Fenton氧化与膜生物反应器处理硝胺生产废水

Fenton oxidation and membrane bioreactor for treatment ofnitramine production wastewater

在含能硝胺类化合物的生产过程中,会产生高盐度高毒性废水,无法采用传统的生物法直接处理。因此采用紫外光化与Fenton催化氧化进行预处理,对实际生产废水中的硝胺化合物先进行初步分解,然后将出水进入膜生物反应器,并筛选了六株高耐盐降解细菌与两株高耐盐降解真菌作为降解菌进行复合,最终实现废水的达标排放。由研究结果可知,Fenton催化氧化的最佳条件为:n(H_(2)O_(2))∶n(COD)=2.5∶1,n(H_(2)O_(2))∶n(Fe^(2+))=5∶1,pH=3.0。Fenton氧化工艺COD的去除率可以达到54%。筛选的特异降解菌株对硝胺类特征污染物具有较强的转化能力,转化率在70%以上,运行24 h后出水硝胺化合物的质量浓度≤0.1 mg/L。本研究为硝胺生产废水的处理提供了有效工艺,优化了相关参数并筛选了特异性降解菌,实现了废水的达标排放。

High-salinity and high-toxicity wastewater will be produced in the production of energetic nitramine,which cannot be directly treated by traditional biological method.Therefore,UV photochemical and Fenton catalytic oxidation were used for pretreatment,and the nitramine compounds in the actual production wastewater were initially decomposed.Then the effluent was treated by membrane bioreactor to achieve emission standards.In the meanwhile,six strains of high salt-tolerant bacterium and two strains of high salt-tolerant fungi were selected as the degradation microorganism.The results show that the optimum conditions of Fenton catalytic oxidation are:n(H_(2)O_(2))∶n(COD)=2.5∶1,n(H_(2)O_(2))∶n(Fe^(2+))=5∶1,pH=3.0.The COD removal rate in Fenton oxidation process can reach 54%.The screened-degradation microorganism have strong nitramine decomposition ability and the decomposition rate is more than 70%.The mass concentration of nitramine in effluent is less than 0.1 mg/L after running for 24 h.This study provides an effective process for the treatment of nitramine production wastewater.The relevant parameters are optimized and the specific degradation microorganisms are screened.The discharge of wastewater up to the standard can achieve.