A method for cleaning green algae from a sedimentation basin

Abstract

The present application relates to sewage treatment moss cleaning technical field, disclose a kind of sedimentation tank moss cleaning method, comprising the following steps: S1, pretreatment moss, by physical and chemical methods, moss is converted into state convenient to remove;S2, spray treatment, at temperature range is 20 ℃ to 30 ℃, using the water containing sodium hypochlorite is sprayed to moss;S3, ultraviolet irradiation, to the first moss obtained ultraviolet irradiation;S4, inhibit the growth of moss, to the second moss is post-processed to inhibit its growth;S5, clean waste, moss residues, cleaning agent and other waste generated in the cleaning process are cleaned in time, avoid the influence of residue on water quality, and prevent moss from growing again again.By physical and chemical combination mode, first, the loose moss in sedimentation tank is effectively removed, then the solution containing sodium hypochlorite is used to spray the moss, to ensure that each moss patch is evenly contacted, to achieve the ideal chemical cleaning effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sedimentation tank moss cleaning, in particular to a moss cleaning method for a sedimentation tank. BACKGROUND

[0002] The sedimentation tank is a structure for removing suspended solids in water by sedimentation, which is a water quality purification device. It uses the natural sedimentation or coagulation sedimentation of water to remove suspended solids in water. At present, in the field of water management and environmental protection, the sedimentation tank is widely used in water treatment and sewage treatment key facilities, mainly removing suspended solids, solid particles and nutrients in water through gravity sedimentation. However, after long-term use of the sedimentation tank, the edge of the sedimentation tank (water surface) is extremely easy to produce moss and other aquatic plants, and is easy to overgrow, which can cause negative effects on the water quality and ecological environment of the water treated by sedimentation. It not only affects the treatment efficiency of the sedimentation tank, but also easily causes water oxygen deficiency, eutrophication and other problems, thereby damaging the aquatic ecosystem and reducing the treatment effect of the sedimentation tank.

[0003] At the same time, since the moss is a bryophyte, it often adheres to the surface of the object and spreads, the moss is emerald green in color, and the stem is as thin as a silk thread, which can adhere to the rocks, pools, tiles, dilapidated walls, wetlands and other dark and humid places like hair. It also competes with waterweeds and other algae for nutrients, overconsumes nutrients in water, destroys normal material metabolism in water after sedimentation treatment, makes the water thin, inhibits the growth of waterweeds, and destroys the periodic growth of plankton, resulting in imbalance of water algae phase. At the same time, the dead moss is blown to the corner of the pool or rots on the bottom, which is easy to emit a foul odor, consumes water dissolved oxygen and produces many toxic and harmful substances during the decomposition process, causing water dissolved oxygen to decrease, harmful substances such as ammonia nitrogen, nitrite and hydrogen sulfide to increase, and water quality to deteriorate.

[0004] At present, the moss cleaning methods on the surface of the sedimentation tank mainly include the following methods:

[0005] Physical cleaning method: The physical cleaning method includes manual cleaning. Although these methods can remove moss to some extent, the efficiency is low, and secondary pollution of water body is easy to cause.

[0006] Chemical cleaning method: strong acid and strong alkali are used to remove moss. Although these methods have significant effect, they often have adverse effects on the water environment, increase harmful substances in water, easily cause secondary pollution of water treated by sedimentation, reduce the efficiency of sewage treatment, and affect the survival of aquatic organisms.

[0007] Therefore, how to treat the moss on the sedimentation tank is a technical problem to be solved by technical personnel at present. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a method for cleaning green algae in a sedimentation tank to solve the problems presented in the background.

