludge discharge tank water sample is 98 mg / L, and the reduction rate is 76.67%.

[0114] The sludge moisture content of the treated sludge thickening tank water sample is 59.9%, and the reduction rate is 39.31%. The sludge specific resistance of the treated sludge thickening tank water sample is 2.01×10 9 s 2 / g, and the reduction rate is 42.07%. After being treated with this agent, the mud-water separation interface drops from 500 mm to 450 mm within 20 min, with a reduction rate of 10%, and it continues to decrease with the increase of time. The water sample is clearly stratified and the supernatant is clear. The flocs increase, the sludge is relatively compact, the sludge sedimentation performance is good, and the sludge dewatering efficiency is high.

[0115] Example 13

[0116] In this experiment, 0.08 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 0.8 g / L.

[0117] 1 L of the sludge discharge pond water sample was placed in a six - stirrer. 1 mL of the polymer composite coagulant aid was added to the sludge discharge pond water sample. The hyaluronic acid concentrations in the sludge discharge pond water sample were 0.8 mg / L respectively. After stirring, it was allowed to stand for 30 min. The supernatant of the treated water sample was taken for the determination of a series of water quality indicators such as turbidity and COD to analyze the influence of the coagulant aid on the flocculation and precipitation effect of the sludge discharge water and the optimal dosing concentration.

[0118] 1 mL of the sludge gravity thickening pond water sample was placed in a six - stirrer. 0.1 mL of the polymer composite coagulant aid was added to the sludge gravity thickening pond water sample. The hyaluronic acid concentrations in the sludge gravity thickening pond water sample were 0.8 mg / L respectively. The changes in its sludge moisture content and sludge specific resistance were measured, and the change in the height of the water - sludge separation interface with the increase of the dosing time was observed to reflect the thickening effect of the sludge.

[0119] The turbidity of the treated sludge discharge pond water sample was 10 NTU, and the reduction rate was 50%. The COD of the treated sludge discharge pond water sample was 101 mg / L, and the reduction rate was 75.59%.

[0120] The sludge moisture content of the treated sludge thickening pond water sample was 59.5%, and the reduction rate was 38.79%. The sludge specific resistance value of the treated sludge thickening pond water sample was 2.31×10 9 s 2 / g, and the reduction rate was 33.42%. After being treated with this agent, its water - sludge separation interface dropped from 500 mm to 455 mm within 20 min, and the reduction rate was 9%. It continued to decrease with time. The water sample was clearly stratified, the supernatant was clear, the sludge was relatively compact, the flocs increased, the sludge sedimentation performance was good, and the sludge dewatering efficiency was high.

[0121] Example 14

[0122] In this experiment, 0.06 g of hyaluronic acid powder and 0.02 g of biochar powder were compounded and added to 100 ml of ultrapure water. The concentration of the hyaluronic acid solution in the prepared polymer composite coagulant aid was 0.6 g / L.

[0123] Put 1 L of the water sample from the sludge drainage tank into a six - stirrer, add 1 mL of the polymer composite coagulant aid into the water sample of the sludge drainage tank. The hyaluronic acid concentrations in the water samples of the sludge drainage tank are 0.6 mg / L respectively. After stirring, let it stand for 30 min. Take the supernatant of the treated water sample to measure a series of water quality indicators such as turbidity and COD, and analyze the influence of the coagulant aid on the flocculation and precipitation effect of the sludge drainage water and the optimal dosing concentration.

[0124] Put 1 L of the sludge gravity thickening tank into a six - stirrer, add 1 mL of the polymer composite coagulant aid into the water sample of the sludge gravity thickening tank. The hyaluronic acid concentrations in the water samples of the sludge gravity thickening tank are 0.6 mg / L respectively. Measure the changes in its sludge moisture content and sludge specific resistance, and observe the change of the height of the water - sludge separation interface of the water sample with the increase of the dosing time to reflect the thickening effect of the sludge.

