本期目录
张斯玮,梁嘉林,黄锦佳,杨贤,黄绍松,孙水裕.缺氧酸化联合零价铁-过氧化氢改善污泥脱水性能的研究[J].环境科学学报,2019,39(3):780-789
缺氧酸化联合零价铁-过氧化氢改善污泥脱水性能的研究
- Effect of anoxic acidification combined with ZVI-H2O2 conditioning on sludge dewaterability
- 基金项目：广东省科技计划项目（No.2016A040403068）；广东省环保厅专项资金项目（2017）；佛山市科技创新项目（No.2016AG100482）
- 作者
- 单位
- 张斯玮
- 广东工业大学环境科学与工程学院, 广州 510006
- 梁嘉林
- 广东工业大学环境科学与工程学院, 广州 510006
- 黄锦佳
- 广东工业大学环境科学与工程学院, 广州 510006
- 杨贤
- 广东工业大学环境科学与工程学院, 广州 510006
- 黄绍松
- 广东工业大学环境科学与工程学院, 广州 510006
- 孙水裕
- 1. 广东工业大学环境科学与工程学院, 广州 510006;2. 广东环境保护工程职业学院, 佛山 528216;3. 广东工业大学资源综合利用与清洁生产省教育厅重点实验室, 广州 510006
- 摘要：为探讨缺氧酸化联合零价铁（ZVI）-过氧化氢（H2O2）调理对污泥脱水性能的影响，本文通过单因素试验，以污泥比阻（SRF）作为参考指标，系统考察了调理条件对污泥脱水性能的影响.同时，在试验的最佳调理条件下，分析了污泥各层胞外聚合物（EPS）有机物质量浓度及荧光光谱强度以阐明该联合作用机理.结果表明，当初始pH为2，ZVI投加量为280 mg·g-1（以干污泥量（DS）计，下同），缺氧时间为4 h，H2O2投加量为30 mg·g-1（以DS计，下同），类芬顿反应时间为10 min时，SRF降低了90.39%，处理效果较单独类芬顿处理提升了1倍.机理探究试验表明，在缺氧条件下，酸化处理可加速污泥的水解，溶解得到更多的二价铁离子，促使EPS结构发生改变；ZVI-H2O2调理可有效地氧化部分EPS，使得紧密结合胞外聚合物（TB-EPS）破解转化至松散结合胞外聚合物（LB-EPS）和上清液胞外聚合物（SB-EPS）.EPS分析结果表明，蛋白质的减少能有效提高污泥脱水性能，腐殖酸和富里酸类有机物的产生能提高污泥疏水性能.此外，ZVI的再次利用效率高，重复利用仍能使SRF降低率达到82.04%.因此，缺氧酸化联合ZVI-H2O2处理能实现污泥的水解、氧化和絮凝过程，达到改善污泥脱水性能的目的.
- Abstract：The effect of anoxic acidification combined with zero value iron (ZVI) and hydrogen peroxide (H2O2) on sludge dewatering performance was studied in this study. The sludge dewaterability was evaluated by specific resistance of sludge (SRF). Through single factor experiment, the optimum reaction conditions were obtained. The mechanism of combined treatment was clarified by analyzing the organic matter concentration and the fluorescence spectrum intensity of Extracellular polymeric substances (EPS). The results show that SRF decreased by 90.39% when optimal conditions are initial pH=2, ZVI=280 mg·g-1 dry sludge (DS), 4 h of anoxic process, 30 mg·g-1 DS dosage of H2O2, and 10 min reaction time. Compared with ZVI-H2O2 treatment alone, the SRF value obtained by the combined treatment is reduced by half. Meanwhile, the mechanism of ZVI-H2O2 type Fenton-like reaction system and the recovery of ZVI were also discussed. The results show that anoxic acidification accelerated the hydrolysis of sludge flocs, release of ferrous ion and the structure change on EPS. ZVI-H2O2 oxidation treatment decomposed part of EPS. As a result, organic materials in TB-EPS were broken and transferred into LB-EPS and SB-EPS. EPS analysis showed that the reduction of protein could effectively improve the dewatering performance. The production of humic acid and fulvic acid enhanced the hydrophobic property. Moreover, the effect on recovery and reutilization of ZVI is well, and the reduction rate of SRF still can reach 82.04%. In general, the combination treatment can achieve the process of sludge hydrolysis, oxidation and flocculation, thus improving the performance of sludge dewatering.
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