Prawn culture wastewater purification and circulation treatment method

Abstract

The invention relates to the technical field of wastewater treatment, and particularly discloses a prawn culture wastewater purification and circulation treatment method which comprises the following steps: introducing prawn culture wastewater into a solid-liquid separation device, and removing larger particulate matters in the wastewater in a physical filtration manner; feeding the wastewater into a biological treatment pond, and adding a microbial agent into the biological treatment pond every day according to the wastewater treatment capacity; feeding the wastewater into a precipitation filtering tank; feeding the wastewater into a disinfection and sterilization device, and disinfecting and sterilizing the wastewater by adopting ultraviolet disinfection or ozone disinfection; the wastewater enters a water quality adjusting tank, and water quality parameters of the wastewater are adjusted according to water quality requirements of prawn culture; and the wastewater subjected to water quality regulation returns to the prawn culture pond again, so that cyclic utilization of water resources is realized. By adopting the prawn culture wastewater circulating purification water treatment method, prawn culture wastewater can be efficiently purified, cyclic utilization of water resources is achieved, culture cost is reduced, and meanwhile pollution to the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a method for purifying and circulating shrimp breeding wastewater. Background Art

[0002] Shrimp farming is an important part of aquaculture, but a large amount of wastewater is generated during the shrimp farming process. With the continuous development of the shrimp farming industry, the problem of aquaculture wastewater treatment has become increasingly prominent. Shrimp farming wastewater contains a large amount of leftover bait, feces, biological metabolites, etc. If it is directly discharged without effective treatment, it will not only cause serious pollution to the environment, but also waste a lot of water resources. At present, traditional shrimp farming wastewater treatment methods have problems such as poor treatment effect, high cost, and low resource utilization, which are difficult to meet the requirements of sustainable development. Summary of the invention

[0003] The purpose of the present invention is to provide a method for circulating and purifying shrimp aquaculture wastewater to solve the problems existing in the prior art. The method can efficiently purify shrimp aquaculture wastewater, realize the recycling of water resources, reduce aquaculture costs, and reduce pollution to the environment.

[0004] To achieve the above object, the present invention provides a method for purifying and circulating shrimp aquaculture wastewater, comprising the following steps: Step 1: solid-liquid separation: introducing the shrimp farming wastewater into a solid-liquid separation device to remove larger particles in the wastewater by physical filtration; Step 2, biological treatment, the wastewater after solid-liquid separation enters the biological treatment pool, and microbial agents are added to the biological treatment pool every day according to the wastewater treatment volume to activate the microbial agents. The activated microbial agents are evenly sprayed into the wastewater for three consecutive days to remove harmful substances in the wastewater by the metabolism of microorganisms; Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration; Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device, and ultraviolet disinfection or ozone disinfection is used to disinfect and sterilize the wastewater to remove microorganisms in the wastewater and ensure the sanitation and safety of the wastewater; Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming; Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

[0005] Preferably, in step 2, the microbial agent is composed of Bacillus group, lactic acid bacteria group, yeast group, nitrifying bacteria, photosynthetic bacteria, Bacillus thuringiensis, flocculants, adjuvants, and carriers, and the total number of live bacteria in the microbial agent is not less than 20 billion / gram.

[0006] Preferably, in step 2, the specific method of activating the microbial agent is: Dissolve 250 grams of microbial agent and fluid polysaccharide composite bacterial nutrient medium in 20 kilograms of 35°C warm water respectively. After activation for 24 hours, it can be used.

[0007] Preferably, in step 2, the amount of microbial agent added is 3 Add 1 kg of microbial agent into the wastewater.

[0008] Preferably, in step 4, ultraviolet disinfection is used, the ultraviolet irradiation intensity is 30-40mW / cm², and the irradiation time is 0.5-1 hour.

[0009] Preferably, in step 4, ozone disinfection is adopted, the ozone dosage is 10-20 mg / L, and the contact time is 15-30 min.

[0010] Preferably, in step five, the water quality conditioner includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

[0011] The advantages and positive effects of the shrimp aquaculture wastewater purification and circulation treatment method described in the present invention are: 1. The shrimp farming wastewater purification and recycling treatment method of the present invention can efficiently remove harmful substances in the wastewater. The purified water quality meets the requirements of shrimp farming, realizes the recycling of water resources, and reduces the farming cost.

