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首页> 外文期刊>Journal of Environmental Science and Health >Evaluation of waste activated sludge as a coagulant aid for the treatment of industrial wastewater containing mixed surfactants
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Evaluation of waste activated sludge as a coagulant aid for the treatment of industrial wastewater containing mixed surfactants

机译：评价废旧活性污泥作为助凝剂处理含混合表面活性剂的工业废水

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摘要

Wastewater generated by the industry manufacturing detergents and various kinds of consumer products normally contains very high contents of mixed surfactants, organic matters expressed as chemical oxygen demand (COD), and phosphates that must be treated prior to discharge to the aquatic environment. In this study, jar-test experiments were conducted to evaluate the waste activated sludge (WAS) as a coagulation aid in the coagulation-flocculation process with ferric chloride or aluminum sulfate as a coagulant for the treatment of wastewater collected from the aforementioned industry. The WAS was selected because of its adsorption capability of anionic surfactants and its availability from the wastage stream of biological wastewater treatment process. The effective dosages of both coagulants with and without the WAS additions were determined in this study. Without the WAS addition, the concentrations of 800 mg/L aluminum sulfate at the optimum pH value of 8 and 2208 mg/L ferric chloride at the optimum pH value of 12 were the optimum chemical dosages. It appears that aluminum sulfate was more effective than ferric chloride based on the chemical dosage and removal efficiency. The turbidity, suspended particles, anionic surfactants, COD, and phosphates removal efficiencies of aluminum sulfate and ferric chloride under the optimum dosage were 95.6, 88.2, 78.4, 73.5, 47.3% and 98.8, 92.0, 72.7, 67.5, 53.1%, respectively. The addition of 200 mg/L WAS was sufficient to reduce the optimum dosages of both chemicals by 200 mg/L. The cationic surfactant existing in the wastewater worked as a flocculating agent leading to the flocculation of waste activated sludge resulting in the enmeshment of the suspended particles and colloids on which the COD, anionic surfactants, and phosphates were adsorbed. However, the substances removal efficiencies of ferric chloride and aluminum sulfate were slightly enhanced and reduced, respectively. It is possibly explained that the settling time is insufficient to settle the aluminum hydroxide floe when it is compared to the ferric hydroxide floe because the iron floe is normally heavier than the alum floe.
机译：由制造洗涤剂和各种消费品的工业产生的废水通常包含非常大量的混合表面活性剂，表示为化学需氧量（COD）的有机物和必须排放至水生环境之前必须进行处理的磷酸盐。在这项研究中，进行了广口瓶试验，以评估在氯化铁或硫酸铝作为混凝剂的混凝-絮凝过程中作为混凝助剂的废活性污泥（WAS），用于处理从上述行业收集的废水。选择WAS是因为它具有阴离子表面活性剂的吸附能力以及可从生物废水处理过程的浪费流中获得。在这项研究中确定了添加和不添加WAS两种凝结剂的有效剂量。在不添加WAS的情况下，最佳pH值为8的800 mg / L硫酸铝和最佳pH值为12的2208 mg / L氯化铁是最佳化学剂量。基于化学剂量和去除效率，看来硫酸铝比氯化铁更有效。在最佳剂量下，硫酸铝和氯化铁的浊度，悬浮颗粒，阴离子表面活性剂，化学需氧量和磷酸盐去除率分别为95.6、88.2、78.4、73.5、47.3％和98.8、92.0、72.7、67.5、53.1％。添加200 mg / L WAS足以将两种化学品的最佳剂量减少200 mg / L。废水中存在的阳离子表面活性剂用作絮凝剂，导致废物活化污泥的絮凝，导致悬浮的颗粒和胶体相互啮合，并吸附了COD，阴离子表面活性剂和磷酸盐。但是，氯化铁和硫酸铝的物质去除效率分别略有提高和降低。可能的解释是，与氢氧化铝铁絮凝物相比，沉降时间不足以使氢氧化铝絮凝物沉降，因为铁絮凝物通常比明矾絮状物重。

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