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商业纺织单宁的预臭氧化:对生物降解性和毒性的影响。

Pre-ozonation of commercial textile tannins: effects on biodegradability and toxicity.

作者信息

Koyunluoglu Sebnem, Arslan-Alaton Idil, Eremektar Gulen, Germirli-Babuna Fatos

机构信息

Department of Chemical Engineering, Faculty of Engineering and Architecture, Yeditepe University, Istanbul, Turkey.

出版信息

J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006;41(9):1873-86. doi: 10.1080/10934520600779083.

Abstract

The effect of ozonation on the biodegradability and acute toxicity of two frequently used textile dye assisting chemicals, namely natural tannin (NT) having an initial chemical oxygen demand (COD0) of 1195 mg L-1; initial total organic carbon (TOC0) of 342 mg L-1; initial 5th-day biochemical oxygen demand (BOD5,0) of 86 mg L-1; initial ultraviolet absorbance at 280 nm wavelength (UV280,0) of 32.2 cm-1; initial ultraviolet absorbance at 254 nm wavelength (UV254,0) of 19.35 cm-1 and synthetic tannin (ST); with a COD0 of 465 mg L-1; TOC0 of 155 mg L-1; BOD5,0 of 6 mg L-1; UV280,0 of 11.78 cm-1; UV254,0 of 13.74 cm-1 was investigated. Synthetic wastewater bearing these tannin formulations was individually prepared and subjected to ozonation at varying doses (500 and 1000 mg h-1), and pHs (3.5 and 7.0) to elucidate the effect of ozone dose and pH on oxidation efficiency. Changes in the environmental sum parameters chemical oxygen demand (COD), total organic carbon (TOC), 5th-day biochemical oxygen demand (BOD5), ultraviolet absorbance at 280 nm wavelength (UV280) and ultraviolet absorbance at 254 nm wavelength (UV254), the latter two representing the aromaticity and double bonds of the studied textile tannins, respectively, were monitored during the course of ozonation. In the second part of the study, the biodegradability and acute toxicity of the raw and pre-ozonated textile tannins were evaluated in terms of the BOD5 parameter and an activated sludge inhibition test, respectively. Results indicated no significant changes in acute toxicity for NT, whereas the inhibitory effect of ST could be completely eliminated after 40 min ozonation at a rate of 1000 mg h-1 (i.e., at a specific ozone dose of 1.4 mg (O)3 (mg COD0)-1 and a pH of 3.5. In conclusion, pre-ozonation appeared to be potential pretreatment option to achieve complete detoxification and a fair biodegradability improvement of the otherwise refractory synthetic tannin.

摘要

研究了臭氧化对两种常用纺织印染助剂化学品的生物降解性和急性毒性的影响,这两种化学品分别是初始化学需氧量(COD0)为1195 mg L-1、初始总有机碳(TOC0)为342 mg L-1、初始第5日生化需氧量(BOD5,0)为86 mg L-1、初始280 nm波长紫外吸光度(UV280,0)为32.2 cm-1、初始254 nm波长紫外吸光度(UV254,0)为19.35 cm-1的天然单宁(NT),以及COD0为465 mg L-1、TOC0为155 mg L-1、BOD5,0为6 mg L-1、UV280,0为11.78 cm-1、UV254,0为13.74 cm-1的合成单宁(ST)。分别配制含有这些单宁制剂的合成废水,并以不同剂量(500和1000 mg h-1)和pH值(3.5和7.0)进行臭氧化处理,以阐明臭氧剂量和pH值对氧化效率的影响。在臭氧化过程中,监测环境综合参数化学需氧量(COD)、总有机碳(TOC)、第5日生化需氧量(BOD5)、280 nm波长紫外吸光度(UV280)和254 nm波长紫外吸光度(UV254)的变化,后两者分别代表所研究纺织单宁的芳香性和双键。在研究的第二部分,分别根据BOD5参数和活性污泥抑制试验评估了未处理和预臭氧化处理的纺织单宁的生物降解性和急性毒性。结果表明,NT的急性毒性没有显著变化,而在1000 mg h-1的速率下(即特定臭氧剂量为1.4 mg (O)3 (mg COD0)-1且pH值为3.5)臭氧化40分钟后,ST的抑制作用可完全消除。总之,预臭氧化似乎是一种潜在的预处理方法,可实现完全解毒,并显著提高原本难降解的合成单宁的生物降解性。

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