1,4-二恶烷是可能的人类致癌物和持久性水生污染物。1,4-二恶烷的代谢生物降解是一种有前途的低成本和有效的处理技术;然而,垃圾渗滤液的处理需要进一步的论证。该技术在两个全尺寸移动床生物膜反应器(MBBR)中进行了测试,该反应器用四氢呋喃作为代谢物处理粗垃圾渗滤液。原始浸出液平均含有82μg/L的1,4-二恶烷,在测试之前,MBBR平均去除38%和42%的1,4-二恶烷,分别。首先,向MBBR1中加入四氢呋喃,1,4-二恶烷的去除率提高到平均73%,用对照MBBR去除平均37%的1,4-二恶烷。在此期间,确定了2mg/L四氢呋喃的最佳剂量。然后将四氢呋喃进料至两个MBBR,其中1,4-二恶烷的去除率平均为73%和80%。垃圾填埋场的代谢处理显着降低了下游废水处理和间接饮用水回用设施从垃圾填埋场接收的1,4-二恶烷的浓度,研究后,将1,4-二恶烷的负荷从44%降低到24%。实践要点:在MBBR中,用THF代谢降解渗滤液1,4-二恶烷是一种可行的处理技术,并且在改造现有的生物处理设施时是一种低成本的技术。MBBR可以在一定的温度范围内运行,除了添加THF之外,不需要任何操作更改,并且在THF与1,4-二恶烷的质量比为24的情况下操作最佳。1,4-二恶烷的源控制显着降低了下游废水处理厂和可饮用回用设施中1,4-二恶烷的浓度。
1,4-Dioxane is a probable human carcinogen and a persistent aquatic contaminant. Cometabolic biodegradation of 1,4-dioxane is a promising low-cost and effective treatment technology; however, further demonstration is needed for treating landfill
leachate. This technology was tested in two full-scale moving bed biofilm reactors (MBBRs) treating raw landfill
leachate with tetrahydrofuran selected as the cometabolite. The raw
leachate contained on average 82 μg/L of 1,4-dioxane and before testing the MBBRs removed an average of 38% and 42% of 1,4-dioxane, respectively. First, tetrahydrofuran was added to MBBR 1, and 1,4-dioxane removal was improved to an average of 73%, with the control MBBR removing an average of 37% of 1,4-dioxane. During this period, an optimal dose of 2 mg/L of tetrahydrofuran was identified. Tetrahydrofuran was then fed to both MBBRs, where the 1,4-dioxane removal was on average 73% and 80%. Cometabolic treatment at the landfill significantly reduced the concentration of 1,4-dioxane received from the landfill at a downstream wastewater treatment and indirect potable reuse facility, reducing the load of 1,4-dioxane from 44% to 24% after the study. PRACTITIONER POINTS: Cometabolic degradation of
leachate 1,4-dioxane with THF in MBBRs is a feasible treatment technology and a low-cost technique when retrofitting existing biological treatment facilities. The MBBRs can be operated at a range of temperatures, require no operational changes beyond THF addition, and operate best at a mass ratio of THF to 1,4-dioxane of 24. Source control of 1,4-dioxane significantly reduces the concentration of 1,4-dioxane in downstream wastewater treatment plants and potable reuse facilities.