Study on Sludge Expansion During Treatment of Salad Oil Manufacturing Wastewater by Yeast
Study on Sludge Expansion During Treatment of Salad Oil Manufacturing Wastewater by Yeast
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DOI：
10.1080/09593332208618257
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发表时间：
2001-05
影响因子：
2.8
通讯作者：
S. Zheng;M. Yang;W. Lv;F. Liu
中科院分区：
文献类型：
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作者：
S. Zheng;M. Yang;W. Lv;F. Liu
从某色拉油厂的土壤中分离得到5株酵母菌，分别为红色红酵母、热带假丝酵母、产朊假丝酵母、博伊丁假丝酵母和皮肤丝孢酵母，并将其应用于色拉油生产废水的连续处理。混合培养物的油和COD去除性能与其他研究人员获得的结果相当。在污水连续处理过程中，污泥发生膨胀，并伴随着污泥形态由假菌丝体向真菌丝体的转变。以菌丝为主的污泥的含水率和SVI值远高于酵母纯培养物，但两种污泥的除油性能相似。从膨胀污泥中分离出一种霉菌，白地霉，怀疑是污泥膨胀的原因。向分批培养物中添加0.3%丙酸钠使SVI值从约100降低至60。在连续运行中，添加10 mg l−1次氯酸钠使SVI值从超过200降至低于100。然而，酵母活性在很大程度上被削弱。
Five yeast strains, namely Rhodotorula rubra, Candida tropicalis, Candida utilis, Candida boidinii, Trichosporon cutaneum, were isolated from soil spots of a salad oil factory, and applied for continuous treatment of salad oil manufacturing wastewater. The oil and COD removal performance of the mixed cultures were comparable to the results other researchers obtained. Sludge expansion, accompanied with sludge morphology change from pseudomycelia to true mycelia, occurred during continuous treatment of wastewater. The true mycelia dominated sludge had a much higher water content and SVI value than that of the yeast pure cultures, although the two kinds of sludge had similar oil removal performance. A mold, Geotrichum candidum, was isolated from the expanded sludge, and was suspected to be a reason for sludge expansion. Addition of 0.3% sodium propionate into batch cultures degraded SVI value from around 100 to 60. In a continuous running, addition of 10 mg l−1 sodium hypochlorite decreased SVI value from over 200 to below 100. The yeast activity, however, was weakened to a large extent at the same time.