Coagulation aid agent based on hyaluronic acid, preparation method, application and sewage treatment method

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a coagulation aid agent based on hyaluronic acid, a preparation method, application and a sewage treatment method, the coagulation aid agent is composed of hyaluronic acid, biomass charcoal and water, the mass volume ratio of hyaluronic acid to biomass charcoal to water is (0.2-2) g: 0.2 g: 1L, and the molecular level of a hyaluronic acid solution is 100-130 million molecular level; therefore, the problems that toxic substances remain in water after the coagulant aid agent is used and secondary pollution is easily caused by synthesis can be solved, the coagulating sedimentation effect and the sludge sedimentation and dehydration efficiency can be improved, the defect that organic matters harmful to a human body are possibly generated after the traditional coagulant aid agent PAM is used for treating a water body is overcome, and the coagulant aid agent is more environment-friendly.

Description

Technical Field

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

[0002] At present, water plants mostly use the conventional coagulation-sedimentation-filtration-disinfection process. The quality of enhanced coagulation to remove algae and organic matter is often affected by factors such as water quality, water temperature, type of coagulant and its dosage. Coagulant is the focus of coagulation water treatment technology. Coagulant is used to adjust or improve coagulation conditions, promote coagulation, or is a high-molecular substance added to improve the structure of floccules. Therefore, the research and development of a new coagulant is of great significance in water treatment.

[0003] At present, the traditional coagulant aids available on the market are mainly polyacrylamide (PAM). It is widely used in coagulation and sedimentation and sludge dewatering. When used in sludge dewatering, its dosage is difficult to control. When the dosage reaches a certain value, the sludge flocs no longer grow. If the dosage is further increased, not only will the flocs fail to form, but the sludge will become turbid and the sludge will be poorly formed, affecting the sludge dewatering efficiency. Polyacrylamide also has a fatal disadvantage, that is, it has certain biological toxicity, and its toxicity comes from some organic substances in its ingredients. Due to its toxicity, there is still a certain amount of residue in the water after polyacrylamide treatment, which will bring certain 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 hyaluronic acid-based coagulant, preparation method, application and sewage treatment method are needed to solve the problem of residual toxic substances in water after the use of the coagulant and the problem of secondary pollution caused by synthesis, and to improve the effect of coagulation and sedimentation and the efficiency of sludge sedimentation and dehydration.

[0005] In the first aspect of the present application, a coagulant agent based on hyaluronic acid is provided, which is composed of hyaluronic acid, biochar and water. The mass volume ratio of the 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 to 1.3 million molecules.

[0006] The second aspect of the present application provides an application of the coagulant aid described in any embodiment of the present application in sewage treatment.

[0007] The third aspect of the present application provides a method for preparing the coagulant agent described in any embodiment of the present application, wherein the hyaluronic acid and biomass powder are mixed with water to obtain the coagulant agent.

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

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

[0010] The embodiments of the present application provide a hyaluronic acid-based coagulant, preparation method, application and sewage treatment method. The coagulant includes hyaluronic acid and biochar. Both hyaluronic acid and biochar are non-toxic substances. The treated water is non-toxic and harmless to the human body and has no adverse effects on the environment. The hyaluronic acid and biochar cooperate with each other, which can not only improve the adsorption and viscosity, but also make the small particles in the sewage aggregate into larger and more stable large particles, so that the solid suspended matter gathered in the water can be quickly settled, thereby improving its coagulation and sedimentation effect. For sludge sewage, the coagulation effect is good, the flocs formed are large, the strength is high, they are not easy to break, the amount of mud cake is not increased, and they are non-corrosive, thereby better improving the efficiency of sludge dewatering, and can 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 parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments applied for. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0012] Figure 1 A schematic diagram showing the adsorption treatment of the coagulant aid according to the experimental example of the present application is shown; Figure 2 A comparison diagram of sewage treatment according to different embodiments of the present application is shown; Figure 3A comparison diagram of sludge moisture content according to different embodiments of the present application is shown; Figure 4 A comparison chart of the treatment effects of different flocculants according to the present application is shown; Figure 5 A comparison chart of the treatment effects of biochar and activated carbon according to the present application is shown; Figure 6 A comparison chart showing the treatment effects of different hyaluronic acid molecular weights according to the present application is shown; Figure 7 A comparison chart showing the inhibition rate of Photobacterium luminescens growth by different coagulants according to the present application is shown. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific implementation examples. The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation examples, but are not intended to limit the present application.

