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Evaluation of various pre-treatment processes on tannery sludge for enhancement of soluble chemical oxygen demand

机译：评估皮革厂污泥的各种预处理工艺以提高可溶性化学需氧量

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Overall sludge generation during the treatment of tannery wastewater is in the range of 18,200-165,200 tons per annum in India. One of the major problems faced by the tanning industry in India is the disposal of sludge. In recent years, increased attention has been given to minimization of waste sludge in wastewater treatment process. At present, each tannery is spending around Rs. 700-750 per ton for disposal of sludge into secured landfill facilities. Anaerobic digestion is one of the options for generation of biogas from primary and secondary sludge and to reduce sludge volume. In order to make anaerobic digestion more effective, pre-treatment of sludge before anaerobic digestion is the recent technological advancement employed to accelerate the rate of hydrolysis process. Various pre-treatment processes such as ozonation, sonication, hydrogen peroxide, alkaline, and alkaline thermal treatment were evaluated in the present study for increasing the soluble chemical oxygen demand separately in primary and secondary sludge generated during treatment of tannery wastewater. It was observed from the results obtained from the study that the increase in SCOD by various pre-treat-ments were in the order of ozonation ＞ alkaline thermal treatment ＞ sonication ＞ alkaline treatment ＞ hydrogen peroxide. The increase in the ratio of SCOD to TCOD by pre-treatments was effective for secondary sludge rather than primary sludge.
机译：在印度，制革废水处理期间的总污泥产生量为每年18,200-165,200吨。印度制革业面临的主要问题之一是污泥的处置。近年来，人们越来越重视废水处理过程中的污泥减少。目前，每个制革厂的支出约为卢比。每吨700-750美元，用于将污泥处置入固定的垃圾填埋场。厌氧消化是从一级和二级污泥产生沼气并减少污泥量的一种选择。为了使厌氧消化更有效，在厌氧消化之前对污泥进行预处理是加速水解过程速率的最新技术进步。在本研究中，评估了各种预处理工艺，例如臭氧化，超声处理，过氧化氢，碱性和碱性热处理，以分别提高制革废水处理过程中产生的一级和二级污泥中的可溶性化学需氧量。从该研究获得的结果中观察到，各种预处理对SCOD的增加顺序为臭氧化＞碱性热处理＞超声处理＞碱处理＞过氧化氢。通过预处理提高SCOD与TCOD的比率对于次生污泥而不是主要污泥有效。

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