[0125] The turbidity of the treated water sample from the sludge drainage tank is 11 NTU, and the reduction rate is 45%. The COD of the treated water sample from the sludge drainage tank is 121 mg / L, and the reduction rate is 71.19%.

[0126] The sludge moisture content of the treated water sample from the sludge thickening tank is 59.8%, and the reduction rate is 38.49%. The sludge specific resistance value of the treated water sample from the sludge thickening tank is 2.21×10 9 s 2 / g, and the reduction rate is 36.63%. After being treated with this agent, its water - sludge separation interface drops from 500 mm to 457 mm within 20 min, and the reduction rate is 8.6%, and it continuously decreases with the increase of time. The water sample is obviously stratified and the supernatant is clear. The sludge is relatively compact, the flocs increase, the sludge sedimentation performance is good, and the sludge dewatering efficiency is high.

[0127] Example 15

[0128] In this experiment, 0.04 g of hyaluronic acid powder and 0.02 g of biochar powder are compound - added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the configured polymer composite coagulant aid is 0.4 g / L.

[0129] Put 1 L of the water sample from the sludge drainage tank into a six - stirrer, add 1 mL of the polymer composite coagulant aid into the water sample of the sludge drainage tank. The hyaluronic acid concentrations in the water samples of the sludge drainage tank are 0.4 mg / L respectively. After stirring, let it stand for 30 min. Take the supernatant of the treated water sample to measure a series of water quality indicators such as turbidity and COD, and analyze the influence of the coagulant aid on the flocculation and precipitation effect of the sludge drainage water and the optimal dosing concentration.

[0130] Put a 1-L sludge gravity thickening tank into a six-stirrer, add 1 mL of the polymer composite coagulant aid into the water sample in the sludge gravity thickening tank, and the hyaluronic acid concentration in the water sample of the sludge gravity thickening tank is 0.4 mg / L respectively. Measure the changes in its sludge moisture content and sludge specific resistance, and observe the change in the height of the muddy water separation interface in the water sample with the increase of the dosing time to reflect the thickening effect of the sludge.

[0131] The turbidity of the treated sludge discharge tank water sample is 11 NTU, and the reduction rate is 45%. The COD of the treated sludge discharge tank water sample is 136 mg / L, and the reduction rate is 67.61%.

[0132] The sludge moisture content of the treated sludge thickening tank water sample is 60%, and the reduction rate is 38.28%. The sludge specific resistance value of the treated sludge thickening tank water sample is 2.39×10 9 s 2 / g, and the reduction rate is 31.12%. After being treated with this agent, the muddy water separation interface drops from 500 mm to 460 mm within 20 minutes, and the reduction rate is 8%. It continuously decreases with the increase of time. The water sample is clearly stratified and the supernatant is clear. The sludge is relatively compact, the flocs increase, the sludge sedimentation performance is good, and the sludge dewatering efficiency is high.

[0133] Comparative Example 1

[0134] Compared with Example 1, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 1.

[0135] The data measured from the supernatant are as follows: the turbidity is 1.1 NTU, and the removal rate is 77.41%; the UV is 0.071, and the removal rate is 28.28%; the TOC is 2.56 mg / L, and the removal rate is 34.35%.

[0136] The effects of Example 1, raw water, Comparative Example 1, and separate PAC treatment are compared as Figure 2 shown. The method of separate PAC treatment is the same as that of Example 1, except that no coagulant aid is applied. Through Figure 2 it can be obtained that the coagulant aid of this application has a better cooperative effect with PAC compared with PAM.

[0137] Comparative Example 2

[0138] Compared with Example 2, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 2.

[0139] The data measured from the supernatant are as follows: the turbidity is 1.23 NTU, and the removal rate is 74.74%; the UV is 0.071, and the removal rate is 28.28%; the TOC is 2.66 mg / L, and the removal rate is 31.79%.

[0140] Comparative Example 3

[0141] Compared with Example 3, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 3.

[0142] The data obtained by measuring the supernatant are as follows: the turbidity is 1.12 NTU, and the removal rate is 77%; the UV is 0.074, and the removal rate is 25.25%; the TOC is 2.68 mg / L, and the removal rate is 31.28%.