[0014] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0015] According to an embodiment of the present application, a hyaluronic acid-based coagulant is provided, which includes hyaluronic acid, biochar and water. The mass volume ratio of the 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 to 1.3 million molecules.

[0016] Figure 1 The microscopic diagram of the coagulation adsorption of the coagulant in water is shown in the figure. In the present application, hyaluronic acid and biochar are selected to form the coagulant, and the crystal nucleus adsorption performance of the biochar is utilized, and hyaluronic acid is used to improve the adsorption capacity of the biochar, so that the coagulant has extremely strong adsorption and viscosity, making the water phase change viscous, prompting the formed small particles to precipitate and aggregate into larger and more stable large particles, so that the solid suspended matter gathered in the water is quickly settled, and the coagulation and sedimentation effect is improved. The coagulant of the present application can also increase the contact area between sludge particles, especially the contact between large particles and small particles, improve the efficiency of sludge contact with water, and thus improve the efficiency of sludge dehydration.

[0017] In addition, hyaluronic acid and biochar have a better combination effect than hyaluronic acid and activated carbon. Although activated carbon has a better adsorption effect, it is found in this application that the combination of biochar and hyaluronic acid has a better coagulant effect in sewage.

[0018] The water treated with the coagulant aid of the present application is non-toxic and harmless to the human body and has no adverse effects on the environment, which makes up for the defect that the traditional coagulant aid PAM (polyacrylamide) may produce organic matter harmful to the human body after treating the water body, and is more green and environmentally friendly.

[0019] In some embodiments, the mass volume ratio of hyaluronic acid, biochar and water is (1.4-2) g:0.2 g:1L.

[0020] According to an embodiment of the present application, a method for preparing the coagulant aid described in any embodiment of the present application is also provided, and the coagulant aid is obtained by mixing the hyaluronic acid and biomass powder with water.

[0021] According to an embodiment of the present application, there is also provided an application of the coagulant aid described in any embodiment of the present application in sewage treatment.

[0022] According to an embodiment of the present application, a method for treating organic carbon-containing wastewater is provided, the method comprising: first adding a flocculant to the wastewater, then adding a coagulant aid as described in any embodiment of the present application, stirring and then standing the wastewater, and performing solid-liquid separation on the wastewater after standing to obtain treated water, wherein the wastewater has a sludge specific resistance of less than 1.2×10 9 s 2 / g of sewage, and the TOC in the sewage is greater than 3.5mg / L.

[0023] The coagulant aid of the present application can enhance the effect of flocculants (such as PAC, etc.), help form a harder and more durable sludge floc structure, and has a significant effect on reducing water quality indicators such as turbidity, TOC, UV, COD, etc. in water.

[0024] In some embodiments, after the coagulant is added, the concentration of hyaluronic acid in the coagulant in the sewage is 0.2-2 mg / L. Preferably, after the coagulant is added, the concentration of hyaluronic acid in the coagulant in the sewage is 1.4-2 mg / L.

[0025] In some embodiments, the flocculant is polyaluminium chloride. Compared with other flocculants, the coagulant aid of the present application and polyaluminium chloride can better remove small particles in sewage.

[0026] In some embodiments, high-speed stirring, medium-speed stirring and slow-speed stirring are performed in sequence during sewage treatment; flocculants are added during high-speed stirring of sewage, and the coagulant aid described in any embodiment of the present application is added after the medium-speed stirring is completed and before the slow stirring. If the flocculant is added after the slow stirring, a good flocculation effect cannot be achieved.

[0027] In some embodiments, the high-speed stirring speed is 230~300 r / min, and the high-speed stirring time is 20~40s; the medium-speed stirring speed is 160~210 r / min, and the medium-speed stirring time is 0.8~1.2min; the low-speed stirring speed is 40~60 r / min, and the low-speed stirring time is 8~12min.

[0028] According to an embodiment of the present application, a method for treating sewage from a sludge thickening tank is provided. The method comprises adding the coagulant aid described in any embodiment of the present application to the sewage, stirring and then standing the sewage, wherein the sewage comprises sludge water discharged from a reaction tank, sludge water discharged from a sedimentation tank and / or backwash wastewater from a filter tank, and the sludge specific resistance value of the sewage is greater than (1-3)×10 9 s 2 / g.