[0012] 2. This method combines multiple treatment processes such as physical filtration, biological treatment, sedimentation filtration, disinfection and sterilization. The treatment effect is stable and reliable, and can effectively reduce pollution to the environment.

[0013] 3. The water quality adjustment step can flexibly adjust the water quality parameters of the wastewater according to the actual needs of shrimp farming, thereby improving the success rate and yield of farming.

[0014] 4. The method of the present invention is simple to operate, has low operating cost, and is suitable for large-scale promotion and application. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further illustrated by the following examples.

[0016] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0017] Example 1 A shrimp farming base has a farming area of ​​1,000 square meters and a daily discharge of 50 cubic meters of aquaculture wastewater. A shrimp farming wastewater purification and recycling treatment method is used for treatment. The specific steps are as follows: Step 1: Solid-liquid separation: introduce the shrimp farming wastewater into the solid-liquid separation device to remove larger particles in the wastewater by physical filtration. The solid-liquid separation device can use filters, grids and other equipment, and select the appropriate filtration accuracy according to the flow rate and impurity content of the wastewater. Select a filter with a pore size of 1mm as the solid-liquid separation device, introduce the farming wastewater into the filter for filtration, and remove larger particles in the wastewater.

[0018] Step 2, biological treatment. The wastewater after solid-liquid separation enters the biological treatment pool. According to the wastewater treatment volume, microbial agents are added to the biological treatment pool every day to activate the microbial agents. The activated microbial agents are evenly sprayed into the wastewater for three consecutive days to remove harmful substances in the wastewater using the metabolic action of microorganisms.

[0019] The microbial agent is composed of Bacillus groups, lactic acid bacteria groups, yeast groups, nitrifying bacteria, photosynthetic bacteria, Bacillus thuringiensis, flocculants, adjuvants and carriers. The total number of live bacteria in the microbial agent is not less than 20 billion / gram.

[0020] The specific method of activating microbial agents is: Dissolve 250 grams of microbial agent and fluid polysaccharide composite bacterial nutrient medium in 20 kilograms of 35°C warm water respectively. After activation for 24 hours, it can be used.

[0021] The amount of microbial agent added is 50m 3 Add 1 kg of microbial agent into the wastewater.

[0022] Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration. The sedimentation time is 3-5 hours. The wastewater after sedimentation is then filtered through a sand filter to remove suspended matter and microbial metabolites in the wastewater.

[0023] Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device and is disinfected by ultraviolet light. The intensity of ultraviolet light is 30-40mW / cm² and the irradiation time is 0.5 hours to remove microorganisms in the wastewater and ensure the hygiene and safety of the wastewater.

[0024] Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming. The water quality regulator includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

[0025] Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

[0026] Example 2 A large shrimp farming enterprise has a farming area of ​​5,000 square meters and a daily discharge of 250 cubic meters of aquaculture wastewater. A shrimp farming wastewater purification and recycling treatment method is used for treatment. The specific steps are as follows: Step 1: Solid-liquid separation: introduce the shrimp farming wastewater into the solid-liquid separation device to remove larger particles in the wastewater by physical filtration. The solid-liquid separation device can use filters, grids and other equipment, and select the appropriate filtration accuracy according to the flow rate and impurity content of the wastewater. Select a grid with a pore size of 0.5mm as the solid-liquid separation device, introduce the farming wastewater into the grid for filtration, and remove larger particles in the wastewater.

[0027] Step 2, biological treatment. The wastewater after solid-liquid separation enters the biological treatment pool. According to the wastewater treatment volume, microbial agents are added to the biological treatment pool every day to activate the microbial agents. The activated microbial agents are evenly sprayed into the wastewater for three consecutive days to remove harmful substances in the wastewater using the metabolic action of microorganisms.

[0028] The microbial agent is composed of Bacillus groups, lactic acid bacteria groups, yeast groups, nitrifying bacteria, photosynthetic bacteria, Bacillus thuringiensis, flocculants, adjuvants and carriers. The total number of live bacteria in the microbial agent is not less than 20 billion / gram.

