摘要
以浙江省某染料厂吸附染料生化废水饱和的活性炭为研究对象,采用Fenton试剂对其进行原位氧化再生,将再生后的活性炭用于同种废水的吸附。考察了再生时间、双氧水投加量、pH值、H2O2与Fe2+物质的量比、Fenton试剂投加方式等因素对再生吸附效果的影响,得到了活性炭再生的最佳条件。结果表明,Fenton原位氧化方法对活性炭再生具有较好的效果,当pH值为1、双氧水投加量为1 mL/g、H2O2与Fe2+物质的量为20∶1、再生时间为180 min时,再生炭重新吸附废水,COD和TOC再生率分别达到49.93%、36.80%。经再生活性炭吸附处理,出水可以达到部分工业回用水要求。为期半年的半工业试验表明,活性炭吸附效果与小试结果基本吻合。
In this paper, we would like to focus our study on the in situ oxidation regeneration mechanism of the used activated carbon and its application in the tertiary treatment of bio-effluents of dyestuff- making sewage by taking the dyestuff plant in Zhejiang as its case study sample. As is known, the activated carbon can be used in the tertiary treatment of biological effluents due to its well-developed pore structure, huge specific surface area and abundant surface oxygen groups. However, the activated carbon is needed to be regenerated when it is saturated, in which case, Fenton can be used as the reagent to regenerate the saturated activated carbon in situ. Both the regenerated activated carbon and the new activated carbon can be used to adsorb the same biological effluents of dyestuff-making sewage. For our research purpose, we have investigated the effects of regeneration time, the hydrogen peroxide dosage, pH value, the mo- lar ratio of hydrogen peroxide to Fe2 ~ , and the dosing manners on the results of the regeneration. What is more important, we have gained the optimal regeneration conditions for COD and TOC removal. The experimental results of ours indicate that Fenton reagents have very effective performance in regenerating the wasted activated carbon. According to COD and TOC removal results, the regeneration effi- ciencies of the used activated carbon can be made to reach 49.93 % （COD removal 36.45% ） and 36.80% （TOC removal 31.95% ） respectively at pH 1, 1 mL/g of H202, 20 ： 1 of the molar ratio of hy- drogen peroxide to Fe2 ＋ , and 180 rain of reaction time. Moreover, the fractionated dosing of the appropriate Fenton reagents displays a much more efficient regeneration rate. Thus, the treated effluent proves to be in conformity with the national reuse demand for the dyestuff-making process. In addition, the industrial pilot test we have done has also been verified successful as an item of laboratory experi- ment. Meanwhile, the regeneration cost is about 2 RMB/kg of the activated carbon. Thus, the Fenton oxidation regeneration can be re- garded as a reasonable and feasible technical renovation.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第1期193-197,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(21277023)
关键词
环境工程学
活性炭
再生
FENTON氧化
染料废水
深度处
理
中试
environmental engineering
activated carbon
regenera-tion
Fenton oxidation
dyestuff-making sewage
ad-vanced treatment
industry pilot test
