CN103896442A - Pig farm wastewater treatment method - Google Patents
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- Biological Treatment Of Waste Water (AREA)
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Abstract
The invention provides a pig farm wastewater treatment method. The method comprises the processes of rain-sewage separation treatment, dry-wet separation treatment, solid-liquid separation treatment and purification treatment, and the purification treatment process comprises the steps of biological integrated wastewater treatment and biological pond purification treatment. The method adopting the above technical scheme has the advantages of easy realization, low cost, compact treatment facility, substantial saving of the occupied area, and shortening of the reaction time, and an apparatus for implementing the method has the advantages of corrosion resistance, low noise, basically no peculiar smell, and long life.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of wastewater treatment, in particular to a novel wastewater treatment technology for purifying intensive pig farm wastewater by using a biological-ecological composite treatment technology and realizing harmless and recycling of the wastewater.
[ background of the invention ]
The waste water of the intensive pig farm mainly comes from pig manure, pig urine and pigsty washing water, and has the characteristics of large discharge amount, high organic matter concentration and high ammonia nitrogen content. According to survey and calculation, the main water quality indexes of the dry-wet separated piggery wastewater are as follows:
the wastewater treatment and comprehensive utilization technology for the large-scale livestock and poultry farm comprises the following processes: natural biological treatment, aerobic treatment, anaerobic-aerobic combined treatment, ecological engineering-biogas engineering treatment and the like. In general, the COD of the aerobic treatment of activated sludge iscrThe removal rate of BOD and SS is higher and can reach the discharge standard, but the removal rate of N, P is low, the engineering investment is large, and the operating cost is high; biological treatment of COD, BOD5The removal rate of SS, N and P is high, the emission standard can be achieved, the cost is low, but the occupied area is too large, the period is too long, and the popularization is difficult in places with short land; the anaerobic biological method can treat the wastewater with high concentration organic matter, has less self energy consumption and low operation cost, generates energy, but the BOD of the high concentration organic wastewater is often in the water after the anaerobic treatment5There are
Even more, it is difficult to meet current emission standards. In addition, in the anaerobic treatment process, organic nitrogen is converted into ammonia nitrogen, sulfide is converted into hydrogen sulfide, and the treated wastewater still has certain odor and needs to be subjected to further aerobic biological treatment. The anaerobic-aerobic combined treatment overcomes the defects of large energy consumption and shortage of land area in aerobic treatment and the defect that the anaerobic treatment cannot meet the requirement, has the advantages of low investment, low operation cost, good purification effect, high energy and environment comprehensive benefit and the like, and is particularly suitable for the wastewater treatment of livestock and poultry farms generating high-concentration organic wastewater. The typical process of anaerobic-aerobic combined treatment is UASB + activated sludge process or biological contact oxidation ^ oxidation pond, and after the livestock and poultry farm wastewater is treated by the process, the effluent can be used for irrigation and cultivation and also reaches the discharge standard. The capacity of the fermentation device for the ecological engineering-biogas engineering treatment method is 2-4 times of daily wastewater discharge, and one-time investment is large. However, biogas fermentation can treat wastewater containing high concentrations of organic matterThe energy consumption is low, the operation cost is low, and the methane is an excellent pollution-free fuel and has better economic benefit. Because the biogas fermentation efficiency of the wastewater with the organic matter content of below 1000mg/L is not high, the removal rate of the organic matter in the wastewater cannot reach 100 percent even in high-temperature fermentation, and therefore, the wastewater after biogas fermentation is subjected to aerobic treatment. The running cost of the above processes exceeds 2 yuan/m3And (4) waste water.
