Constitute Analysis of the Dissolved Organic Carbon from Sewage Effluent of SBR: the Impact of pH Value
pH值对SBR生物反应器出水溶解态有机质含量与构成的影响

To discuss the characteristics of effluent organic matter (EfOM) from biologically treated sewage effluent, the impact of pH value on SBR was originally evaluated with an artificial wastewater. The results revealed that dissolved organic matter (DOM) from SBR was greatly influenced by pH value. When pH value of the SBR with original pH of 6.5 was decreased to 6.0, DOC of its effluent gradually increased from its original 4.0 mg·L-1. Further increasing pH can alleviate this increase. For the SBR with original pH of 8.0, DOC of effluent decreased rapidly from its original 4.0 mg·L-1 to 2 mg·L-1, while further decreasing pH to 6.5 did not affected this. Tannin and soluble microbial products (SMPs) including protein, carbohydrate and DNA consist to the main part of DOM in the sewage effluent. The pH value had a long-term impact on the formation of SMPs. Decreasing pH will result in its gradual increase. The impact of pH value on anaerobic process dominated the DOM degradation during the operation period. Higher pH value was helpful for the degradation of DOM.