[0143] Comparative Example 4

[0144] Compared with Example 4, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 4.

[0145] The data obtained by measuring the supernatant are as follows: the turbidity is 1.21 NTU, and the removal rate is 75.15%; the UV is 0.074, and the removal rate is 25.25%; the TOC is 2.78 mg / L, and the removal rate is 28.71%.

[0146] Comparative Example 5

[0147] Compared with Example 5, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 5.

[0148] The data obtained by measuring the supernatant are as follows: the turbidity is 1.01 NTU, and the removal rate is 79.26%; the UV is 0.074, and the removal rate is 25.25%; the TOC is 2.81 mg / L, and the removal rate is 27.94%.

[0149] Comparative Example 6

[0150] Compared with Example 6, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 6.

[0151] The data obtained by measuring the supernatant are as follows: the turbidity is 1.31 NTU, and the removal rate is 73.1%; the UV is 0.074, and the removal rate is 25.25%; the TOC is 2.96 mg / L, and the removal rate is 24.1%.

[0152] Comparative Example 7

[0153] Compared with Example 7, the coagulant aid used is PAM (polyacrylamide) with the same concentration, and the others are the same as in Example 7.

[0154] The data obtained by measuring the supernatant are as follows: the turbidity is 1.52 NTU, and the removal rate is 68.78%; the UV is 0.074, and the removal rate is 25.25%; the TOC is 3.10 mg / L, and the removal rate is 20.51%.

[0155] Comparative Examples 1-7 correspond to Examples 1-7 respectively. By comparison, it can be obtained that under the same conditions, the treatment effect of the PAC + coagulant aid in the present application is better than that of PAC + PAM.

[0156] Comparative Example 8

[0157] Compared with Example 11, the coagulant aid used is an aqueous solution of coagulant aid PAM (polyacrylamide) with the same concentration. Other conditions are the same as in Example 11. The concentration of coagulant aid PAM in the sewage is 2 mg / L. After coagulant aid stirring, the supernatant is taken for index detection after 30 minutes of the water sample in the sludge discharge tank. It is obtained that the turbidity is 12 NTU, the reduction rate is 40%, the COD is 136 mg / L, and the reduction rate is 67.61%. After the PAM coagulant aid is put into the water sample in the sludge thickening tank and treated, the sludge moisture content is 67%, the reduction rate is 38.49%, the sludge specific resistance is 2.59×10 9 s 2 / g, the reduction rate is 25.36%. After being treated with this agent, the mud-water separation interface drops from 500 mm to 450 mm within 20 minutes, the reduction rate is 10%, and it continuously decreases with the increase of time. The water sample is obviously stratified and the supernatant is clear. The flocs are larger, the sludge sedimentation performance is good, and the sludge dewatering efficiency is average.

[0158] Figure 3 shows Example 11 (corresponding to Figure 2 the coagulant aid therein), Comparative Example 8 (corresponding to Figure 2 PAM- therein, anionic), the original sludge water sample (without adding coagulant), adding PAC alone (corresponding to Figure 2 PAC therein), PAM cationic (corresponding to Figure 2 PAM+ therein) of the treated sludge moisture content. The treatment method of PAM cationic is the same as that of Comparative Example 8, only replacing PAM anionic with PAM cationic. The treatment method of adding PAC alone is the same as that of Comparative Example 8, only without adding PAM. Through Figure 3 it can be obtained that after the coagulant aid of the present application is used to treat the sludge water sample, the reduction rate of the sludge moisture content is higher.