[0029] The specific method of activating microbial agents is: Dissolve 250 grams of microbial agent and fluid polysaccharide composite bacterial nutrient medium in 20 kilograms of 35°C warm water respectively. After activation for 24 hours, it can be used.

[0030] The amount of microbial agent added is 50m 3 Add 1 kg of microbial agent into the wastewater.

[0031] Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration. The sedimentation time is 4-5 hours. The wastewater after sedimentation is then filtered through a fiber filter to remove suspended matter and microbial metabolites in the wastewater.

[0032] Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device, and ozone disinfection is used to disinfect and sterilize the wastewater after sedimentation and filtration. The ozone dosage is 10-20 mg / L, and the contact time is 20 minutes to remove microorganisms in the wastewater and ensure the hygiene and safety of the wastewater.

[0033] Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming. The water quality regulator includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

[0034] Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

[0035] Comparative Example 1 A shrimp farming base has a farming area of ​​1,000 square meters and a daily discharge of 50 cubic meters of aquaculture wastewater. A shrimp farming wastewater purification and recycling treatment method is used for treatment. The specific steps are as follows: Step 1: Solid-liquid separation: introduce the shrimp farming wastewater into the solid-liquid separation device to remove larger particles in the wastewater by physical filtration. The solid-liquid separation device can use filters, grids and other equipment, and select the appropriate filtration accuracy according to the flow rate and impurity content of the wastewater. Select a filter with a pore size of 1mm as the solid-liquid separation device, introduce the farming wastewater into the filter for filtration, and remove larger particles in the wastewater.

[0036] Step 2, biological treatment. The wastewater after solid-liquid separation enters the biological treatment tank. An appropriate amount of activated sludge is added to the biological treatment tank. After a period of cultivation and domestication, the microorganisms in the activated sludge can effectively remove harmful substances such as organic matter, ammonia nitrogen, nitrite, etc. in the wastewater.

[0037] Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration. The sedimentation time is 3-5 hours. The wastewater after sedimentation is then filtered through a sand filter to remove suspended matter and microbial metabolites in the wastewater.

[0038] Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device and is disinfected by ultraviolet light. The intensity of ultraviolet light is 30-40mW / cm² and the irradiation time is 0.5 hours to remove microorganisms in the wastewater and ensure the hygiene and safety of the wastewater.

[0039] Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming. The water quality regulator includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

[0040] Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

[0041] Comparative Example 2 A large shrimp farming enterprise has a farming area of ​​5,000 square meters and a daily discharge of 250 cubic meters of aquaculture wastewater. A shrimp farming wastewater purification and recycling treatment method is used for treatment. The specific steps are as follows: Step 1: Solid-liquid separation: introduce the shrimp farming wastewater into the solid-liquid separation device to remove larger particles in the wastewater by physical filtration. A grid with a pore size of 0.5 mm is selected as the solid-liquid separation device, and the farming wastewater is introduced into the grid for filtration to remove larger particles in the wastewater.

[0042] Step 2: Biological treatment: After solid-liquid separation, the wastewater enters the biological treatment pool. The biological treatment pool adopts the biofilm method. Biological fillers are set in the pool to allow microorganisms to form a biofilm on the surface of the fillers. The biological treatment time is 24 hours.

[0043] Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration. The sedimentation time is 4-5 hours. The wastewater after sedimentation is then filtered through a fiber filter to remove suspended matter and microbial metabolites in the wastewater.

[0044] Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device, and ozone disinfection is used to disinfect and sterilize the wastewater after sedimentation and filtration. The ozone dosage is 10-20 mg / L, and the contact time is 20 minutes to remove microorganisms in the wastewater and ensure the hygiene and safety of the wastewater.

[0045] Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming. The water quality regulator includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

[0046] Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

[0047] The water quality parameters of the wastewater treated in step 4 of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 were measured respectively, and the specific results are shown in Table 1.

