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Removal of aromatic hydrocarbons (BTX) in anoxic and anaerobic wastewater treatment processes

机译：去除厌氧和厌氧废水处理过程中的芳烃（BTX）

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摘要

Benzene, toluene and xylenes (BTX) are a group of toxic and volatile aromatic compounds prevalent in many industrial wastewaters and they are often determined in municipal waste-water. Usually, BTX-containing wastewater is treated by conventional aerobic wastewater treatment process. However, the removal mechanisms are controversial since these compounds tend to be readily stripped from the aqueous phase to the atmosphere. On the other hand, their efficient removal is essential to reduce the subsequent disposal of such substances into the waters of the receiver. Batch tests with activated sludge process under anoxic and anaerobic conditions have been performed for assessment of the removal of specific organic contaminations BTX (benzene, toluene, and o- and p-xylene). The investigations were carried out in the laboratory anoxic reactors of 5L volume. The content of activated sludge (TSS) was 5g/L and concentrations of BTX in treated wastewater were in the range 0.25-2.37 mg/L of each of the compounds. The batch tests have showed enhanced BTX removal abilities under anoxic wastewater treatment. The rates of BTX removal in average: 0.214 mg/L d for benzene, 0.251 for toluene, 0.131 for o-xylene and 0.133 for p-xylene have been estimated. For anaerobic investigations the reactors of 2.5 L volume were used. The BTX removal under wastewater anaerobic digestion ranged from 28 to 63%.
机译：苯，甲苯和二甲苯（BTX）是许多工业废水中普遍存在的一组有毒和挥发性芳族化合物，通常在市政废水中进行测定。通常，通过常规的好氧废水处理工艺处理含BTX的废水。但是，去除机理存在争议，因为这些化合物往往易于从水相中剥离到大气中。另一方面，有效去除它们对于减少随后将此类物质丢弃到接收器的水中至关重要。已在缺氧和厌氧条件下使用活性污泥工艺进行了分批测试，以评估特定有机污染物BTX（苯，甲苯，邻二甲苯和对二甲苯）的去除情况。研究是在5L容量的实验室缺氧反应器中进行的。每种化合物的活性污泥（TSS）含量为5g / L，处理后的废水中BTX的浓度为0.25-2.37 mg / L。批次测试显示在缺氧废水处理下增强的BTX去除能力。 BTX的平均去除率：苯的估计值为0.214 mg / L d，甲苯的估计值为0.251，邻二甲苯的估计值为0.131，对二甲苯的估计值为0.133。对于厌氧研究，使用2.5 L体积的反应器。废水厌氧消化中BTX的去除率为28％到63％。

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