[0009] To achieve the above object, the present application provides a method for cleaning green algae in a sedimentation tank, comprising the following steps:

[0010] S1, pretreating the green algae on the sedimentation tank, wherein the green algae is attached to the overflow weir of the sedimentation tank, the pretreatment comprises: converting the green algae on the sedimentation tank into a state convenient for removal by physical or chemical methods; the sedimentation tank is a vertical flow type sedimentation tank, the tank body plane is circular or square, and wastewater is discharged into the tank from the top down by a water inlet pipe arranged at the center of the sedimentation tank;

[0011] S2, after the pretreatment, spraying the green algae on the sedimentation tank, the spraying treatment comprises: spraying the overflow weir of the sedimentation tank with reclaimed water containing sodium hypochlorite at a temperature range of 20-30℃ to obtain a first wastewater solution, which is a primary clear solution mixed with suspended solids and sodium hypochlorite solution after the wastewater is treated by sedimentation;

[0012] S3, after a first predetermined time after the spraying is completed, ultraviolet irradiation is performed on the secondary wastewater solution to obtain a second wastewater solution, which is a secondary clear solution mixed with suspended solids and green algae residues after the primary clear solution is decomposed by light;

[0013] S4, post-treating the second wastewater solution to obtain a third wastewater solution, which is a clean clear solution mixed with various residual waste after post-treatment of the secondary clear solution;

[0014] S5, waste cleaning of the third wastewater solution to obtain clean water, which includes: collecting the green algae residues generated during the cleaning process in time, and short-term isolation or physical filtration of the treated third wastewater solution.

[0015] In one embodiment, the physical method includes: using a mechanical brush or a high-pressure water gun to preliminarily clean the surrounding and outer wall of the overflow weir to remove loose green algae on the surface; the chemical method includes: using a cleaning agent to adjust the pH value of the acid or alkaline solution until it is adjusted to a range suitable for green algae removal to promote the rupture and shedding of green algae cells.

[0016] In one embodiment, the spraying of the reclaimed water containing sodium hypochloride on the edge of the sedimentation tank comprises the following steps:

[0017] The water containing sodium hypochlorite solution is sprayed on the surface of the overflow weir along one of the starting points of the overflow weir in turn.

[0018] In one embodiment, the sodium hypochlorite concentration of the water containing sodium hypochlorite is 0.1% to 0.5%.

[0019] In one embodiment, the ultraviolet irradiation of the secondary sewage solution includes:

[0020] The ultraviolet lamp is kept at a distance of about 30cm to 50cm from the surface of the moss, and the irradiation time of the ultraviolet lamp is controlled at 30min-60min, and the wavelength of the ultraviolet lamp is 200nm to 280nm.

[0021] In one embodiment, the post-treatment of the second sewage solution includes:

[0022] A specific concentration of biological inhibitor is uniformly sprayed on the moss treatment area of the overflow weir, and the nitrogen and phosphorus ratio of the water body is reduced, and after a third preset time, water plants with inhibitory effect are added.

[0023] In one embodiment, the biological inhibitor includes one or more of the following: alginate, photosynthetic bacteria and lactic acid bacteria; and the aquatic plants include one or more of the following: water hyacinth, fox tail, reed and cattail.

[0024] In one embodiment, after step S5, step S6 is further included, which includes:

[0025] After a second preset time, the thickness of the moss on the overflow weir is detected, and if the thickness of the moss is greater than the reference thickness, reprocessing is performed;

[0026] The reprocessing includes using professional equipment or manual inspection of the moss coverage on the overflow weir to determine the moss coverage rate, and when the moss coverage rate is greater than 30%, the spraying or ultraviolet irradiation is restarted; wherein the moss coverage rate refers to.

[0027] In one embodiment, after step S6, step S7 is further included, which includes the following steps:

[0028] The water quality conditioner is used to adjust the pH value and dissolved oxygen concentration of the water body;

[0029] According to the pH value and dissolved oxygen concentration of the water body, the dissolved oxygen content in the water body is ensured to be moderate by supplementing oxygen or adjusting water flow, and a regular inspection and maintenance mechanism is established to regularly detect, clean and control the moss.

[0030] The present application has the following beneficial effects:

[0031] 1、The present application forms a multi-level green algae cleaning mechanism through four steps of the system, including pretreatment, spraying treatment, ultraviolet irradiation and biological inhibition. Through the combination of physical and chemical methods, the loose green algae in the sedimentation tank is effectively removed first, and then the green algae is sprayed with a solution containing sodium hypochlorite to ensure uniform contact of each green algae patch, achieving the desired chemical cleaning effect. In addition, ultraviolet irradiation further destroys the structure of green algae cells, enhancing the removal effect. Ultimately, this series of treatments not only significantly reduces the biomass of green algae, but also improves the light transmittance and oxygen content of the water body, thereby improving water quality and promoting the healthy development of the water body ecology.

