[Acidification treatment of woolscouring effluent by using Acidophilic thiobacillus].
Suspended solids dispersed in woolscouring effluent (WSE) could be flocculated and precipitated in low pH. The aim of this study is to decrease pH in WSE, result in liquid-solid separation and remove COD of WSE through bio-acidification of Acidophilic thiobacillus. Acidophilic thiobacillus TS6 and sulfur powder as energy substance were inoculated and added into WSE for incubation in shaker at 180 r/min and 30 degrees C for 12 d. The results showed that suspended solids in WSE would flocculate and precipitate spontaneously and rapidly when pH in WSE drops to 3.00 due to bio-acidification. As a result, 91.4% of COD could be removed through consequent liquid-solid separation. Throughout the experiment, the control without inoculated with Acidophilic thiobacillus only led to 20% of COD removed. Furthermore, dewaterability of the sediment or dreg in bio-acidification treatment was enhanced markedly, as indicated by the decline of its specific resistance from more than 9.81 x 10(13) m x kg(-1) to 5.60 x 10(11) m x kg(-1). It seemed that bio-acidification approach might be an attractive treatment method for the organic wastewater of high wax content or high suspended solids content.
He
Feng
F
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. fhe@njau.edu.cn
Zhou
Li-Xiang
LX
Wang
Dian-Zhan
DZ
D042763:Acidithiobacillus / Q000378:metabolism*; D000143:Acids / Q000378:metabolism; D000818:Animals; D001673:Biodegradation, Environmental; D011232:Chemical Precipitation; D005427:Flocculation; D007220:Industrial Waste; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*; D014935:Wool
D000143:Acids; D007220:Industrial Waste