[0159] Comparative Example 9

[0160] Compared with Example 12, the coagulant aid used is an aqueous solution of PAM (polyacrylamide) with the same concentration. Other conditions are the same as in Example 12. The concentration of PAM as the coagulant aid in the sewage is 1 mg / L. After coagulation stirring, the supernatant is taken from the water sample in the sludge discharge tank after 30 minutes for index detection. The turbidity is 12 NTU, and the reduction rate is 40%. The COD is 156 mg / L, and the reduction rate is 62.85%. After adding the PAM coagulant aid into the water sample in the sludge thickening tank and conducting treatment, the sludge moisture content is 67.5%, and the reduction rate is 37.25%. The sludge specific resistance is 2.6×10 9 s 2 / g, and the reduction rate is 25.07%. After treatment with this agent, the mud-water separation interface drops from 500 mm to 460 mm within 20 minutes, with a reduction rate of 8%, and continuously decreases with the increase of time. The water sample is obviously stratified and the supernatant is clear. The flocs are relatively large, the sludge sedimentation performance is good, and the sludge dewatering efficiency is average.

[0161] Comparative Example 10

[0162] Compared with Example 13, the coagulant aid used is an aqueous solution of PAM (polyacrylamide) with the same concentration. Other conditions are the same as in Example 13. The concentration of PAM as the coagulant aid in the sewage is 0.8 mg / L. After coagulation stirring, the supernatant is taken from the water sample in the sludge discharge tank after 30 minutes for index detection. The turbidity is 14 NTU, and the reduction rate is 30%. The COD is 160 mg / L, and the reduction rate is 61.9%. After adding the PAM coagulant aid into the water sample in the sludge thickening tank and conducting treatment, the sludge moisture content is 68%, and the reduction rate is 33.14%. The sludge specific resistance is 2.61×10 9 s 2 / g, and the reduction rate is 25.1%. After treatment with this agent, the mud-water separation interface drops from 500 mm to 480 mm within 20 minutes, with a reduction rate of 4%, and continuously decreases with the increase of time. The water sample is obviously stratified and the supernatant is relatively clear. The flocs are relatively small, and the sludge sedimentation performance is average.

[0163] It can be seen from the examples and comparative examples that the high-molecular composite coagulant aid hyaluronic acid of the present application, at a certain pH value and temperature, utilizes its extremely strong viscosity and adsorption to accelerate the flocculation and sedimentation process of some insoluble and difficult-to-settle solids and colloids, thereby improving the coagulation efficiency. The removal effect on the turbidity of the water body is the most obvious. In sludge dewatering, the coagulation effect of the coagulant aid of the present application is good, the formed flocs are large, have high strength, are not easy to break, do not increase the mud cake amount, and are non-corrosive, thereby improving the sludge dewatering efficiency. Compared with PAM, this coagulant aid has certain advantages in water treatment indexes, has relatively high sludge dewatering efficiency, is more environmentally friendly, and is safer for the human body and the environment.

[0164] Experimental Example 1

[0165] The turbidity of the raw water is 3.81 NTU; the UV is 0.099; the TOC is 3.703.

[0166] The addition method of the experimental group is the same as that of Example 1, adding PAC + coagulant aid; and a control group is set up. The control group is PAFC (flocculant aluminum ferric chloride) + coagulant aid. The dosages of the flocculant and coagulant aid in the experimental group and the control group are the same, and the compositions of the coagulant aid in the experimental group and the control group are the same. As Figure 4 shown, the turbidity of the sewage treated by the control group is 1.17 NTU; the UV is 0.049; the TOC is 2.749. The turbidity of the sewage treated by the experimental group is 1.05 NTU; the UV is 0.047; the TOC is 2.365. Therefore, the cooperation effect of PAFC and coagulant aid is weaker than that of PAC and coagulant aid.

[0167] Experimental Example 2

[0168] The turbidity of the raw water is 4.03 NTU; the UV is 0.098; the TOC is 4.13.

[0169] The addition method of the experimental group is the same as that of Example 1, adding PAC + biochar + hyaluronic acid; and a control group is set up. The control group is PAC + activated carbon + hyaluronic acid. The dosages of the flocculant and coagulant aid in the experimental group and the control group are the same. The turbidity of the sewage treated by the control group is 1.26 NTU; the UV is 0.053; the TOC is 2.834. The turbidity of the sewage treated by the experimental group is 0.987 NTU; the UV is 0.053; the TOC is 2.638. As Figure 5 shown, it can be obtained that the effect of the coagulant aid composed of activated carbon and hyaluronic acid is lower than that of the coagulant aid composed of biochar and hyaluronic acid in this application, indicating that the cooperation effect of biochar and hyaluronic acid is better and more conducive to the formation of larger and more stable large particle precipitates.

