Wastewater treatment system suitable for small and medium size farms

Abstract

The invention relates to a wastewater treatment system suitable for small and medium size farms and a solid waste comprehensive treatment method. The system comprises a sedimentation basin, a regulating reservoir, an efficient filtering basin, a plant purifying pond and a composting field which are connected in sequence. The efficient filtering basin comprises a plurality of efficient filtering basin modules, wherein each efficient filtering basin module comprises a filtering basin cavity and filtering materials arranged in the filtering basin cavity. A water distributing system is arranged on the upper portion of the efficient filtering basin, a main water outlet pipe is arranged on the lower portion of the efficient filtering basin, and a discharging port is formed in the side face of the efficient filtering basin. The efficient filtering basin is filled with the efficient adsorption materials which serve as carriers, and the adsorption materials are porous materials and have very large surface area so that pollutants in wastewater can be easily adsorbed, and the anaerobic fermentation efficiency can be improved; by means of the design of the device, absorption saturated materials can be easily discharged and used, the materials obtained after absorption saturation can be used for producing organic fertilizer together with excrement of the farms, the fertilizer efficiency is improved, and waste is recycled.

Description

technical field [0001] The invention relates to a waste water treatment system suitable for small and medium farms, and belongs to the technical field of waste water treatment. Background technique [0002] In recent years, my country's large-scale and intensive livestock and poultry breeding industry has flourished, and the large-scale pig breeding has shown a trend of accelerated development, and the number of large-scale pig farms is also increasing. In 2010, my country's large-scale pig farms sold 332.623 million heads. While satisfying the supply of livestock products for people, it also caused serious pollution to the surrounding environment. Since many small and medium-sized pig farms have no sewage treatment measures, pig farms The surrounding sewage flowed horizontally, and the smell was even more unbearable, which seriously affected the normal life of the surrounding villagers. At present, most of the large-scale pig farms in my country adopt the water flushing pro...

AI Technical Summary

Problems solved by technology

In 2010, my country's large-scale pig farms sold 332.623 million heads. While satisfying the supply of livestock products for people, it also caused serious pollution to the surrounding environment. Since many small and medium-sized pig farms have no sewage treatment measures, pig farms The surrounding sewage is flowing horizontally, and the smell is even more unbearable, seriously affecting the normal life of the surrounding villagers

At present, most of the large-scale pig farms in my country adopt the water flushing process, which is more convenient and quick, but at the same time, the pig manure, feed residue and pig excrement will be washed together into the wastewater, so the wastewater contains a lot of According to statistics, if a pig farm with 10,000 pigs in stock adopts the water flushing process, the annual wastewater production volume is 109,600 tons, of which the COD concentration is as high as 3,000-10,000 mg / L, and the BOD 5 Concentration up to 1500~5000mg / L, NH 3 -N concentration can reach 200mg / L, SS concentration can reach as high as 3000~6000mg / L. In addition, pig farm wastewater also has a large impact load. The liquid is mixed with high viscosity, and the feces and feed residues contained in the wastewater are easy to block the pipelines of the treatment facilities, which increases the difficulty of treatment.

[0003] In recent years, some large-scale pig farms have been equipped with sewage treatment processes, such as UASB-SBR combined treatment process, etc., and the effluent can meet the discharge standards. However, the construction and operation costs of these processes are high, and some small and medium-sized pig farms cannot afford them. There is also a lack of wastewater treatment technology suitable for small and medium-sized pig farms

[0004] Chinese patent document CN201510063905.8 discloses a microaerobic biological treatment device for low C / N ratio dry cleaning pig farm wastewater and a method for treating pig wastewater. , Blower, Dissolved Oxygen Sensor, Air Volume Controller, Sludge Return Pump, etc. The control of this process is complicated and difficult, and it is not suitable for popularization and use in small and medium-sized pig farms.

Chinese patent document CN201410749016.2 discloses a biochemical treatment system for pig farm wastewater, which consists of a grid tank, a water collection and stirring tank, a solid-liquid separator, a primary sedimentation regulating hydrolysis acidification tank, an IC reactor, and a first-stage anoxic tank , the first carbon lye pool, the first aerobic pool, the intermediate sedimentation tank, the second anoxic pool, the second carbon lye pool, the second aerobic pool, the chemical pool, the phosphorus removal sedimentation pool, the acidification pool, and the oxygen It is composed of pond, disinfection pond and filler, and the effluent meets the discharge standard. However, the process is complex and difficult to operate and maintain. It is suitable for large-scale pig farm wastewater treatment

Chinese patent document CN201210584216.8 discloses a treatment process for high-concentration pig farm wastewater, which mainly uses a combination of secondary anaerobic and SBR processes to treat the pig farm wastewater. COD and NH4 in the treated wastewater + -N, SS, BOD5 and other indicators all meet the requirements of the "Discharge Standard for Livestock and Poultry Breeding Wastewater" (GB18596-2001), but the process requires high energy consumption due to aeration during operation

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