Test study on integrated treatment of manure and wastewater for large scale pig farm

In the present paper, the anaerobic fermentation plus time delay aeration activated sludge method, together with the measure of putting in living beings was used to treat the manure and wastewater on large scale pig farm. The experimental results showed that by the treatment process, the death rate of helminthic was up to 99%, colon bacillus were not detected, the nutritional elements except for organic carbon were not lost. The manure treated reaches the environmental harmless standard requirement of scum in livestock and poultry breeding which is regulated in Discharge Standard of Pollutants for Livestock and Poultry Breeding(GB18596—2001). The removal ratios of COD_Cr, BOD₅, SS and NH₃-N separately reached high levels of 96.7%, 98.6%, 99.5% and 99.4%. The treated wastewater can reach the II series standard of Integrated Wastewater Discharge Standard(GB8978-1996).