摘要
利用洗毛废水在低pH条件下,有机物絮凝沉降的特点,通过嗜酸性硫杆菌(Acidophilic thiobacillus)的产酸作用降低体系pH,破坏废水固有的稳定性,改变有机物的亲水性能,实现固液分离,达到去除COD的目的.试验结果表明,生物产酸作用能有效地去除废水COD,改善其脱水性能.当体系pH降至3.00,COD去除率达到最大值91.4%,处理后的废水有很好的机械脱水和沉降性能,比阻从大于9.81×1013m.kg-1降至5.60×1011m.kg-1.而对照处理在整个培养期内,未发生明显的改变,仅有20%的COD被去除.本研究为油脂含量高、难被生物利用的有机废水提供了一条新的处理方法.
Suspended solids dispersed in woolscouring emuent（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℃ 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 consoquent 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 × 10t^13m·kg^- 1 to 5.60 × 10^11 m· 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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第2期382-386,共5页
Environmental Science
基金
教育部新世纪优秀人才计划项目(NECT-04-0505)
江苏省建设厅科技重点项目(JS2004ZB05)
关键词
洗毛废水
生物产酸
嗜酸性硫杆菌
COD去除
woolscouring effluent
bio-acidification
Acidophilic thiobacillus
COD removal