[0029] In some embodiments, the pH of the sewage is 6-9; the temperature of the sewage is 20-25°C. The temperature of the reaction system in all the above steps is preferably maintained at 20-25°C. The present application controls the temperature of the reaction system within the above range, which can not only ensure a high precipitation rate, but also avoid increasing the solubility of insoluble solids under low or high temperature conditions, thereby achieving a better removal effect. The sewage can be adjusted to a pH of 6-9 by adding acid-base reagents.

[0030] In some embodiments, after the coagulant is added to the sewage, the concentration of hyaluronic acid in the sewage is 0.4-2 mg / L. Preferably, after the coagulant is added to the sewage, the concentration of hyaluronic acid in the sewage is 1-2 mg / L.

[0031] The sewage in Examples 1 to 10 and Comparative Examples 1 to 7 is effluent from a sewage treatment plant in Shandong Province, and the instrument used is a six-stage mixer.

[0032] In Example 1 to Example 15, the preparation method of the polymer composite coagulant agent includes: putting hyaluronic acid powder and biomass powder charcoal into a beaker, adding water to dissolve, stirring with a magnetic stirrer or a glass rod until completely dissolved, then sealing with tin foil and leaving it to stand at low temperature for 24 hours before use, to obtain a polymer composite coagulant agent.

[0033] Example 1 In this experiment, 0.2 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 2 g / L.

[0034] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0035] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow-speed stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 2mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0036] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0037] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.786NTU, and the removal rate was 83.86%; UV was 0.068, and the removal rate was 31.31%; TOC was 2.47mg / L, and the removal rate was 36.67%.

[0038] Example 2 In this experiment, 0.16 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 1.6 g / L.

[0039] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0040] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 1.6mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0041] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0042] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.832NTU, and the removal rate was 82.91%; UV was 0.069, and the removal rate was 30.3%; TOC was 2.53mg / L, and the removal rate was 35.13%.

[0043] Example 3 In this experiment, 0.14 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 1.4 g / L.

[0044] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0045] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 1.4mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0046] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0047] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.886NTU, and the removal rate was 81.8%; UV was 0.070, and the removal rate was 29.29%; TOC was 2.59mg / L, and the removal rate was 33.59%.

[0048] Example 4 In this experiment, 0.12 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 1.2 g / L.

[0049] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0050] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 1.2mg / L. After the stirring was completed, it was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0051] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0052] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.932NTU, and the removal rate was 80.86%; UV was 0.071, and the removal rate was 28.28%; TOC was 2.87mg / L, and the removal rate was 26.41%.

[0053] Example 5 In this experiment, 0.1 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water to prepare a high molecular weight composite coagulant agent with a hyaluronic acid solution concentration of 1 g / L.

[0054] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0055] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of hyaluronic acid in the sewage was 1mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0056] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0057] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 1.12NTU, and the removal rate was 77%; UV was 0.073, and the removal rate was 26.26%; TOC was 2.93mg / L, and the removal rate was 24.87%.

[0058] Example 6 In this experiment, 0.08 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.8 g / L.

[0059] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0060] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 0.8mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

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

[0062] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.96NTU, and the removal rate was 80.28%; UV was 0.073, and the removal rate was 26.26%; TOC was 2.94mg / L, and the removal rate was 24.61%.

[0063] Example 7 In this experiment, 0.06 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water to prepare a high molecular weight composite coagulant agent with a hyaluronic acid solution concentration of 0.6 g / L.

[0064] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0065] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 0.6mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0066] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0067] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 0.98NTU, and the removal rate was 79.87%; UV was 0.072, and the removal rate was 27.27%; TOC was 3.1mg / L, and the removal rate was 20.51%.

[0068] Example 8 In this experiment, 0.04 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.4 g / L.

[0069] The concentration of the flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0070] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 0.4mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0071] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0072] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 1.1NTU, and the removal rate was 77.41%; UV was 0.072, and the removal rate was 27.27%; TOC was 3.08mg / L, and the removal rate was 21.02%.

[0073] Example 9 In this experiment, 0.03 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water to prepare a high molecular weight composite coagulant with a hyaluronic acid concentration of 0.3 g / L.

[0074] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0075] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 0.3mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0076] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0077] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 1.21NTU, and the removal rate was 75.15%; UV was 0.071, and the removal rate was 28.28%; TOC was 3.06mg / L, and the removal rate was 21.54%.

[0078] Example 10 In this experiment, 0.02 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.2 g / L.