[0170] Experimental Example 3

[0171] The turbidity of the raw water is 3.48 NTU; the UV is 0.068.

[0172] Control group 1, only adding PAC; Control group 2: only adding hyaluronic acid; Control group 3: adding PAC + hyaluronic acid (high molecular weight, 1 million to 1.3 million molecular level); Control group 4: adding PAC + PAM; Control group 5: adding PAC + hyaluronic acid (medium molecular weight, 200,000 to 500,000 molecular level); Control group 6: adding PAC + hyaluronic acid (low molecular weight, 30,000 to 50,000 molecular level). The amounts of PAC added in each control group are the same, and PAM is regarded as a coagulant aid. The amounts of the coagulant aid added in each control group are the same.

[0173] The treatment results are asFigure 6 As shown, the water treatment effect of the combination of high molecular weight hyaluronic acid and PAC is better than that of hyaluronic acid alone, PAC alone, medium molecular weight hyaluronic acid and PAC, and low molecular weight and PAC.

[0174] Experimental Example 4

[0175] Using the standard luminous bacteria of Photobacterium phosphoreum and the supporting kit, the toxicity of the coagulant aid and PAM (polyacrylamide) of the present application was detected. The supporting kit includes: resuscitation diluent, osmotic pressure regulating solution, and positive control solution. Detection was carried out using a water quality biotoxicity detector. The operation procedure was carried out according to the instruction manual of the water quality biotoxicity detector. The operation procedure includes:

[0176] Reagent preparation: The freeze-dried bacteria of Photobacterium phosphoreum were equilibrated at room temperature for 10 min; hydrated with the resuscitation diluent and the freeze-dried powder reagent of Photobacterium phosphoreum; pipetted the reagent; and the hydrated reagent was placed at room temperature for 15 min.

[0177] Blank preparation: Pure water and the osmotic pressure regulating solution were mixed in a ratio of 9:1; pipetted the reagent to obtain a blank control sample, that is, a non-toxic water sample.

[0178] Sample preparation: The sample to be tested and the osmotic pressure regulating solution were mixed in a ratio of 9:1; pipetted the reagent to mix it evenly; and placed test tubes A1 and A2 in positions A1 and A2 of the test tube rack.

[0179] Reaction of reagent and sample: Add 1 mL of the blank control sample after osmotic pressure regulation to tube A1, and add 1 mL of the sample after osmotic pressure regulation to tube A2; add 50 μL of the hydrated reagent to each of tubes A1 and A2 respectively, with a liquid addition interval of 20 s, and pipette and mix evenly with a 1 mL pipette; the reagent reacted for 15 min and 30 min respectively, starting from the moment when the reagent was added to tube A1.

[0180] Detect tubes A1 and A2 with a water quality biotoxicity detector to obtain the blank luminescence value corresponding to tube A1 and the reading of tube A2, and the instrument automatically gives the relative luminescence and RLU values of the sample.

[0181] The samples in the above tube A2 respectively included the aqueous solution of the coagulant aid of Example 1 of the present application and the aqueous solution of PAM. The concentration of hyaluronic acid in the aqueous solution of the coagulant aid was the same as the concentration of PAM in the aqueous solution of PAM, and multiple concentration groups were set. The concentrations of hyaluronic acid in the aqueous solution of the coagulant aid were 2 g / L, 3 g / L, 4 g / L, 5 g / L, 6 g / L, 7 g / L, and 8 g / L respectively. The results obtained were as Figure 7 shown, through Figure 7It can be seen that under different bacterial growth time conditions, the growth inhibition rate of PAM on bacteria is significantly higher than that of the coagulant aid agent of the present application.