Domestic pig farm wastewater treatment mainly comprises an anaerobic and aerobic combined treatment process. Zhang Yuan Bian proposes two pig farm excrement and waste water treating modes of 'anaerobic treatment-natural treatment' and 'anaerobic treatment-returning to field', the former is suitable for suburbs of large and medium cities in pig farm, has no enough farmland to absorb pig excrement and waste water, but has proper mudflat, wet land or low-lying land around, can be used as a region of a waste water natural treating system, the scale of the pig farm is medium, artificial dry clear excrement is taken as a main part, water washing is taken as an auxiliary part, and COD (chemical oxygen demand) of inlet water is taken as a main partcr6000 mg/L; the latter is suitable for the area where the farmland has enough water to absorb the water discharged after anaerobic treatment, in particular for the base for planting perennial fertilizer crops such as vegetables and economic crops. And proposes enhanced manure pretreatment (including dry-wet separation and settling tanks) to improve anaerobic digestion efficiency. The analysis of longevity and harvest the technical characteristics of the Hangzhou lighthouse cultivation general farm biogas and wastewater treatment project, the project adopts a rotary grating machine and a special hydraulic screen to separate the separated excrement slag for manufacturing organic fertilizer), the effluent is treated by the technology of UASB, SBR and coagulating sedimentation, and the COD concentration of the influent water is treatedcr5616～9965mg/L，BOD5 3960～4460mg/L，SS 2310～5410mg/L，NH3COD of effluent water at-N634-1114 mg/Lcr97～113mg/L，BOD5 11.2～19.9mg/L，SS 60～90mg/L，
But the operating cost is as high as 2.5 yuan/m3And (4) waste water. Benzyl has been brought to life, etc. and has proposed countryside forest Weihua, etc. and introduced the engineering design and operation condition of adopting "CSTR + SBR" technology to treat the pig manure waste water, the result shows: COD at the concentration of influent water pollutantscr9600mg/L，BOD5 5000mg/L，SS 6000mg/L，NH3at-N800 mg/L, COD of the effluentcr250mg/L，BOD5 65mg/L，SS150mg/L，NH3-N7.9 mg/L. The running cost is 1.5 yuan/m3And (4) waste water. The Panyon jade article introduces the practical operation condition of adopting the high-grade comprehensive stabilization pond (high-grade facultative pond, high-load pond, algae sedimentation pond and ecological pond) process to treat the wastewater of a certain pig farm in Guangzhou city, and the result shows that: COD at the concentration of influent water pollutantscr15899mg/L，BOD5 10840mg/L，SS 3024mg/L，NH3COD of effluent under-N1283 mg/L conditioncr71。5mg/L，BOD5 23mg/L，SS 34mg/L，NH3-N66.5 mg/L. The running cost is 0.99 yuan/m3And (4) waste water.
To sum up, the domestic treatment process for the excrement and urine wastewater of the pig farm is mature at present, but the following problems exist: first, CODcr、BOD5Exceeding the standard; second is NH3-N is out of limits; thirdly, the running cost is high.
[ summary of the invention ]
In order to solve the problems, the invention provides a wastewater treatment method for a pig farm, which comprises rain and sewage separation treatment, dry and wet separation treatment, solid-liquid separation treatment and purification treatment, wherein the purification treatment comprises biological integrated wastewater treatment and biological pond purification treatment.
Preferably, the rain and sewage separation treatment is to design a sewage system of the pig farm to be a blind drain so as to prevent the mixing of rain water and excrement in a rainstorm period.
Preferably, the dry-wet separation treatment is to separate dry feces from sewage water in feces, and the sewage water comprises liquid in feces and washed water.
Preferably, the solid-liquid separation treatment is to perform solid-liquid separation on the sewage, so as to further reduce the content of organic solid wastes in the sewage.
Preferably, the biological integrated wastewater treatment comprises three steps of regulating the water quantity and homogenizing the water quality in a regulating tank, hydrolyzing organic matters in an acidification tank and degrading the organic matters in an oxidation tank.
Preferably, in the step of adjusting the water quantity and homogenizing the water quality in the adjusting tank, the sewage enters the adjusting tank to adjust and homogenize the water quantity and the water quality, so as to ensure the balance and stability of the water quantity and the water quality of a subsequent biochemical treatment system, and a pre-aeration system is arranged for oxygenation and stirring to prevent suspended particles in the sewage from precipitating.
Preferably, in the step of hydrolyzing the organic matters in the hydrolysis acidification tank, a three-dimensional elastic filler is arranged in the hydrolysis acidification tank to trap and adsorb particulate matters and colloidal matters in the sewage, and meanwhile, the insoluble organic matters are hydrolyzed into soluble matters by using hydrolytic bacteria.
Preferably, the oxidation pond consists of a pond body, a filling material, a water distribution device, an oxygenation aeration system and the like.
Preferably, the step of degrading organic matters in the oxidation pond is divided into two steps: firstly, under higher organic load, removing various organic substances in the sewage through the biochemical degradation and adsorption of the filler, and reducing the content of organic substances in the sewage; and the second part reduces the ammonia nitrogen in the sewage under the condition of sufficient oxygen amount and simultaneously reduces the COD value in the sewage to a lower level through the action of nitrifying bacteria under a lower organic load.
Preferably, in the step of the biological pond purification treatment, a filler is arranged in the biological pond purification tank, a large amount of microorganisms grow on the filler by artificial oxygen supply, and sewage is in contact with the microbial film growing on the surface of the filler in an interstitial manner, so that the sewage is purified and flows into the clean water tank.