[0079] The concentration of the prepared flocculant PAC (polyaluminium chloride) aqueous solution is 40 g / L.

[0080] 1L of sewage was placed in a six-stage mixer. The order of adding reagents was as follows: 1mL of the prepared flocculant PAC aqueous solution was added before high-speed stirring, and 1mL of the polymer composite coagulant was added after the medium-speed stirring and before the slow-speed stirring. The concentration of the flocculant PAC in the sewage was 40mg / L, and the concentration of the hyaluronic acid in the sewage was 0.2mg / L. After the stirring was completed, the mixture was allowed to stand for 30 minutes, and the supernatant was taken to measure a series of water quality indicators such as turbidity, UV, and TOC.

[0081] The water quality indicators of the raw water sample are: turbidity is 4.87NTU, UV is 0.099, and TOC is 3.9mg / L.

[0082] Through the above method, after coagulation and stirring treatment on a six-stage mixer, the supernatant was taken for measurement after standing for 30 minutes. The data were: turbidity was 1.31NTU, and the removal rate was 73.1%; UV was 0.076, and the removal rate was 23.238%; TOC was 2.99mg / L, and the removal rate was 23.33%.

[0083] The sludge dewatering examples of Examples 11 to 15 and Comparative Examples 8-10 were tested using sludge from a sludge pool of a sewage treatment plant in Shandong Province. The sludge dewatering process of this water plant requires that the sludge first enter the sludge discharge pool and then be discharged into the sludge thickening tank for sludge thickening and dewatering, and then to the sludge filter press for the transportation of dry sludge to meet the sludge treatment standards.

[0084] The original sludge has a high content of organic matter, is easy to rot and stink, has fine particles, high water content, and low specific gravity. After concentration or digestion, the sludge has a large volume and poor sedimentation performance, making it difficult to dehydrate the sludge.

[0085] The sludge dehydration experiments of Examples 11-15 and Comparative Examples 8-10 were conducted by taking 1000 ml of water from the sludge pool and sludge concentration pool of the water plant. The indicators of the original sludge water sample were determined as follows: the water content was 97.22%, and the sludge specific resistance value was 3.47×10 9 s 2 / g, the original sludge filtrate turbidity is 20NTU, the sludge filtrate COD is 420mg / L, and the initial mud-water separation interface is 500mm.

[0086] Embodiment 11 In this experiment, 0.2 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 2 g / L.

[0087] 1L of sludge pool water sample was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the sludge pool water sample. The hyaluronic acid concentration in the sludge pool water sample was 2mg / L. After stirring, the sample was left to stand for 30 minutes. The supernatant of the treated water sample was taken to measure a series of water quality indicators such as turbidity and COD, and the effect of the coagulant on the flocculation and sedimentation effect of sludge water and the optimal addition concentration was analyzed.

[0088] 1L sludge gravity thickening tank was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the water sample of the sludge gravity thickening tank. The hyaluronic acid concentration in the water sample of the sludge gravity thickening tank was 2mg / L. The changes in the sludge moisture content and sludge specific resistance were measured, and the changes in the mud-water separation interface height of the water sample with the increase of the addition time were observed to reflect the sludge concentration effect.

[0089] The turbidity of the sludge pool water sample after treatment was 8NTU, with a reduction rate of 60%. The COD of the sludge pool water sample after treatment was 92mg / L, with a reduction rate of 78%.

[0090] The sludge moisture content of the treated sludge thickening tank water sample was 59.8%, the reduction rate was 38.49%, and the sludge specific resistance value of the treated sludge thickening tank water sample was 1.97×10 9 s 2 / g, the reduction rate is 43.22%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 440mm within 20min, with a reduction rate of 12%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear, the flocs were enlarged, the sludge was relatively compact, the sludge sedimentation performance was better, and the sludge dewatering efficiency was high.

[0091] Example 12 In this experiment, 0.1 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water to prepare a high molecular weight composite coagulant agent with a hyaluronic acid solution concentration of 1 g / L.

[0092] 1L of sludge pool water sample was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the sludge pool water sample. The hyaluronic acid concentration in the sludge pool water sample was 1mg / L. After stirring, the sample was left to stand for 30 minutes. The supernatant of the treated water sample was taken to measure a series of water quality indicators such as turbidity and COD, and the effect of the coagulant on the flocculation and sedimentation effect of sludge water and the optimal addition concentration was analyzed.

