|
Livestock and poultry wastewater hazards and the status quo of domestic and international livestock and poultry wastewater treatment are briefly summarized for domestic such high concentration organic wastewater treatment method than a single , high processing costs , the majority of craft merely the test stage phenomenon , with a main process swine wastewater UASB-SBR , investigated UASB reactor startup process and operating results , and to explore the impact of different factors on the UASB reactor treating swine wastewater effect : study SBR optimum process conditions and the impact of different factors on the treatment effect of the reactor , the optimum process parameters, and the above results guide the engineering practice . Experimental research and engineering examples show : 1.UASB treatment , more than 85% COD removal SBR COD, NH 3 -N removal rates were about 85% and 93% ; The treated effluent to meet pollutant emission standards for livestock and poultry industry . Of 2.UASB reactor after more than two months of operation , the final volume load reaches 6.61kgCOD / ( m 3 < / sup> . D ) . The The COD removal in organic load 7.52 kgCOD / ( the m 3 d ) below , COD removal with increasing organic load slowly increasing With the further increase of the organic load , there downward trend , COD removal decreased from 87.7 % to 64.7% . Therefore , the control of the organic load and is very necessary . Finalized . Comparative test different reaction periods : time to maintain the various conditions in the SBR were water 0.5h , the aeration 6.5h , hypoxia stirring 1.5h, precipitation 2h better drainage 0.5h processing . The final effluent COD and NH 3 -N concentrations were 200-250mg / L and 75 - 80mg / L . The actual processing of the project better , and acceptance by the environmental protection department , SBR final effluent COD to 262.5mg / L NH 3 - N to 70.5 mg / L , TP of 3.2 mg / L for SS 1.3mg / L, to achieve the requirements of the pollutant emission standards for livestock and poultry industry .
|