Effect of dechlorane plus on acid production and physical-chemical properties during waste activated sludge anaerobic fermentation after thermo-alkaline pretreatment
1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China; 2. Qingdao Solid Waste Pollution Control and Resource Engineering Research Center, Qingdao 266033, China
Abstract：In order to explore the effect of emerging contaminates Dechlorane Plus (DPs) on acid production and sludge characteristics during waste activated sludge (WAS) anaerobic fermentation, WAS and DPs were investigated as objects to establish a sequential batch reactor, which was explored under medium temperature. The results showed DPs had a significant inhibitory effect on anaerobic fermentation of sludge to produce short-chain fatty acids (SCFA), and when DPs content was 300.0mg/kg TSS, the maximum output of SCFA was only 151.2mg COD/g VSS, which was 0.7times of that in the blank. The presence of DPs will affect the physical and chemical properties of WAS, since DPs will promote the process of sludge cracking, but the hydrolysis and acidification processes were inhibited, and the inhibitory effect became more obvious as the increase of DPs dosage. DPs also inhibit the release of organic matters, when DPs content is 300.0mg/kg TSS, the maximum concentration of SCOD is only 0.74times of that in the blank, the concentration of soluble protein and soluble polysaccharide is also significantly lower than that in the blank. In addition, DPs also affect the release of NH4+-N and PO43--P, high dosage of DPs promote the release of NH4+-N and PO43--P.
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