The technical scheme of the invention is simpler to realize, has lower cost, compact treatment facilities, corrosion resistance, low noise, basically no peculiar smell and long service life, and can greatly save the occupied area and reduce the reaction time.
[ description of the drawings ]
The various aspects of the present invention will become more apparent to those of ordinary skill in the art after reading the detailed description of the invention in light of the accompanying drawings. Those skilled in the art will understand that: these drawings are only for the purpose of illustrating the technical solutions of the present invention in connection with the embodiments and are not intended to limit the scope of the present invention. Wherein,
FIG. 1 is a technical scheme of a method for treating wastewater from a pig farm according to an embodiment of the present invention.
[ detailed description ] embodiments
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 depicts a technical scheme of the method for treating wastewater from a pig farm according to the present invention. Referring to fig. 1, the method for treating wastewater in a pig farm adopts the following processes: rain and sewage separation treatment → dry-wet separation treatment → solid-liquid separation treatment → biological integrated wastewater treatment → biological pond purification treatment.
The method for treating the pig farm wastewater comprises the following steps:
step one, rain and sewage separation treatment: the building design of the pig farm is improved or reconstructed, and open ditch pollution discharge is modified into blind channel pollution discharge, so that the pig farm has an adjustable rain and sewage separation system design, high-pollution runoff rainwater in a rainstorm period is effectively separated, and rainwater and excrement are completely separated.
Step two, dry-wet separation treatment: and (3) carrying out dry manure cleaning on the pigsty, separating the dry manure from liquid, then flushing the pigsty, and mixing the flushing water and the liquid together to form sewage.
Thirdly, solid-liquid separation treatment: and the solid-liquid separation is carried out on the sewage, so that the content of organic solid wastes in the sewage is further reduced.
Fourthly, biological integrated wastewater treatment: the biological integrated wastewater treatment comprises three steps of regulating the water quantity and homogenizing the water quality in a regulating tank, hydrolyzing organic matters in an acidification tank and degrading the organic matters in an oxidation tank.
In the step of the homogenization of the regulating reservoir regulating water quantity and water quality, sewage enters the regulating reservoir after being treated by the grid well to be regulated and homogenized, the balance and stability of the water quantity and the water quality of a subsequent biochemical treatment system are ensured, the regulating reservoir is provided with a pre-aeration system for oxygenation and stirring, so that suspended particles in the sewage are prevented from precipitating and smelling, a certain degradation effect is achieved on organic matters in the sewage, and the impact resistance and the treatment effect of the whole system are improved.
In the step of hydrolyzing the organic matters in the hydrolysis acidification tank, the hydrolysis acidification tank is internally provided with a three-dimensional elastic filler, which provides a three-dimensional biological bed for bacteria and intercepts and adsorbs granular substances and colloidal substances in water. Meanwhile, under the action of hydrolytic bacteria, insoluble organic matters are hydrolyzed into soluble substances, and under the combined action of acid-producing bacteria, macromolecular substances and substances which are difficult to biodegrade are converted into small molecular substances which are easy to biodegrade, so that the BOD5/CODcr value is improved. The perforated aeration pipe is arranged in the pool, and the sewage is stirred, so that the sewage can be effectively controlled to be maintained in a hydrolysis acidification stage, and the biological membrane deposition caused by necrosis and falling can be prevented. The stop time of the sewage in the hydrolysis acidification tank is 4 hours, and the effective volume of the hydrolysis acidification tank is 2.5m3。
And in the step of overflowing the effluent of the hydrolysis acidification tank into a contact oxidation tank, the contact oxidation tank comprises a tank body, a filler, a water distribution device, an oxygenation aeration system and the like. The effluent of the hydrolysis acidification tank automatically flows into a contact oxidation tank. The organic load (BOD load) of the contact oxidation method is relatively high, the impact resistance is strong, and the effluent quality is stable. The contact filler adopts a three-dimensional elastic filler. The filler has good water flow characteristic, large specific surface area, easy film formation, difficult blockage and useThe service life is long. The biochemical tank adopts micropore aeration, and sewage is continuously circulated in the tank, so that the biological membrane on the filler and organic matters in the sewage are fully contacted and degraded. The aeration system adopts a perforated aeration pipe, and has the advantages of high oxygenation efficiency, uniform gas distribution and the like, and the gas-water ratio is designed to be 18: 1. The BOD load of the contact oxidation tank is designed to be 0.6KG/m3D, designed residence time of 10.6 hours, total effective contact oxidation tank volume of 21.5m3. The step of degrading organic matters in the oxidation pond of the contact oxidation pond comprises two steps: firstly, under higher organic load, removing various organic substances in the sewage through the biochemical degradation and adsorption of the filler, and reducing the content of organic substances in the sewage; and secondly, degrading ammonia nitrogen in the sewage under the condition of sufficient oxygen content and simultaneously reducing the COD value in the sewage to a lower level under the action of nitrobacteria under a lower organic load.
