A large-scale pig farm wastewater advanced treatment system

Abstract

The invention provides a wastewater advanced treatment system for large-scale pig farms. The wastewater advanced treatment system comprises a grating well, wherein the grating well is connected with a water inlet pipe of a hydrolysis-acidification pool. A helical symmetric flow anaerobic reactor is connected with the hydrolysis-acidification pool and a gas inlet pipe of an integral sulfur-containing waste gas purification device, the integral sulfur-containing waste gas purification device is connected with a gas tank through a dehumidifier, and the gas tank is connected with a combined heat and power generation device. A drainage pipe of the helical symmetric flow anaerobic reactor is connected with a water inlet pipe of a sedimentation pool, a drainage pipe of the sedimentation pool is connected with a water inlet pipe of an SBR pool, and the hydrolysis-acidification pool is connected with the SBR pool through a bypass pipeline. An air blower is connected with the hydrolysis-acidification pool and the SBR pool, and a water outlet pipe of the SBR pool is connected with a water inlet pipe of a spiral-flow type crystallization and phosphorus removal reactor. A water outlet pipe of the spiral-flow type crystallization and phosphorus removal reactor is connected with a water inlet pipe of a biological filter, and a drainage pipe of the biological filter is connected with a water inlet pipe of a constructed wetland. The wastewater advanced treatment system has the advantages of being significant in wastewater treatment effect, low in cost, high in degree of automation and energy utilization rate, and suitable for wastewater treatment for the large-scale pig farms.

Description

technical field [0001] The invention relates to a wastewater biological treatment process, in particular to a large-scale pig farm wastewater advanced treatment system. Background technique [0002] According to the statistics of the State Environmental Protection Administration in 2013, the chemical oxygen demand (COD) discharged by the large-scale livestock and poultry breeding industry in 23 provinces (regions) and cities in the country reached 11.25 million tons, which is approximately equal to the COD discharge of industrial wastewater and domestic sewage. and. Pollution from livestock and poultry farms in many areas has become one of the major polluters in the area. Pig farm wastewater is the main source of poultry breeding wastewater. Its urine, feed residue, flushing water and domestic wastewater have high organic matter, nitrogen and phosphorus content (its COD can be as high as 5000-15000mg / L, ammonia nitrogen NH 3 -N can be as high as 500-1500mg / L, and total pho...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional pig farm wastewater treatment technology is mainly a combined process of hydrolytic acidification, anaerobic biological treatment and aerobic biological treatment, but the effluent is difficult to meet the Class I discharge in the "Discharge Standard of Pollutants for Animal Husbandry and Breeding Industry" (GB18596-2001) Standard (COD≤400mg / L, NH 3 -N≤80mg / L, P≤8mg / L)

Moreover, the effect of traditional process on phosphorus removal is not ideal

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