[0032] 2、The present application can effectively inhibit the regeneration of green algae without causing negative effects on the water body through the introduction of biological inhibitors and aquatic plants in the post-treatment step. Biological inhibitors such as alginate, photosynthetic bacteria and lactic acid bacteria are natural substances with good environmental compatibility and do not pollute the water source. At the same time, by adding water hyacinth, fox tail and other aquatic plants, not only the growth of green algae is inhibited, but also the biodiversity of the water body is increased, promoting ecological balance. Regular water quality testing and maintenance ensure the continuous cleaning of the water body, forming a virtuous cycle, providing an effective solution for long-term management of the sedimentation tank, and thus improving the overall ecological benefits. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of the drawings.

[0034] Figure 1 The process flow chart of the green algae cleaning method provided by the embodiments of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the present application specification. Obviously, the described embodiments only constitute some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] It should be noted that the vertical flow sedimentation tank, also known as vertical sedimentation tank, its pool body plane is circular or square, its treated wastewater is discharged from the water inlet pipe arranged in the center of the sedimentation tank into the tank from top to bottom, the outlet of the water inlet is provided with an umbrella-shaped baffle, so that the wastewater is uniformly distributed in the tank, and then slowly rises along the entire cross section of the tank; the suspended solids in the vertical flow sedimentation tank will settle into the conical sludge hopper at the bottom of the tank under the action of gravity, and the clarified water is discharged from the overflow weir around the upper end of the tank. In practical application, a scum tank and a baffle can also be arranged in front of the overflow weir to ensure the water quality of the effluent. This kind of arrangement can make the sedimentation tank have small land occupation area, large depth, and conical bottom, and the wastewater in the sedimentation tank flows vertically, enters the tank from the water inlet pipe arranged in the center of the tank from top to bottom (the flow rate in the pipe should be less than 30 mm / s), and is uniformly distributed in the tank after the umbrella-shaped baffle arranged below the pipe, and then slowly rises along the entire cross section of the tank (for domestic wastewater, the flow rate is generally 0.5-0.7 mm / s, and the sedimentation time is 1-1.5 h). The suspended solids settle into the conical sludge hopper at the bottom of the tank, and the clarified water flows out from the overflow weir around the periphery of the tank, and a baffle and a scum tank are arranged in front of the weir to intercept the scum and ensure the water quality of the effluent. One side of the sedimentation tank is provided with a sludge discharge pipe (diameter greater than 200 mm) close to the tank wall to discharge the sludge regularly under the action of hydrostatic pressure. The sedimentation tank has the advantages of small land occupation area, easy sludge discharge, and is commonly used in wastewater treatment plants with water quantity less than 20000 m / d.

[0037] It should also be noted that the reclaimed water, also known as regenerated water, is water that can be reused after meeting the water quality standards and requirements of a certain use after treatment. However, reclaimed water is not equivalent to reclaimed water, and the water source of reclaimed water is more extensive, including domestic, industrial and agricultural wastewater, while the water source of reclaimed water usually specifically refers to the drainage in buildings or building complexes. In the aspect of sewage engineering, it is called "reclaimed water", and in the aspect of factory, it is called "reused water". Generally, water quality is used as the distinguishing mark, which mainly refers to urban sewage or domestic sewage treated to a certain water quality standard, which can be reused within a certain range. The water treated by deep purification treatment facilities (including the water treated by secondary treatment and deep treatment in wastewater treatment plants, and the concentrated water treated by large buildings, bathing water, washing vegetables, etc.) is collectively referred to as "reclaimed water". Its water quality is between tap water (upper water) and sewage (lower water) discharged into the pipeline, hence the name "reclaimed water". Reclaimed water utilization is also called wastewater reuse.