[0048] The water quality parameters were determined by referring to the test methods of HJ537-2009 "Determination of ammonia nitrogen in water - Distillation-neutralization titration method", GB / T11894-1989 "Determination of total nitrogen in water - Alkaline potassium persulfate digestion ultraviolet spectrophotometry", GB11913-1989 "Determination of dissolved oxygen in water - Electrochemical probe method", GB7498-1987 "Determination of nitrite nitrogen in water - Spectrophotometry", "Determination of transparency - Transparency meter method, disk method" and GB11914-89 "Determination of chemical oxygen demand in water - Dichromate method".

[0049] Table 1 Water quality parameter test results

[0050] It can be seen from the data in Table 1 that the biological treatment methods adopted in Example 1 and Comparative Example 1, and in Example 2 and Comparative Example 2 are different. Example 1-2 adopts spraying microbial agents in the wastewater, and Comparative Example 1-2 adopts activated sludge or biofilm in the prior art to remove ammonia nitrogen and total nitrogen in the wastewater. The contents of ammonia nitrogen and total nitrogen in Example 1-2 are lower than those in Comparative Example 1-2, and the water quality parameters of Example 1-2 are better than those of Comparative Example 1-2, indicating that the wastewater treated by the treatment method of the present invention is more suitable for recycling and circulation for shrimp farming.

[0051] Therefore, the present invention adopts the above-mentioned shrimp farming wastewater circulation purification water treatment method to solve the problems existing in the prior art. The method can efficiently purify shrimp farming wastewater, realize the recycling of water resources, reduce farming costs, and reduce pollution to the environment.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for purifying and recycling shrimp farming wastewater, characterized in that: The steps include: Step 1: solid-liquid separation: introducing the shrimp farming wastewater into a solid-liquid separation device to remove larger particles in the wastewater by physical filtration; Step 2, biological treatment, the wastewater after solid-liquid separation enters the biological treatment pool, and microbial agents are added to the biological treatment pool every day according to the wastewater treatment volume to activate the microbial agents. The activated microbial agents are evenly sprayed into the wastewater for three consecutive days to remove harmful substances in the wastewater by the metabolism of microorganisms; Step 3: Sedimentation and filtration: The wastewater after biological treatment enters the sedimentation and filtration tank to remove suspended matter and microbial metabolites in the wastewater through natural sedimentation and filtration; Step 4: Disinfection and sterilization: the wastewater after sedimentation and filtration enters the disinfection and sterilization device, and ultraviolet disinfection or ozone disinfection is used to disinfect and sterilize the wastewater to remove microorganisms in the wastewater and ensure the sanitation and safety of the wastewater; Step 5: Water quality adjustment: the wastewater after disinfection and sterilization enters the water quality adjustment tank. According to the water quality requirements of shrimp farming, an appropriate amount of water quality regulator is added to adjust the water quality parameters of the wastewater to meet the requirements of shrimp farming; Step 6: Recycling: the wastewater after water quality adjustment returns to the shrimp breeding pond to achieve the recycling of water resources. At the same time, the breeding system is regularly monitored and maintained to ensure the treatment effect and stable water quality of the breeding wastewater.

2. A method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 2, the microbial agent is composed of bacillus group, lactic acid bacteria group, yeast group, nitrifying bacteria, photosynthetic bacteria, Bacillus thuringiensis, flocculants, adjuvants, and carriers, and the total number of live bacteria in the microbial agent is not less than 20 billion / gram.

3. The method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 2, the specific method of activating the microbial agent is: Dissolve 250 grams of microbial agent and fluid polysaccharide composite bacterial nutrient medium in 20 kilograms of 35°C warm water respectively. After activation for 24 hours, it can be used.

4. The method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 2, the amount of microbial agent added is 50m 3 Add 1 kg of microbial agent into the wastewater.

5. The method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 4, ultraviolet disinfection is used, the ultraviolet irradiation intensity is 30-40mW / cm², and the irradiation time is 0.5-1 hour.

6. A method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 4, ozone disinfection is used, the ozone dosage is 10-20 mg / L, and the contact time is 15-30 minutes.

7. The method for purifying and circulating shrimp aquaculture wastewater according to claim 1, characterized in that: In step 5, the water quality regulator includes one or more of sodium carbonate, sodium bicarbonate, sodium sulfate, quicklime, calcium peroxide, and sodium hydroxide.

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