[0093] 1L sludge gravity thickening tank was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the water sample of the sludge gravity thickening tank. The hyaluronic acid concentration in the water sample of the sludge gravity thickening tank was 1mg / L. The changes in the sludge moisture content and sludge specific resistance were measured, and the changes in the mud-water separation interface height of the water sample with the increase of the addition time were observed to reflect the sludge concentration effect.

[0094] The turbidity of the treated sludge pool water sample was 9NTU, with a reduction rate of 55%. The COD of the treated sludge pool water sample was 98mg / L, with a reduction rate of 76.67%.

[0095] The sludge moisture content of the treated sludge thickening tank water sample was 59.9%, the reduction rate was 39.31%, and the sludge specific resistance value of the treated sludge thickening tank water sample was 2.01×10 9 s 2 / g, the reduction rate is 42.07%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 450mm within 20min, with a reduction rate of 10%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear, the flocs were enlarged, the sludge was relatively compact, the sludge settling performance was better, and the sludge dewatering efficiency was higher.

[0096] Example 13 In this experiment, 0.08 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.8 g / L.

[0097] 1L of sludge pool water sample was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the sludge pool water sample. The hyaluronic acid concentration in the sludge pool water sample was 0.8mg / L. After stirring, the sample was left to stand for 30 minutes. The supernatant of the treated water sample was taken to measure a series of water quality indicators such as turbidity and COD, and the effect of the coagulant on the flocculation and sedimentation effect of sludge water and the optimal addition concentration was analyzed.

[0098] 1mL of sludge gravity concentrator was placed in a six-stage mixer, and 0.1mL of polymer composite coagulant was added to the water sample of the sludge gravity concentrator. The hyaluronic acid concentration in the water sample of the sludge gravity concentrator was 0.8mg / L. The changes in the sludge moisture content and sludge specific resistance were measured, and the changes in the mud-water separation interface height of the water sample with the increase of the addition time were observed to reflect the sludge concentration effect.

[0099] The turbidity of the sludge pool water sample after treatment was 10NTU, with a reduction rate of 50%. The COD of the sludge pool water sample after treatment was 101mg / L, with a reduction rate of 75.59%.

[0100] The sludge moisture content of the treated sludge thickening tank water sample was 59.5%, the reduction rate was 38.79%, and the sludge specific resistance value of the treated sludge thickening tank water sample was 2.31×10 9 s 2 / g, the reduction rate is 33.42%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 455mm within 20min, with a reduction rate of 9%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear. The sludge was relatively compact, the flocs were enlarged, the sludge settling performance was better, and the sludge dewatering efficiency was higher.

[0101] Embodiment 14 In this experiment, 0.06 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.6 g / L.

[0102] 1L of sludge pool water sample was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the sludge pool water sample. The hyaluronic acid concentration in the sludge pool water sample was 0.6mg / L. After stirring, the sample was left to stand for 30 minutes. The supernatant of the treated water sample was taken to measure a series of water quality indicators such as turbidity and COD, and the effect of the coagulant on the flocculation and sedimentation effect of sludge water and the optimal addition concentration was analyzed.

[0103] 1L sludge gravity thickening tank was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the water sample of the sludge gravity thickening tank. The hyaluronic acid concentration in the water sample of the sludge gravity thickening tank was 0.6mg / L. The changes in the sludge moisture content and sludge specific resistance were measured, and the changes in the mud-water separation interface height of the water sample with the increase of the addition time were observed to reflect the sludge concentration effect.

[0104] The turbidity of the sludge pool water sample after treatment was 11NTU, with a reduction rate of 45%. The COD of the sludge pool water sample after treatment was 121mg / L, with a reduction rate of 71.19%.

[0105] The sludge moisture content of the treated sludge thickening tank water sample was 59.8%, the reduction rate was 38.49%, and the sludge specific resistance value of the treated sludge thickening tank water sample was 2.21×10 9 s 2 / g, the reduction rate is 36.63%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 457mm within 20min, with a reduction rate of 8.6%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear. The sludge was relatively compact, the flocs were enlarged, the sludge settling performance was better, and the sludge dewatering efficiency was higher.

[0106] Embodiment 15 In this experiment, 0.04 g of hyaluronic acid powder and 0.02 g of biochar powder were added to 100 ml of ultrapure water, and the concentration of the hyaluronic acid solution in the prepared polymer composite coagulant was 0.4 g / L.