Fifthly, biological pond purification treatment: the biological pond purification treatment is a novel sewage treatment process organically combining a membrane separation technology and a biological treatment technology. Under the condition that the aeration pipe in the tank is continuously oxygenated by microorganisms in the activated sludge in the reactor, organic substances in water and dissolved oxygen are taken as nutrient sources, and the organic substances are decomposed into simple carbohydrates (CO2 and H2O) through metabolism of the microorganisms, so that the organic substances in the sewage are degraded. Meanwhile, membrane components with high-efficiency interception function are arranged in the reactor, and the membrane components can intercept active sludge and macromolecular organic substances in the biochemical reaction process into the reactor, so that solid-liquid separation is realized in the reactor, the concentration of the active sludge in the reactor can be gradually enhanced, the microbial activity is greatly improved, the degradation of organic pollutants is greatly facilitated, and the complete separation and the respective control of hydraulic retention time and sludge retention time are realized. The integrated membrane biological reaction system is provided with the self-suction type centrifugal clean water pump, water is sucked through the water pump, a negative pressure state is formed in the membrane, external sewage is intercepted outside the membrane component through the pressure difference between the interior of the membrane and the exterior of the membrane and the high-efficiency interception effect of the membrane component, pollutants in the sewage are intercepted outside the membrane component, clean water smoothly enters the membrane inner cavity through the membrane pore and is lifted through the self-suction water pump, and finally enters the clean water tank, so that the purposes of solid-liquid separation and sewage treatment are fulfilled.
The dry manure is cleaned and treated in the second step, the solid waste cleaned in the third step and the solid precipitates precipitated in the fourth step and the fifth step can be directly converted into organic fertilizers for production, and the organic fertilizers can be used for sale and farmland utilization. The finally purified clean water can be used again for washing the pigsty.
The invention can separate the water in the pig farm wastewater for reuse, and the cleaned solid matter can be used for generating organic fertilizer.
Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A method for treating wastewater in a pig farm is characterized by comprising the following steps: the method comprises rain and sewage separation treatment, dry-wet separation treatment, solid-liquid separation treatment and purification treatment, wherein the purification treatment comprises biological integrated wastewater treatment and biological pond purification treatment.
2. The method of treating wastewater from a pig farm according to claim 1, wherein the rain and sewage separation treatment is to design the sewage system of the pig farm as a blind drain to prevent mixing of rainwater and feces during heavy rain.
3. The method of claim 1, wherein the wet-dry separation process is a process of separating dry manure from sewage water in manure, the sewage water including liquid in manure and washed water.
4. The method of claim 3, wherein the solid-liquid separation treatment is a solid-liquid separation of the wastewater to further reduce the content of organic solid waste in the wastewater.
5. The method for treating the piggery wastewater according to claim 4, wherein the biological integrated wastewater treatment comprises three steps of adjusting the water quantity and homogenizing the water quality in the adjusting tank, hydrolyzing organic matters in the acidification tank and degrading the organic matters in the oxidation tank.
6. The piggery wastewater treatment method according to claim 5, wherein in the step of adjusting the water quantity and the water quality in the adjusting tank to be uniform, the wastewater enters the adjusting tank to be uniform in the water quantity and the water quality, so as to ensure the balance and stability of the water quantity and the water quality of a subsequent biochemical treatment system, and a pre-aeration system is arranged for oxygenation and stirring to prevent suspended particles in the wastewater from precipitating.
7. The method according to claim 5, wherein in the step of hydrolyzing organic substances in the hydrolysis acidification tank, the hydrolysis acidification tank is provided with a three-dimensional elastic filler to entrap and adsorb particulate and colloidal substances in the wastewater, and simultaneously, the insoluble organic substances are hydrolyzed into soluble substances by using hydrolytic bacteria.
8. The method of claim 5, wherein the oxidation tank comprises a tank body, a filler, a water distribution device, and an oxygen aeration system.
