Microwave enhanced Fenton-like process for the treatment of high concentration pharmaceutical wastewater
Microwave enhanced Fenton-like process for the treatment of high concentration pharmaceutical wastewater
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DOI：
10.1016/j.jhazmat.2009.02.038
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发表时间：
2009-08-30
影响因子：
13.6
通讯作者：
Liu, Yuan
中科院分区：
文献类型：
--
作者：
Yang, Yu;Wang, Peng;Liu, Yuan
本文探索了一种废水处理的新工艺，即微波增强类芬顿工艺。该新工艺用于处理高浓度制药废水，初始 COD 负荷为 49,912.5 mg L-1。考察操作参数，确定最佳条件为：微波功率300 W、辐射时间6 min、初始pH 4.42、H2O2投加量1300 mg·L-1、Fe-2(SO4)(3)投加量4900 mg·L-1。在本实验条件下，COD去除率和UV254去除率分别达到57.53%和55.06%，BOD5/COD从0.165提高到0.470。分子量分布的变化表明大分子物质和小分子物质均被很好地消除。絮体的结构表明，一种水合铁离子似乎通过范德华力和/或氢键与另一种水合铁离子和/或有机化合物分子连接形成大尺寸颗粒。随后，这些颗粒聚集形成絮凝物并沉降。与传统的类芬顿反应和传统的加热辅助类芬顿反应相比，微波增强类芬顿过程表现出优越的处理效率。微波有利于提高降解效率、提高污泥的沉降质量、降低污泥产量、增强出水的可生化性。微波增强类芬顿工艺被认为是一种很有前景的高浓度、难生物降解废水处理技术。 (C) 2009 Elsevier B.V. 保留所有权利。
This paper explored a novel process for wastewater treatment, i.e. microwave enhanced Fenton-like process. This novel process was introduced to treat high concentration pharmaceutical wastewater with initial COD loading of 49,912.5 mg L-1. Operating parameters were investigated and the optimal condition included as follows: microwave power was 300 W, radiation time was 6 min, initial pH was 4.42, H2O2 dosage was 1300 mg L-1 and Fe-2(SO4)(3) dosage was 4900 mg L-1, respectively. Within the present experimental condition used, the COD removal and UV254 removal reached to 57.53% and 55.06%, respectively, and BOD5/COD was enhanced from 0.165 to 0.470. The variation of molecular weight distribution indicated that both macromolecular substances and micromolecular substances were eliminated quite well. The structure of flocs revealed that one ferric hydrated ion seemed to connect with another ferric hydrated ion and/or organic compound molecule to form large-scale particles by means of van der waals force and/or hydrogen bond. Subsequently, these particles aggregated to form flocs and settled down. Comparing with traditional Fenton-like reaction and conventional heating assisted Fenton-like reaction, microwave enhanced Fenton-like process displayed superior treatment efficiency. Microwave was in favor of improving the degradation efficiency, the settling quality of sludge, as well as reducing the yield of sludge and enhancing the biodegradability of effluent. Microwave enhanced Fenton-like process is believed to be a promising treatment technology for high concentration and biorefractory wastewater. (C) 2009 Elsevier B.V. All rights reserved.