Integrated ozone and biotreatment of pulp mill effluent and changes in biodegradability and molecular weight distribution of organic compounds

被引：91

作者：

Bijan, L ^{[1
]}

Mohseni, M ^{[1
]}

机构：

[1] Univ British Columbia, Dept Biol & Chem Engn, Vancouver, BC V6T 1Z4, Canada

来源：

WATER RESEARCH | 2005年 / 39卷 / 16期

基金：

加拿大自然科学与工程研究理事会;

关键词：

ozonation; biological treatment; integrated treatment; biodegradability; molecular weight distribution; recalcitrant organic matter;

D O I：

10.1016/j.watres.2005.07.018

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The overall effectiveness of integrating ozonation with biological treatment on the biodegradability enhancement and recalcitrant organic matter (ROM) removal from pulp mill alkaline bleach plant effluent was investigated. Ozonation was performed in a semi-batch bubble column reactor at pH of 11 and 4.5. Batch biological treatment was conducted in shake flasks. Samples obtained during the treatments were monitored for BOD5, COD, TOC, and molecular weight distribution. At an ozone dosage of 0.7-0.8mg O-3/mL wastewater, integrated treatment showed about 30% higher TOC mineralization compared to individual ozonation or biotreatment. Ozone treatment enhanced the biodegradability of the effluent (monitored as 21 % COD reduction and 13 % BOD5 enhancement), allowing for a higher removal of pollutants. The conversion of high molecular weight (HMW) to low molecular weight (LMW) compounds was an important factor in the overall biodegradability enhancement of the alkaline effluent. The overall biodegradability of the LMW compounds did not change over the course of ozonation, but it increased from 5% to 50% (measured as COD removal) for the HMW portion. Ozonation at pH of 11 was more effective than that at pH of 4.5 in terms of generating more biodegradable compounds. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：3763 / 3772

页数：10

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