含邻苯二甲酸酯污水污泥的超声-碱化预处理。

Sono-alkalization pretreatment of sewage sludge containing phthalate acid esters.

机构信息

Department of Environmental Engineering and Health, Yuanpei University, Hsinchu, Taiwan.

出版信息

J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(9):980-8. doi: 10.1080/10934529.2011.586261.

DOI:10.1080/10934529.2011.586261

Abstract

This work experimentally elucidates the efficiencies of sono-alkalization treatment on municipal sewage sludge. The total solids (TS) concentration of the sewage sludge was pre-adjusted at 29.7 g/L. Two parameters such as sodium hydroxide (NaOH) dosage and sonication time were considered by the central composite design (CCD) program to investigate the effect on the degradation of phthalate acid esters (PAEs) and solubilization of soluble chemical oxygen demand (SCOD). The mean concentrations of dibutyl phthalate (DBP), di-(2-ethylhexyl) phthalate (DEHP) and butyl benzyl phthalate (BBP) in the sewage sludge were 718, 41 and 8 mg/kg dry weight sludge, respectively. Sono-alkalization process was effective on the degradation of DBP but worthless for DEHP and BBP. Overall degradation of DBP in sewage sludge was estimated to be 100% at the NaOH dosage of 68 m Mand sonication time of 2.2 min. Sono-alkalization was responsible for 6,000 mg/L increase of SCOD based on the decrease of volatile solids in sewage sludge.

摘要

本工作通过实验阐明了超声碱处理对城市污水污泥的效能。污水污泥的总固体（TS）浓度预先调整为 29.7 g/L。通过中心复合设计（CCD）程序考虑了氢氧化钠（NaOH）用量和超声时间这两个参数，以研究它们对邻苯二甲酸酯（PAEs）降解和可溶性化学需氧量（SCOD）溶出的影响。污水污泥中邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二（2-乙基己基）酯（DEHP）和邻苯二甲酸丁基苄基酯（BBP）的平均浓度分别为 718、41 和 8 mg/kg 干重污泥。超声碱处理过程对 DBP 的降解有效，但对 DEHP 和 BBP 无效。在 NaOH 用量为 68 m 和超声时间为 2.2 min 的条件下，污水污泥中 DBP 的总体降解率估计为 100%。基于污水污泥中挥发性固体的减少，超声碱处理使 SCOD 增加了 6000 mg/L。