9. The method of claim 8, wherein the step of degrading organic matter in the oxidation pond comprises two steps: firstly, under higher organic load, removing various organic substances in the sewage through the biochemical degradation and adsorption of the filler, and reducing the content of organic substances in the sewage; and the second part reduces the ammonia nitrogen in the sewage under the condition of sufficient oxygen amount and simultaneously reduces the COD value in the sewage to a lower level through the action of nitrifying bacteria under a lower organic load.
10. The method for treating pig farm wastewater according to claim 9, wherein in the step of the biological pond purification treatment, a filler is provided in the biological pond purification tank, a large amount of microorganisms grow on the filler by artificial oxygen supply, and the sewage is contacted with the microbial film growing on the surface of the filler in an interstitial space, purified and flowed into the clean water tank.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104071952A (en) * | 2014-07-15 | 2014-10-01 | 厦门大学 | Biochemical film treating method for cultivation wastewater |
| CN104310740A (en) * | 2014-10-30 | 2015-01-28 | 朱安民 | Pollution discharge control process in scale-cultivation |
| CN104310722A (en) * | 2014-11-17 | 2015-01-28 | 武汉百安生物科技有限责任公司 | High-efficiency treating technology and device for waste water |
| CN104817241A (en) * | 2015-04-15 | 2015-08-05 | 柳州市大金农业科技有限公司 | Farm waste ecological treatment method |
| CN104844286A (en) * | 2015-04-14 | 2015-08-19 | 柳州市大金农业科技有限公司 | Pigeonry sewage ecological treatment method |
| CN105174604A (en) * | 2015-07-20 | 2015-12-23 | 常州市好利莱光电科技有限公司 | Method for treating pig farm wastewater through combination of stabilization ponds |
| CN105417920A (en) * | 2015-11-24 | 2016-03-23 | 贵港市港北区雁行养猪专业合作社 | Pig manure treating method and device |
| CN105836969A (en) * | 2016-05-14 | 2016-08-10 | 厦门史帝福环保科技有限公司 | Pig farm wastewater treatment method |
| CN106007311A (en) * | 2016-06-30 | 2016-10-12 | 宾阳县东洋养殖有限公司 | Environment-friendly ecological recycling method for pig manure |
| CN108975961A (en) * | 2018-09-18 | 2018-12-11 | 江苏省农业科学院 | A kind of high nitrate nitrogen biogas slurry preparation facilities and preparation method as mill water culture nutrient solution |
| CN109111047A (en) * | 2018-09-21 | 2019-01-01 | 苏州农业职业技术学院 | A kind of feces of farm isolation of purified processing method |
| CN116606040A (en) * | 2023-07-08 | 2023-08-18 | 中国电建集团华东勘测设计研究院有限公司 | Device and method for biochemical treatment of polluted rainwater by utilizing starch wastewater |
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| CN104310740A (en) * | 2014-10-30 | 2015-01-28 | 朱安民 | Pollution discharge control process in scale-cultivation |
| CN104310722A (en) * | 2014-11-17 | 2015-01-28 | 武汉百安生物科技有限责任公司 | High-efficiency treating technology and device for waste water |
| CN104844286A (en) * | 2015-04-14 | 2015-08-19 | 柳州市大金农业科技有限公司 | Pigeonry sewage ecological treatment method |
| CN104817241A (en) * | 2015-04-15 | 2015-08-05 | 柳州市大金农业科技有限公司 | Farm waste ecological treatment method |
| CN105174604A (en) * | 2015-07-20 | 2015-12-23 | 常州市好利莱光电科技有限公司 | Method for treating pig farm wastewater through combination of stabilization ponds |
| CN105417920A (en) * | 2015-11-24 | 2016-03-23 | 贵港市港北区雁行养猪专业合作社 | Pig manure treating method and device |
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| CN105836969A (en) * | 2016-05-14 | 2016-08-10 | 厦门史帝福环保科技有限公司 | Pig farm wastewater treatment method |
| CN105836969B (en) * | 2016-05-14 | 2019-01-18 | 厦门史帝福环保科技有限公司 | A kind of Wastewater from Pig Farm processing method |
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| CN108975961A (en) * | 2018-09-18 | 2018-12-11 | 江苏省农业科学院 | A kind of high nitrate nitrogen biogas slurry preparation facilities and preparation method as mill water culture nutrient solution |
| CN109111047A (en) * | 2018-09-21 | 2019-01-01 | 苏州农业职业技术学院 | A kind of feces of farm isolation of purified processing method |
| CN116606040A (en) * | 2023-07-08 | 2023-08-18 | 中国电建集团华东勘测设计研究院有限公司 | Device and method for biochemical treatment of polluted rainwater by utilizing starch wastewater |
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