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Waster Water Treatment Wastewater Treatment In Different Types Of Farms

China as the world's largest pig breeding power, pig industry in the modern economic development occupies a pivotal position, but also brought a very challenging environmental pollution problems. A million pig farms on the row of manure sewage is very large, to purify these feces and waste water is more difficult, and after the long-term to meet the national sewage discharge standards require a lot of investment and high operating costs, also increased The cost of raising pigs.

If the problem of fecal pollution caused by these pig production can not be solved in time and effectively, it will restrict the development scale and pattern of the pig farm to a certain extent, which is more dangerous to ecological security. At present, the production focus has risen to People are generally concerned about the social problems.

The harm of pig farm farming wastewater

Fecal emissions from farms cause serious pollution of surface water, groundwater, soil and ambient air, which directly affects people's health and the untreated fecal matter contains a large amount of contaminants. If such organic wastewater is discharged directly Or with the rain washed into the rivers and lakes, a large number of water consumption in the dissolved oxygen, so that the water black hair smelly, causing water pollution.

Fecal water contains a lot of nitrogen, phosphorus and other nutrients is caused by water eutrophication is one of the important reasons, into the fish ponds and rivers to make organic matter pollution-sensitive aquatic organisms gradually die, in serious cases resulting in the loss of fish ponds and rivers Features.

Aquaculture of sewage for a long time into the ground, so that groundwater in the nitrate nitrogen or nitrite nitrogen concentration increased groundwater dissolved oxygen content decreased, toxic components increased, leading to deterioration of water quality, seriously endangering the water quality of the surrounding domestic water. High concentration of sewage can also lead to soil pore clogging, resulting in soil permeability, water permeability and consolidation, salinization, a serious reduction in soil quality, and even damage the crops, resulting in crop growth blocked or died.

Treatment of Piggery Wastewater

Pigs discharged from the sewage is organic sewage, the best anaerobic fermentation, but the treated effluent has not yet reached the best standards, can not be directly discharged, the right amount for farmland, fish ponds is an excellent nutrient solution. Therefore, the pig farm sewage treatment must be considered from the combination of biology and ecology, is the most economical and most effective breeding industry to promote the development of the best way.

At present, the treatment methods of large-scale pig farms at home and abroad mainly include comprehensive utilization and disposal of discharge standards. Comprehensive utilization is the biomass energy through the multi-level use, to create eco-agriculture and ensure the harmonious coexistence of agriculture and the environment of sustainable development, after the discharge standards are multi-level processing after the allowable emission concentration range can be discharged to the fish Ponds, farmland or orchards and other places can be used to maximize the extent possible to reduce environmental pollution.

Pretreatment method of pig farm wastewater

Pig farm farming wastewater regardless of what kind of technology and measures to deal with, should take a certain pretreatment method. The use of a pretreatment method reduces the load of the waste water contaminants in the subsequent treatment step while preventing large solids or debris from entering the subsequent treatment process, resulting in congestion or damage to the processing equipment. For the large particles in the fecal composition, pig farms can be used by precipitation, filtration and centrifugal solid-liquid separation technology to achieve pretreatment, common grille, sedimentation tanks and screens are in this category.

Precipitation is one of the most widely used methods in wastewater treatment, and the process of sedimentation and separation of suspended solids under gravity. At present, pig farms with waste water treatment facilities on the scale pig farm will basically be in series with 2-3 sedimentation tanks, and the fecal matter will be treated by filtration, precipitation and oxidative decomposition. In addition, there are some mechanical filtration equipment, including automatic drum filter, centrifugal disc separator can be used for pigsty fecal pretreatment steps.

Main processing technology of aquaculture wastewater

1, natural treatment

The use of nature (natural water, soil, etc.) on the principle of self-purification of sewage to play a role. Including land treatment systems and aquatic plant treatment systems. Commonly there are biological pond, soil treatment, artificial wetland treatment and so on.

Oxidation pond is the use of natural or artificial pond to carry out biological treatment of sewage. Sewage in the pond to stay a long time, and the water microbial metabolizable degradation of organic pollutants, dissolved oxygen through the algae photosynthesis and pond face reoxyeration to achieve, can greatly reduce the organic pollutants in water, and to a certain extent Remove the water in the nitrogen and phosphorus, to reduce water eutrophication.

Artificial wetland is a method of simulating natural biodiversity of natural wetland. It is a method of natural purification of water. It is composed of aquatic plants, crushed stone dust beds, microbial composition and sewage filtration, adsorption, replacement and other physical processes and microbial absorption and degradation And other biological effects, and ultimately achieve the purpose of water purification, it is also a kind of aerobic treatment. Can be used to waste or idle farmland, depression or pond to be transformed, but relatively large area, overload operation easily lead to blockage.

Natural processing is less economical and less costly, and is economical and affordable for small-scale farms, where adequate land is available for use.

2, artificial anaerobic treatment

Anaerobic treatment or biogas engineering Since the 1950s, a variety of treatment technologies have been developed, mainly for the development of a series of high-load reactors based on improved sludge concentration and improved wastewater-to-sludge mixing effects The

At present, the domestic pig farm wastewater treatment is mainly used in the upstream anaerobic sludge bed and riser solid reactor process. After anaerobic treatment of sewage, if available under the conditions of land can be used as liquid organic fertilizer to the field, but often relatively large emissions, transportation, application is not convenient, under normal circumstances subject to multi-level aerobic treatment After the standard discharge is appropriate

3, artificial aerobic treatment

The basic principle of aerobic treatment is the use of microorganisms in aerobic conditions decomposition of organic matter, while the synthesis of its own cells (activated sludge), biodegradable organic matter can be completely oxidized into a simple inorganic, including activated sludge, contact Oxidation and biological turntable.

4, anaerobic - aerobic treatment

Pig farms are more difficult to deal with organic wastewater, because of its large displacement, low temperature, solid and liquid mixed with waste water, organic matter content is high, nitrogen and phosphorus content is rich and easy to remove, simple use of physical, chemical or biological methods are Difficult to meet emission requirements.

Anaerobic method bod (biochemical oxygen demand) load, aerobic bod load is small, in the process of anaerobic treatment of sewage, the treated water still has a certain odor, the indicators do not necessarily meet the national emission standards The

In general, it is necessary to adopt a combination of a variety of processing methods, often using further aerobic treatment (oxidation pond, etc.) as an anaerobic treatment of secondary purification, which is currently dealing with high concentrations of organic wastewater a good way, It is also the wastewater treatment method used in many scale farms.

After the treatment of sewage can basically meet the national emission standards, but the final general set into the fish ponds, on the one hand through the fish pond to play the role of further oxidation pond, while algae reoxygenation to improve the dissolved oxygen content, promote phytoplankton, Animal and fish growth, the formation of nitrogen, phosphorus - algae - fish biological chain, reduce the environmental pollution of nitrogen and phosphorus.

Aquaculture wastewater treatment as a systematic project, need to follow the ecological principles, combined with a variety of treatment methods to form a comprehensive scientific use, to achieve the standard treatment after the use of pig farm water, effectively improve the breeding environment and reduce the threat to the surrounding environment.


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