[0038] It is worth noting that the suspended matter refers to the organic and inorganic particulate matter suspended in the water body, i.e. unable to pass through 0.45 micron filter paper or filter, such as water-insoluble silt, clay, organic matter, algae and microorganisms, etc., the suspended matter refers to the solid matter suspended in the water, including water-insoluble inorganic matter, organic matter and silt, clay, microorganisms, etc.; the content of suspended matter in water is one of the indexes for measuring the degree of water pollution, and the suspended matter is the main cause of water turbidity, and the organic suspended matter in the water body is easy to anaerobic fermentation after deposition, which causes water quality deterioration; the suspended matter in water is a particle with a particle diameter of about 0.1 μm-100 μm, which can be seen by naked eye, and these particles are mainly composed of silt, clay, protozoa, algae, bacteria, viruses, and high molecular organic matter, etc.

[0039] The suspended solid or suspended colloidal organic and inorganic two parts, most of the organic part is detritus particles, which are composed of carbohydrates (see carbohydrates), proteins (see proteins), lipids (see lipids) and the like; the inorganic part includes terrigenous mineral debris (such as quartz, feldspar, carbonate and clay), aquatic minerals (such as precipitated glauconite and calcite, etc. Silicates, carbon); the particle size of the suspended matter is generally between several to several hundred microns, which is usually separated from seawater by a filter membrane with a pore size of 0.45 microns; the suspended matter contains two types of organic and inorganic components: (1) organic components, mainly biological debris, excrement and decomposition, composed of cellulose, starch and other carbohydrates, proteins, lipids and chitin; (2) inorganic components, including quartz, feldspar, carbonate and clay, etc. Mineral debris from the continent, silicates and other minerals generated in the seawater chemical process. Example 1:

[0040] Please refer to the attached Figure 1In the embodiment, since the overflow weir of the sedimentation tank grows a large amount of moss after long-term use, and as the accumulation of moss increases, it will cause the water in the sedimentation tank to accumulate a large amount of plankton, affecting the treatment effect of the sewage; at the same time, the treatment of the moss also needs the staff to clean repeatedly regularly, which greatly reduces the efficiency of sewage treatment; therefore, in this example, the moss on the sedimentation tank is pretreated first, and then the moss on the sedimentation tank is sprayed after the pretreatment to obtain a first sewage solution, the first sewage solution is a primary clear solution mixed with suspended solids and hypochlorous acid solution after the sedimentation treatment of domestic wastewater; after the first preset time after the end of the spraying, the hypochlorous acid can effectively inhibit the growth of the moss, and after the period, the second sewage solution is obtained by irradiating the secondary sewage solution with ultraviolet rays, the second sewage solution is a secondary clear solution mixed with suspended solids and moss residues after the primary clear solution is decomposed by light, which can decompose hypochlorous acid; the second sewage solution is post-treated to obtain a third sewage solution, the third sewage solution is a clean clear solution mixed with various residual waste after the post-treatment of the secondary clear solution; the third sewage solution is cleaned to obtain clean water, the waste cleaning includes: collecting the moss residues generated during the cleaning process in time, and short-term isolation or physical filtration of the treated third sewage solution.

[0041] It should be noted that the specific treatment includes the following methods:

[0042] 1. Pretreatment of moss

[0043] The moss is converted into a state convenient for removal by physical and chemical methods; specifically, the moss is attached to the overflow weir of the sedimentation tank, and the pretreatment includes converting the moss on the sedimentation tank into a state convenient for removal by physical or chemical methods; the sedimentation tank is a vertical flow sedimentation tank, the pool body plane is circular or square, and the wastewater is discharged from the water inlet pipe arranged in the center of the sedimentation tank into the pool from top to bottom.

