Study on septic tank nightsoil sludge reduction by bioaugmentation of EM and MCMP

Huang Chuan1 Wang Liao1 Song Zhenxia2 Gu Wei1 Ma Peidong1 Bao Liang1 Zhu Zhen3(1.College of Resources and Environmental Science,Chongqing University,Chongqing 400044,China;2.College of Biological and Chemical Engineering,Anhui Polytechnic University,Wuhu 241000,China;3.Chongqing Kunpeng Environment Engineering Co.Ltd.,Chongqing 400046,China)  

In order to investigate the effectiveness of bioaugmentation of effective microorganisms(EM) and multifunctional compound micro-organisms preparation(MCMP) on septic tank nightsoil sludge reduction,the septic tank nightsoil sludge was selected as the study object.An anaerobic digestion experiment at 35℃ was conducted to investigate the effects of the dosing quantity of EM and MCMP on the removal rate of total solid(TS),volatile solid(VS) and COD of septic tank nightsoil sludge;meanwhile,the correlation between dosing quantity of EM and MCMP and the removal rate of TS,VS and COD was also investigated.The results indicate that the suitable dosing quantity of EM and MCMP to reduce TS,VS and COD of septic tank nightsoil sludge is 0.005%~0.10%;among them 0.01% dosing quantity of EM and MCMP(E2 treatment and M2 treatment) show the best reduction effect of TS,VS and COD.The removal rates of TS,VS and COD of E2 treatment are 32.51%,42.34% and 40.91%,respectively;and 5.83%,5.29% and 7.13% higher than CK,respectively.The removal rates of TS,VS and COD of M2 treatment are 33.74%,46.05% and 43.33%,respectively;and 7.06%,9% and 9.50% higher than CK,respectively.The effect on TS,VS and COD reduction of septic tank nightsoil sludge anaerobic digestion are followed by MCMPEM.The relationships between the dosing quantity of EM and MCMP and the removal rate of TS,VS and COD are negative correlated;the relationships among the removal rate of TS,VS and COD are positive correlated under different dosing quantity of EM and MCMP.

【Key Words】： EM MCMP septic tank nightsoil reduction anaerobic digestion
【Fund】： 重庆市市政委资助项目(市政科2007-4)
【CateGory Index】： X703
【DOI】： CNKI:SUN:HJJZ.0.2010-07-039

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