郭绍东,李晨曦,黄兴虎,周龙,黄雨欣.次氯酸钠与亚铁对污泥破解及脱水效果的影响[J].环境科学学报,2021,41(8):3130-3137
次氯酸钠与亚铁对污泥破解及脱水效果的影响
- Effects of sodium hypochlorite and ferrous iron on sludge disintegration and dewatering
- 基金项目：大学生创新创业训练计划项目（No.201910488004）；国家自然科学基金（No.51808415）
- 郭绍东
- 武汉科技大学, 城市建设学院, 武汉 430065
- 李晨曦
- 武汉科技大学, 城市建设学院, 武汉 430065
- 黄兴虎
- 武汉科技大学, 城市建设学院, 武汉 430065
- 周龙
- 武汉科技大学, 城市建设学院, 武汉 430065
- 黄雨欣
- 武汉科技大学, 城市建设学院, 武汉 430065
- 摘要：采用次氯酸钠（NaClO）与亚铁（Fe（II））结合处理污泥以提高污泥破解和脱水效能，考察了NaClO和Fe（II）投加量的影响，并通过定量和定性分析污泥中胞外聚合物质（EPS）的迁移转化，确定NaClO和Fe（II）对污泥脱水和破解的机制.试验结果表明，NaClO和Fe（II）投加量（以干泥固体计）分别为44 mg·g-1和66 mg·g-1时，污泥毛细吸吮时间（CST）从原泥的112 s下降到66.3 s.同时，NaClO/Fe（II）处理污泥能够使上清液中化学需氧量（COD）显著升高，并使污泥中紧密束缚型EPS（TB-EPS）和松散束缚型EPS（LB-EPS）转化成溶解性EPS（S-EPS），导致S-EPS的溶解性有机碳（DOC）含量升高，而LB-EPS和TB-EPS的DOC含量降低.此外，NaClO/Fe（II）还能使污泥中有机物质矿化，使3种EPS中蛋白质类和腐殖酸类物质减少.NaClO和Fe（II）能够改善污泥脱水性能，强化污泥破解效果，利于污泥后续的处理处置.
- Abstract：The effects of NaClO and Fe(II) dosages on sludge disintegration and dewatering properties were investigated, and the underlying mechanism of this NaClO/Fe(II) conditioning was explored by analyzing the transformation of sludge extracellular polymeric substance (EPS). results showed that when NaClO and Fe(II) dosage were 44 mg·g-1 and 66 mg·g-1 drying solid, respectively, the capillary sucking time (CST) decreased from 112 s to 66.3 s for raw sludge. Moreover, chemical oxygen demand (COD) significantly increased in conditioned sludge supernatant, and tightly bound EPS (TB-EPS) and loosely bound EPS (LB-EPS) were transformed into soluble EPS (S-EPS) under NaClO/Fe(II) conditioning. As a result, dissolved organic carbon (DOC) of S-EPS increased while DOC of TB-EPS and LB-EPS decreased. In addition, the organic substances in sludge were mineralized by NaClO/Fe(II), resulting in the reduction of the protein and humic substances in the three EPSs. These results suggest that NaClO/Fe(II) could improve sludge dewaterability and disintegration efficiency, which is benefit to the subsequent sludge treatment and disposal.