[0044] 2. Spray treatment

[0045] Spray the moss with water containing sodium hypochlorite at a temperature range of 20-30°C; specifically, the spray treatment includes spraying the overflow weir of the sedimentation tank with water containing sodium hypochlorite at a temperature range of 20-30°C,

[0046] 3. Ultraviolet irradiation

[0047] The obtained first moss is irradiated with ultraviolet rays;

[0048] 4. Inhibit the growth of moss

[0049] Post-treatment of the second green algae to inhibit its growth;

[0050] 5. Waste disposal

[0051] The green algae residues, cleaning agents and other wastes generated during the cleaning process are promptly cleaned up to avoid the impact of residues on water quality and prevent the growth of green algae again; S501, the green algae residues generated during the cleaning process are promptly collected and treated to avoid the re-pollution of water bodies by green algae residues; S502, the treated water body is subjected to short-term isolation or physical filtration to ensure that there is no green algae residue and prevent the re-growth of green algae;

[0052] 6. Evaluation of cleaning effect

[0053] The green algae coverage in the sedimentation tank is regularly detected to evaluate the cleaning effect and ensure that the green algae has been completely removed; if there are residues, re-treatment is performed, including the following steps:

[0054] S601, the green algae coverage in the sedimentation tank is regularly checked using professional equipment or manual inspection to evaluate the cleaning effect;

[0055] S602, when incomplete cleaning is found, re-spraying or ultraviolet irradiation is performed to ensure the cleaning effect;

[0056] 7. Restoration of water body ecological balance

[0057] Water quality conditioners are used to adjust the pH value and dissolved oxygen concentration of the water body to restore the ecological balance of the water body and create a suitable environment to inhibit the growth of green algae; S701, appropriate water quality conditioners are used to adjust the water quality according to the pH value and dissolved oxygen concentration of the water body to promote the ecological balance of the water body; S702, by supplementing oxygen or adjusting water flow, the dissolved oxygen content in the water body is ensured to be moderate to avoid the re-growth of green algae

[0058] 8. Regular maintenance

[0059] A regular inspection and maintenance mechanism is established to regularly detect, clean and control green algae to ensure that the sedimentation tank remains clean for a long time and prevents the re-growth of green algae; specifically including the following steps:

[0060] S801, a monthly inspection and maintenance plan is established to regularly monitor the water quality changes and green algae growth of the sedimentation tank;

[0061] S802, according to the monitoring results, timely cleaning or control treatment is performed to ensure that the sedimentation tank remains green algae-free for a long time.

[0062] In addition, the S1 step specifically includes the following steps:

[0063] S101, use a mechanical brush or high-pressure water gun to clean the overflow weir of the sedimentation tank and the moss on the outside, remove the loose moss on the surface;

[0064] S102, use a cleaning agent combined with an acidic or alkaline solution to adjust the pH value to a range suitable for moss removal, thereby promoting the rupture and shedding of moss cells.

[0065] S2 includes the following steps:

[0066] S201, uniformly spray sodium hypochlorite solution on the surface of the moss to ensure that each moss patch is evenly contacted with the solution;

[0067] S202, the spraying time is controlled within 15-30 minutes to ensure that the surface layer of the moss is fully chemically affected to form the first moss.

[0068] The concentration of sodium hypochlorite prepared in step S201 is 0.1% to 0.5%.

[0069] S3 includes the following steps:

[0070] S301, keep the ultraviolet lamp tube at a distance of about 30-50 cm from the surface of the moss;

[0071] S302, the irradiation time is controlled within 30-60 minutes, using the sterilization effect of ultraviolet light to destroy the cell structure and DNA inside the moss, and finally obtaining the second moss.

[0072] The wavelength of the ultraviolet lamp tube in step S301 is 200-280 nm.

[0073] S4 includes the following steps:

[0074] S401, use a specific concentration of biological inhibitor to uniformly spray the moss treatment area;

[0075] S402, reduce the nitrogen and phosphorus ratio of the water body and regularly add water plants with inhibitory effect to maintain the ecological balance of the water body;

[0076] S403, regularly detect and maintain the water quality to ensure the cleanliness of the water body and the suitable growth environment, thereby effectively inhibiting the regeneration of the moss.

[0077] The biological inhibitor in step S401 specifically includes one or more combinations of alginate, photosynthetic bacteria, and lactic acid bacteria.