[0107] 1L of sludge pool water sample was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the sludge pool water sample. The hyaluronic acid concentration in the sludge pool water sample was 0.4mg / L. After stirring, the sample was left to stand for 30 minutes. The supernatant of the treated water sample was taken to measure a series of water quality indicators such as turbidity and COD, and the effect of the coagulant on the flocculation and sedimentation effect of sludge water and the optimal addition concentration was analyzed.

[0108] 1L sludge gravity thickening tank was placed in a six-stage mixer, and 1mL of polymer composite coagulant was added to the water sample of the sludge gravity thickening tank. The hyaluronic acid concentration in the water sample of the sludge gravity thickening tank was 0.4mg / L. The changes in the sludge moisture content and sludge specific resistance were measured, and the changes in the mud-water separation interface height of the water sample with the increase of the addition time were observed to reflect the sludge concentration effect.

[0109] The turbidity of the sludge pool water sample after treatment was 11NTU, with a reduction rate of 45%. The COD of the sludge pool water sample after treatment was 136mg / L, with a reduction rate of 67.61%.

[0110] The sludge moisture content of the treated sludge thickening tank water sample was 60%, the reduction rate was 38.28%, and the sludge specific resistance value of the treated sludge thickening tank water sample was 2.39×10 9 s 2 / g, the reduction rate is 31.12%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 460mm within 20min, with a reduction rate of 8%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear. The sludge was relatively compact, the flocs were enlarged, the sludge settling performance was better, and the sludge dewatering efficiency was higher.

[0111] Comparative Example 1 Compared with Example 1, the coagulant aid uses PAM (polyacrylamide) with the same concentration, and the rest is the same as Example 1.

[0112] The data measured on the supernatant were: turbidity was 1.1 NTU, removal rate was 77.41%; UV was 0.071, removal rate was 28.28%; TOC was 2.56 mg / L, removal rate was 34.35%.

[0113] Comparison of the effects of Example 1, raw water, Comparative Example 1 and PAC treatment alone Figure 2 The method of PAC treatment alone is the same as that in Example 1, except that no coagulant aid is applied. Figure 2 It can be concluded that the coagulant aid of the present application has a better coordination effect with PAC than PAM.

[0114] Comparative Example 2 Compared with Example 2, the coagulant aid uses PAM (polyacrylamide) with the same concentration, and the rest is the same as Example 2.

[0115] The data measured on the supernatant were: turbidity was 1.23 NTU, removal rate was 74.74%; UV was 0.071, removal rate was 28.28%; TOC was 2.66 mg / L, removal rate was 31.79%.

[0116] Comparative Example 3 Compared with Example 3, the coagulant aid uses PAM (polyacrylamide) with the same concentration, and the rest is the same as Example 3.

[0117] The data measured on the supernatant were: turbidity was 1.12 NTU, with a removal rate of 77%; UV was 0.074, with a removal rate of 25.25%; TOC was 2.68 mg / L, with a removal rate of 31.28%.

[0118] Comparative Example 4 Compared with Example 4, the coagulant aid uses PAM (polyacrylamide) with the same concentration, and the rest is the same as Example 4.

[0119] The data measured on the supernatant were: turbidity was 1.21 NTU, removal rate was 75.15%; UV was 0.074, removal rate was 25.25%; TOC was 2.78 mg / L, removal rate was 28.71%.

[0120] Comparative Example 5 Compared with Example 5, the coagulant aid uses PAM (polyacrylamide) with the same concentration, and the rest is the same as Example 5.

[0121] 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%.

[0122] Comparative Example 6 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.

[0123] 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%.

[0124] Comparative Example 7 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.

[0125] 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%.

[0126] 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 this application is better than that of PAC + PAM.

[0127] Comparative Example 8 Compared with Example 11, the coagulant aid used is an aqueous solution of PAM (polyacrylamide) with the same concentration as the coagulant aid, and the others are the same as in Example 11. The concentration of PAM as the coagulant aid in the sewage is 2 mg / L. After coagulant aid stirring, the supernatant is taken for index detection 30 minutes after the water sample in the sludge drainage tank. It is obtained that the turbidity is 12 NTU, and 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 processed, the sludge moisture content is 67%, and the reduction rate is 38.49%; the sludge specific resistance is 2.59×10 9 s 2 / g, and the reduction rate is 25.36%. After being treated with this reagent, the mud-water separation interface drops from 500 mm to 450 mm within 20 minutes, and 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 better, and the sludge dewatering efficiency is average.

