摘要
采用电芬顿技术对抚顺市某市政污水处理厂浓缩池剩余污泥进行预处理,强化污泥的脱水性能。通过正交试验分析了电芬顿污泥强化脱水预处理技术的主要操作参数,确定了最佳工作条件,即p H值为3,曝气量为500 m L/min,电压梯度为2 V/cm;并通过极差与方差分析得出p H值为影响污泥脱水性能的主要参数。通过污泥含水率与脱水速率随时间的变化情况,分析得出最佳的电芬顿氧化处理时间为60 min,此时含水率能够降到68%。通过研究添加羟基自由基(·OH)清除剂后污泥的破坏效果以及·OH浓度与污泥破坏程度的关系,发现电芬顿污泥脱水的关键是产生的强氧化剂中间产物·OH。此外,污泥胞外聚合物(EPS)的浓度和组成在电芬顿氧化反应前后发生变化,紧密结合EPS(TB-EPS)量减少,可溶解性EPS(S-EPS)先增加后减少。
An electro-Fenton （EF） pretreatment technology was used to enhance the dewatering of the excess sludge from a. sewage treatment plant in Fushun. The operation parameters in the EF process were analyzed by changing the moisture content and specific resistance of sludge （SRF）. The results indicated that the optimized condition was pH of 3, aeration of 500 mL/min, and voltage gradient of 2 V/ cm. pH demonstrated a significant influence on the dewatering of sludge in the range and variance analysis. The moisture content reached up to 68% at the optimized condition of 60 minutes oxidation treatment. The hydroxyl radical （· OH） was identified as a key factor in the sludge dewatering process. Ad- ditionally, the concentrations and the compositions of the extracellular polymeric substance （EPS） were changing during the EF process. The concentrations of tightly bound EPS （TB-EPS） were decreasing, while the soluble EPS （S-EPS） concentrations were initially increasing and subsequently decreasing.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第3期116-121,共6页
China Water & Wastewater
基金
沈阳建筑大学博士后基金资助项目(SJZUBSH201720)
沈阳建筑大学学科涵育项目(XKHY2-117)
国家自然科学基金资助项目(51508342)
国家水体污染控制与治理科技重大专项(2014ZX07202-011)
关键词
电芬顿
剩余污泥
强化脱水
羟基自由基
胞外聚合物
electro-Fenton （EF）
excess sludge
enhanced dewatering
hydroxyl radical
extracellular polymeric substance