[0078] The water plants with inhibitory effect in step S402 include water hyacinth, fox tail, algal reed, and cattail. Embodiment

[0079] S1, pretreatment of the moss

[0080] S101: Use high-pressure water gun to clean the overflow weir inner wall and side of the sedimentation tank, remove 80% of loose moss.

[0081] S102: Use an acidic cleaning agent with a pH of 4 to promote moss cell rupture.

[0082] S2, spray treatment

[0083] S201: Spray a 0.3% sodium hypochlorite solution.

[0084] S202: Spray time is controlled at 20 minutes.

[0085] S3, UV irradiation

[0086] S301: The distance between the UV lamp and the moss surface is kept at 40 cm.

[0087] S302: The irradiation time is controlled at 45 minutes.

[0088] S4, inhibit the growth of moss

[0089] S401: Use photosynthetic bacteria as a biological inhibitor.

[0090] S402: Add water hyacinth as an aquatic plant inhibitor.

[0091] S1, pretreatment of moss

[0092] S101: Use a mechanical brush to clean the inner wall of the sedimentation tank, removing 70% of the moss.

[0093] S102: Use an alkaline solution with a pH of 8 to promote moss cell shedding.

[0094] S2, spray treatment

[0095] S201: Spray a 0.2% sodium hypochlorite solution.

[0096] S202: Spray time is controlled at 25 minutes.

[0097] S3, UV irradiation

[0098] S301: The distance between the UV lamp and the moss surface is kept at 30 cm.

[0099] S302: The irradiation time is controlled at 30 minutes.

[0100] S4, inhibit the growth of moss

[0101] S401: Use alginate as a biological inhibitor.

[0102] S402: Add cattail as aquatic plant inhibitor. Embodiment

[0103] S1, Pretreatment of green algae

[0104] S101: Use high-pressure water gun to clean the overflow weir of the sedimentation tank, remove 90% of loose green algae.

[0105] S102: Use a neutral pH cleaner to promote green algae cell rupture.

[0106] S2, Spray treatment

[0107] S201: Spray 0.4% sodium hypochlorite solution.

[0108] S202: Spray time is controlled at 15 minutes.

[0109] S3, UV irradiation

[0110] S301: The distance between the UV lamp and the surface of the green algae is kept at 50 cm.

[0111] S302: The irradiation time is controlled at 60 minutes.

[0112] S4, Inhibit the growth of green algae

[0113] S401: Use lactic acid bacteria as biological inhibitor.

[0114] S402: Add cattail as aquatic plant inhibitor. Embodiment

[0115] S1, Pretreatment of green algae

[0116] S101: Mechanical brush and high-pressure water gun are used in combination to remove 85% of green algae.

[0117] S102: Use a cleaner with a pH of 6 to promote green algae cell shedding.

[0118] S2, Spray treatment

[0119] S201: Spray 0.1% sodium hypochlorite solution.

[0120] S202: Spray time is controlled at 30 minutes.

[0121] S3, UV irradiation

[0122] S301: The distance between the UV lamp and the surface of the green algae is kept at 35 cm.

[0123] S302: The irradiation time is controlled at 50 minutes.

[0124] S4, Inhibit the growth of green algae

[0125] S401: Using a combination of alginate and photosynthetic bacteria as a biological inhibitor.

[0126] S402: Adding reed as an inhibitor of aquatic plants.

[0127] Table I: Summary of implementation results.

[0128] Examples Cleaning effect (%) Sodium hypochlorite concentration (%) Spraying time (minutes) UV irradiation time (minutes) Biological inhibitor Aquatic plant Example two 80 0.3 20 45 Photosynthetic bacteria Water hyacinth Example three 70 0.2 25 30 Alginate Cattail Example four 90 0.4 15 60 Lactic acid bacteria Fox tail Example five 85 0.1 30 50 Alginate + photosynthetic bacteria Algae reed Table I;

[0129] Conclusion: From Table I, we can see that:

[0130] Cleaning effect: The preliminary cleaning effect (percentage of removed moss) of different examples fluctuates between 70% and 90%, indicating the effectiveness of physical and chemical pretreatment. Higher cleaning effect is usually associated with stronger physical cleaning methods (such as high-pressure water gun or mechanical brush).