[0128] Figure 3 shows Example 11 (corresponding to Figure 2 the coagulant aid in Figure 2 PAM- in, anionic type), original sludge water sample (without coagulant), PAC alone (corresponding to Figure 2 PAC in), PAM cationic type (corresponding to Figure 2 The treatment method of PAM cationic type is the same as that of comparative example 8, except that PAM anionic type is replaced by PAM cationic type. The treatment method of adding PAC alone is the same as that of comparative example 8, except that PAM is not added. Figure 3 It can be obtained that after the sludge water sample is treated with the coagulant aid of the present application, the reduction rate of the sludge water content is higher.

[0129] Comparative Example 9 Compared with Example 12, the coagulant aid uses a coagulant aid PAM (polyacrylamide) aqueous solution of the same concentration, and the other is the same as Example 12. The concentration of the coagulant aid PAM in the sewage is 1 mg / L, and the coagulant aid is stirred. After 30 minutes, the supernatant of the sludge pool water sample is taken for index detection, and the turbidity is 12NTU, the reduction rate is 40%, and the COD is 156mg / L, the reduction rate is 62.85%. After the PAM coagulant aid is added to the sludge concentration tank water sample, the post-treatment index detection is carried out. The sludge water content is 67.5%, the reduction rate is 37.25%, and the sludge specific resistance is 2.6×10 9 s 2 / g, the reduction rate is 25.07%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 460mm within 20min, with a reduction rate of 8%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear, the flocs were larger, the sludge settling performance was better, and the sludge dewatering efficiency was average.

[0130] Comparative Example 10 Compared with Example 13, the coagulant aid uses a coagulant aid PAM (polyacrylamide) aqueous solution of the same concentration, and the other is the same as Example 13. The concentration of the coagulant aid PAM in the sewage is 0.8 mg / L, and the coagulant aid is stirred. After 30 minutes, the supernatant of the sludge pool water sample is taken for index detection, and the turbidity is 14NTU, the reduction rate is 30%, and the COD is 160mg / L, the reduction rate is 61.9%. After the PAM coagulant aid is added to the sludge concentration tank water sample, the post-treatment index detection is carried out, and the sludge water content is 68%, the reduction rate is 33.14%, and the sludge specific resistance is 2.61×10 9 s 2 / g, with a reduction rate of 25.1%. After being treated with this agent, the mud-water separation interface dropped from 500mm to 480mm within 20min, with a reduction rate of 4%, and it continued to decrease with time. The water sample was obviously stratified and the supernatant was clear, the flocs were relatively small, and the sludge settling performance was average.

[0131] It can be seen from the examples and comparative examples that the polymer composite coagulant hyaluronic acid of the present application accelerates the flocculation and sedimentation process of some insoluble and difficult to settle solids and colloids by using its extremely strong viscosity and adsorption at a certain pH value and temperature, thereby improving the efficiency of coagulation, and has the most obvious effect on the removal of water turbidity. In sludge dewatering, the coagulant of the present application has good coagulation effect, large flocs, high strength, not easy to break, no increase in mud cake volume, and no corrosion, thereby improving the efficiency of sludge dewatering. Compared with PAM, this coagulant has certain advantages in water treatment indicators, relatively high sludge dewatering efficiency, and is more green and environmentally friendly, safer for the human body and the environment.

[0132] Experimental Example 1 The turbidity of the raw water is 3.81NTU; UV is 0.099; TOC is 3.703.

[0133] The experimental group was added in the same manner as in Example 1, with PAC + coagulant added; and a control group was set up, with PAFC (flocculant aluminum ferric chloride) + coagulant added. The dosage of flocculant and coagulant added in the experimental group and the control group was the same, and the composition of coagulant added in the experimental group and the control group was the same. Figure 4 As shown in the figure, the turbidity of the sewage after treatment in the control group was 1.17NTU, UV was 0.049, and TOC was 2.749. The turbidity of the sewage after treatment in the experimental group was 1.05NTU, UV was 0.047, and TOC was 2.365. Therefore, the combined effect of PAFC and coagulant is weaker than that of PAC and coagulant.

[0134] Experimental Example 2 The turbidity of the raw water is 4.03NTU; UV is 0.098; TOC is 4.13.