[0182] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application having equivalent elements, modifications, omissions, combinations (e.g., schemes where various embodiments cross), adaptations, or alterations. The elements in the claims will be broadly interpreted based on the language employed in the claims and are not limited to the examples described in this specification or during the implementation of the present application, and the examples will be construed as non-exclusive. Thus, this specification and the examples are intended to be considered only as examples, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0183] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of their schemes) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. Additionally, in the above detailed description, various features can be grouped together to simplify the present application. This should not be construed as an intention that a feature of the application not claimed is necessary for any claim. On the contrary, the subject matter of the present application can be less than all the features of a particular embodiment of the application.

[0184] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A coagulation-aiding agent based on hyaluronic acid, characterized in that, The coagulant aid agent is composed of hyaluronic acid, biochar and water. The mass-volume ratio of hyaluronic acid, biochar and water is (0.2 - 2) g: 0.2 g: 1 L, and the molecular level of the hyaluronic acid solution is 1 million - 1.3 million molecular level.

2. The coagulant aid agent according to claim 1, characterized in that, The mass-volume ratio of hyaluronic acid, biochar and water is (1.4 - 2) g: 0.2 g: 1 L.

3. The preparation method of the coagulant aid agent according to claim 1 or 2, characterized in that, The coagulant aid agent is obtained by mixing the hyaluronic acid and biochar powders with water.

4. Application of the coagulant aid agent according to any one of claims 1 - 2 in sewage treatment.

5. A method for treating sewage containing organic carbon, characterized in that, The treatment method includes: adding a flocculant to the sewage first, then adding the coagulant aid described in any one of claims 1-2, stirring and then standing still, and separating the solid and liquid of the sewage after standing still to obtain the treated water. The sewage has a sludge specific resistance less than 1.2×10 9 s 2 / g, and the TOC in the sewage is greater than 3.5 mg / L.

6. The processing method according to claim 5, characterized in that, After adding the coagulant aid agent, the concentration of hyaluronic acid in the sewage is 0.2 - 2 mg / L.

7. The processing method according to claim 5, characterized in that, The flocculant is polyaluminum chloride; During the sewage treatment process, high-speed stirring, medium-speed stirring and slow-speed stirring are carried out in sequence; during the high-speed stirring state of the sewage, the flocculant is added, and the coagulant aid agent according to any one of claims 1 - 2 is added after the medium-speed stirring ends and before the slow-speed stirring. The rotation speed of the high-speed stirring is 230 - 300 r / min, and the time of the high-speed stirring is 20 - 40 s; the rotation speed of the medium-speed stirring is 160 - 210 r / min, and the time of the medium-speed stirring is 0.8 - 1.2 min; the rotation speed of the slow-speed stirring is 40 - 60 r / min, and the time of the slow-speed stirring is 8 - 12 min.

8. A method for treating sewage in a sludge thickening tank, characterized in that, The treatment method includes adding the coagulant aid agent described in any one of claims 1-2 to the sewage, stirring and then standing still. The sewage includes the sludge discharged from the reaction tank, and the sludge specific resistance value of the sewage is greater than 1×10 9 s 2 / g.

9. A method for treating sewage in a sludge thickening tank, characterized in that, The treatment method includes adding the coagulant aid described in any one of claims 1-2 to the sewage, stirring and then standing still. The sewage includes the sludge water discharged from the sedimentation tank, and the sludge specific resistance value of the sewage is greater than 1×10 9 s 2 / g.

10. A method for treating sewage in a sludge thickening tank, characterized in that, The treatment method includes adding the coagulant aid described in any one of claims 1-2 to the sewage, stirring and then standing still. The sewage includes backwashing wastewater of the filter, and the sludge specific resistance value of the sewage is greater than 1×10 9 s 2 / g.

11. The processing method according to any one of claims 8-10, characterized in that, The pH of the sewage is 6 - 9; the temperature of the sewage is 20 - 25 °C.

12. The processing method according to any one of claims 8-10, characterized in that, After the coagulant aid agent is added to the sewage, the concentration of hyaluronic acid in the sewage is 0.4 - 2 mg / L.

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