[0131] Sodium hypochlorite concentration: The sodium hypochlorite concentration of all examples is between 0.1% and 0.4%, showing that effective chemical cleaning can still be achieved at lower concentrations. Higher concentration applications (such as 0.4%) are usually combined with shorter spraying time to achieve ideal cleaning effect.

[0132] Spraying time: The spraying time is controlled within 15 to 30 minutes, and long spraying time can enhance the contact between moss and chemical solution, promote chemical reaction, and thus improve cleaning efficiency.

[0133] UV irradiation: The choice of UV irradiation time (30 to 60 minutes) directly affects the cell damage effect of moss, and longer irradiation time can more effectively kill moss cells; at the same time, UV irradiation can effectively decompose hypochloric acid, avoiding the need for secondary treatment of hypochloric acid.

[0134] Biological inhibitors and aquatic plants: The use of biological inhibitors (such as photosynthetic bacteria, alginate, lactic acid bacteria) and aquatic plants (such as water hyacinth, cattail, fox tail, reed) in different examples is diversified, indicating flexibility and adaptability in inhibiting the growth of moss.

[0135] To sum up: the present application forms a multi-level green algae cleaning mechanism through the four steps of the system, including pretreatment, spraying treatment, ultraviolet irradiation and biological inhibition. Through the combination of physical and chemical methods, the loose green algae in the sedimentation tank is first effectively removed, and then the green algae is sprayed with a solution containing sodium hypochlorite to ensure uniform contact of each green algae patch, achieving the ideal chemical cleaning effect. In addition, ultraviolet irradiation further destroys the structure of green algae cells, enhancing the removal effect. Ultimately, this series of treatments not only significantly reduces the biomass of green algae, but also improves the light transmittance and oxygen content of the water body, thereby improving the water quality and promoting the healthy development of the water body ecology.

[0136] Embodiment 3

[0137] In this embodiment, in order to specifically implement the above steps, the second wastewater solution is subjected to post-treatment, including:

[0138] By uniformly spraying a specific concentration of biological inhibitors on the green algae treatment area of the overflow weir, the nitrogen and phosphorus ratio of the water body is reduced, and after a third predetermined time, aquatic plants with inhibitory effect are added to further effectively biologically treat the wastewater, improving the quality of wastewater treatment.

[0139] Meanwhile, after step S5, in order to reduce, a step S6 is further included, which comprises:

[0140] After a second predetermined time, the thickness of the green algae on the overflow weir is detected, wherein the thickness of the green algae is the length of the green algae growing on the overflow weir, and the reference thickness is determined by empirical value, under normal circumstances, the growth of the green algae with hypochlorous acid inhibition is usually not too fast; if the thickness of the green algae is greater than the reference thickness, re-treatment is performed;

[0141] The re-treatment includes using professional equipment or manual inspection of the green algae coverage on the overflow weir to determine the green algae coverage rate, and when the green algae coverage rate is greater than 30%, re-spraying or ultraviolet irradiation is performed; wherein the green algae coverage rate refers to the land area ratio covered by the green algae growing on the overflow weir of the sedimentation tank.

[0142] In addition, after the step S6, a step S7 is further included, which comprises the following steps:

[0143] Using a water quality conditioner to adjust the pH value and dissolved oxygen concentration of the water body;

[0144] According to the pH value and dissolved oxygen concentration of the water body, by supplementing oxygen or adjusting water flow, the dissolved oxygen content in the water body is ensured to be moderate, and a regular inspection and maintenance mechanism is established to regularly detect, clean and control the green algae.

[0145] The periphery and outer wall of the overflow weir are preliminarily cleaned by mechanical brush or high-pressure water gun to remove loose moss on the surface; the chemical method comprises: adjusting pH value by using cleaning agent combined with acid or alkaline solution until the range suitable for moss removal is reached, promoting the rupture and shedding of moss cells, effectively removing moss, and achieving the purpose of treating sewage.