[0135] The experimental group was added in the same manner as in Example 1, with PAC + biochar + hyaluronic acid added; and a control group was set up, with PAC + activated carbon + hyaluronic acid added, and the dosage of flocculants and coagulants in the experimental and control groups was the same. The turbidity of the sewage after treatment in the control group was 1.26 NTU; UV was 0.053; TOC was 2.834. The turbidity of the sewage after treatment in the experimental group was 0.987 NTU; UV was 0.053; TOC was 2.638. Figure 5 As shown, it can be obtained that the coagulant effect of the activated carbon and hyaluronic acid composition is lower than that of the coagulant effect of the biochar and hyaluronic acid composition of the present application, indicating that the combination effect of biochar and hyaluronic acid is better and more conducive to the formation of larger and more stable large-particle precipitates.

[0136] Experimental Example 3 The turbidity of the raw water is 3.48 NTU; UV is 0.068.

[0137] Control group 1: only PAC was added; Control group 2: only hyaluronic acid was added; Control group 3: PAC + hyaluronic acid (high molecular weight, 1 - 1.3 million molecular level) was added; Control group 4: PAC + PAM was added; Control group 5: PAC + hyaluronic acid (medium molecular weight, 0.2 - 0.5 million molecular level) was added; Control group 6: PAC + hyaluronic acid (low molecular weight, 0.03 - 0.05 million molecular level) was added. The amount of PAC added in each control group was the same. PAM was regarded as a coagulant aid, and the amount of coagulant aid added in each control group was the same.

[0138] The results after treatment are as Figure 6 shown. It can be obtained that the water treatment effect of the combination of high - molecular - weight hyaluronic acid and PAC is better than that of single hyaluronic acid, single PAC, medium - molecular - weight hyaluronic acid and PAC, and low - molecular - weight and PAC.

[0139] Experimental example 4 The toxicity of the coagulant aid of this application and PAM (polyacrylamide) was detected using the standard Photobacterium phosphoreum and the supporting kit. 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 process was carried out according to the instructions of the water quality biotoxicity detector. The operation process includes: 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.

[0140] 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.

[0141] 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; placed test tubes A1 and A2 in positions A1 and A2 of the test tube rack.

[0142] 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 well with a 1 mL pipette; the reagent reacts for 15 min and 30 min respectively, starting from the moment when the reagent is added to tube A1 for timing.

[0143] 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. The instrument automatically gives the relative luminescence and RLU values of the sample.

[0144] The samples in the above-mentioned A2 tube respectively include the coagulant aqueous solution and the PAM aqueous solution of Example 1 of the present application. The hyaluronic acid concentration in the coagulant aqueous solution is the same as the PAM concentration in the PAM aqueous solution. A plurality of concentration groups are set, and the hyaluronic acid concentrations in the coagulant aqueous solution are 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 are as follows: Figure 7 As shown, through Figure 7 It can be seen that under different bacterial growth time conditions, the bacterial growth inhibition rate of PAM is significantly higher than that of the coagulant aid of the present application.

[0145] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims are to be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the practice of this application, and the examples are to be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0146] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) may be used in combination with each other. For example, a person of ordinary skill in the art may use other embodiments when reading the above description. In addition, in the above specific embodiments, various features may be grouped together to simplify the application. This should not be interpreted as an intention that a feature of an application that is not claimed for protection is necessary for any claim. On the contrary, the subject matter of the present application may be less than all the features of the embodiments of a particular application.

[0147] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A coagulant agent based on hyaluronic acid, characterized in that: 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 to 1.3 million molecules.

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

3. The method for preparing the coagulant aid according to claim 1 or 2, characterized in that: The hyaluronic acid and biomass powder are mixed with water to obtain a coagulant aid.

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

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

6. The processing method according to claim 5, characterized in that: After adding the coagulant, the concentration of hyaluronic acid in the wastewater is 0.2~2 mg / L.

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

8. A method for treating sewage from a sludge thickening tank, characterized in that: The treatment method comprises adding the coagulant aid according to any one of claims 1 to 2 to sewage, stirring and then standing, wherein the sewage comprises sludge water discharged from a reaction tank, sludge water discharged from a sedimentation tank and / or backwash wastewater from a filter tank, and the sludge specific resistance of the sewage is greater than (1-3)×10 9 s 2 / g.

9. The processing method according to claim 8, characterized in that: The pH of the sewage is 6-9; the temperature of the sewage is 20-25°C.

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

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