CASE
A pig wastewater treatment project in Changde, Hunan
A pig wastewater treatment project in Changde, Hunan
A pig wastewater treatment project in Changde, Hunan
A pig wastewater treatment project in Changde, Hunan

A pig wastewater treatment project in Changde, Hunan

The wastewater from a pig farm in Changde, Hunan mainly includes pig urine, some pig manure, and pig house flushing water. It is a high concentration organic wastewater with high suspended solids and ammonia nitrogen content.

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案例详情

1、 Project Overview
The wastewater from a pig farm in Changde, Hunan mainly includes pig urine, some pig manure, and pig house flushing water. It is a high concentration organic wastewater with high suspended solids and ammonia nitrogen content. The pig farm is equipped with 3000 sows and an annual output of 60000 piglets. The cleaning method is water soaked manure, and the designed treatment capacity of the sewage treatment station is 300m3/d. The combined process of solid-liquid separation, air flotation, UASB, aerobic+sedimentation, chemical phosphorus removal, and disinfection is adopted. The effluent meets the "Pollutant Discharge Standards for Livestock and Poultry Breeding Industry" (GB18596-2001). The raw water quality and discharge standards are shown in the table below:

 

project COD（mg/L） BOD5（mg/L SS（mg/L） Ammonia nitrogen (mg/L) Total phosphorus (mg/L) Number of fecal coliforms (per 100ml)
Raw water quality 15000 8000 4000 1200 45

108
emission standard 400 150 200 80 8 1000

 

Design process
Hydrolysis acidification: The biodegradability of wastewater is not high. Hydrolysis acidification is used to decompose complex organic pollutants that are difficult to degrade into simple organic compounds that are easy to degrade, thereby improving the biodegradability of wastewater;
Contact oxidation: After hydrolysis and acidification, the biodegradability of wastewater is improved, and aerobic microorganisms in activated sludge are used to oxidize easily degradable organic substances in wastewater into CO2 and H2O;
Coagulation sedimentation: PAC and carbon powder are added to the coagulation reaction tank, and the adsorption of activated carbon and the coagulation sedimentation effect of PAC are used to further remove organic substances in the wastewater. The sedimentation tank adopts inclined tube sedimentation, which is used for the sedimentation and separation of precipitates and flocs;
Bleaching: Add sodium hypochlorite to the bleaching tank and use a metering pump for quantitative dosing, with a dosage of 100mg/L.