[0146] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for cleaning moss from a sedimentation basin, characterized in that The method comprises the following steps: S1, pretreating the moss on the sedimentation tank, wherein the moss is attached to the overflow weir of the sedimentation tank, the pretreatment comprises: converting the moss on the sedimentation tank into a state convenient for removal by a physical method or a chemical method, the physical method comprises using a mechanical brush or a high-pressure water gun to preliminarily clean the periphery and outer wall of the overflow weir to remove loose moss on the surface; the chemical method comprises using a cleaning agent combined with an acidic or alkaline solution to adjust the pH value to promote the rupture and shedding of moss cells, the sedimentation tank is a vertical flow sedimentation tank, the tank body is circular or square, and wastewater is discharged into the tank from the water inlet pipe arranged at the center of the sedimentation tank from top to bottom; S2, after the pretreatment, the moss on the sedimentation tank is subjected to a spray treatment, the spray treatment comprises: spraying the overflow weir of the sedimentation tank with reclaimed water containing sodium hypochlorite at a temperature range of 20-30 DEG C to obtain a first wastewater solution, the first wastewater solution is a primary clear solution obtained by mixing suspended solids and sodium hypochlorite solution after the domestic wastewater is subjected to sedimentation treatment, the sodium hypochlorite in the reclaimed water containing sodium hypochlorite has a preparation concentration of 0.1%-0.5%, and the spraying time is controlled within 15-30 min; S3, after a first preset time after the spraying is completed, the secondary wastewater solution is subjected to ultraviolet irradiation to obtain a second wastewater solution, the second wastewater solution is a middle-stage clear solution obtained by mixing suspended solids and moss residues after the primary clear solution is subjected to photolysis, the ultraviolet irradiation comprises keeping the ultraviolet lamp tube at a distance of 30-50 cm from the surface of the moss, the irradiation time of the ultraviolet lamp tube is controlled within 30-60 min, and the wavelength of the ultraviolet lamp tube is 200-280 nm; S4, the second wastewater solution is subjected to post-treatment to obtain a third wastewater solution, the third wastewater solution is a clean clear solution obtained by mixing various residual waste after the post-treatment of the middle-stage clear solution, and the post-treatment of the second wastewater solution comprises: uniformly spraying a biological inhibitor on the moss treatment area of the overflow weir and reducing the nitrogen and phosphorus ratio of the water body, and adding water plants with inhibitory effect after a third preset time; the biological inhibitor comprises one or more of the following: alginate, photosynthetic bacteria and lactic acid bacteria; the water plants comprise one or more of the following: water hyacinth, fox tail, algal reed and cattail; S5, the third wastewater solution is subjected to waste cleaning to obtain clean water, and the waste cleaning comprises: collecting the moss residues generated in the cleaning process in time, and short-term isolating or physically filtering the treated third wastewater solution.

2. The method of moss removal according to claim 1, wherein The reclaimed water containing sodium hypochlorite is sprayed on the edge of the sedimentation tank, comprising the following steps: The reclaimed water containing sodium hypochlorite is sprayed on the surface of the overflow weir along one starting point of the overflow weir in turn.

3. The method of moss removal according to claim 1, wherein After step S5, step S6 is further included, which comprises: After the second preset time length, the moss thickness on the overflow weir is detected, and if the moss thickness is greater than the reference thickness, reprocessing is performed; The reprocessing includes using professional equipment or manual inspection of the moss coverage on the overflow weir to determine the moss coverage rate, and when the moss coverage rate is greater than 30%, re-spraying or ultraviolet irradiation is performed; wherein the moss coverage rate refers to the ratio of the area covered by the moss growing on the overflow weir of the sedimentation tank.

4. The method of moss removal according to claim 3, wherein After the step S6, there is also a step S7, which includes the following steps: Adjusting the pH value and dissolved oxygen concentration of the water body using a water quality conditioner; According to the pH value and dissolved oxygen concentration of the water body, by supplementing oxygen or adjusting water flow, the dissolved oxygen content in the water body is ensured to be moderate and a regular inspection and maintenance mechanism is established, and regular detection, cleaning and prevention and control of the moss are performed.

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