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Ceramic membrane-based ultrafiltration combined with adsorption by waste derived biochar for textile effluent treatment and management of spent biochar
Journal of Environmental Health Science and Engineering ( IF 3.4 ) Pub Date : 2020-08-19 , DOI: 10.1007/s40201-020-00520-w
Bhaskar Santra 1, 2 , Lata Ramrakhiani 1 , Susmita Kar 1, 2 , Sourja Ghosh 1, 2 , Swachchha Majumdar 1
Affiliation  

Purpose

Effluents produced in the textile industries are important sources of water pollution due to the presence of toxic dyes, auxiliary chemicals, organic substances etc. Recycling of such industrial wastewater is one major aspect of sustainable water management; hence present study is focused on an eco-friendly process development for reclamation of higher loading textile wastewater.

Method

Industrial effluent samples with varying loading were collected from textile processing units located in and around Kolkata city. Vegetable waste collected from local market was utilized to prepare an efficient biochar for elimination of the recalcitrant dyes. Prior to adsorption, ceramic ultrafiltration (UF) process was used for reduction of the organic loading and other suspended and dissolved components.

Results

A remarkably high BET surface area of 1216 m2g−1 and enhanced pore volume of 1.139 cm3g−1 was observed for biochar. The maximum adsorption capacity obtained from the Langmuir isotherm was about 300 mg.g−1. The combined process facilitated >99% removal of dyes and 77–80% removal of chemical oxygen demand (COD) from the various samples of effluent. The treated effluent was found suitable to discharge or reuse in other purposes. About 95% of dye recovery was achieved during biochar regeneration with acetone solution. The dye loaded spent biochar was composted with dry leaves and garden soil as bulking agent. Prepared compost could achieve the recommended parameters with high nutritional value after 45 days.

Conclusions

The overall study showed potential of the proposed process towards treatment of toxic dye loaded textile effluent in an environment friendly and sustainable approach.



中文翻译:

基于陶瓷膜的超滤结合废弃物衍生生物炭吸附用于纺织废水处理和废生物炭管理

目的

由于存在有毒染料、辅助化学品、有机物质等,纺织工业产生的废水是水污染的重要来源。回收此类工业废水是可持续水管理的一个主要方面;因此,本研究的重点是开发高负荷纺织废水回收利用的环保工艺。

方法

从位于加尔各答市及其周边的纺织加工单位收集了不同负荷的工业废水样品。从当地市场收集的蔬菜废物被用来制备一种高效的生物炭,以消除顽固的染料。在吸附之前,使用陶瓷超滤 (UF) 工艺来减少有机负载和其他悬浮和溶解的成分。

结果

对于生物炭,观察到1216 m 2 g -1的显着高 BET 表面积和 1.139 cm 3 g -1的增强孔体积。从朗缪尔等温线获得的最大吸附容量约为 300 mg.g -1。联合过程有助于从各种流出物样品中去除 >99% 的染料和 77-80% 的化学需氧量 (COD)。处理后的污水被发现适合排放或再用于其他用途。在用丙酮溶液再生生物炭的过程中,染料回收率达到了大约 95%。负载染料的废生物炭与干叶和花园土壤作为填充剂进行堆肥。制备好的堆肥可在 45 天后达到推荐参数,具有较高的营养价值。

结论

总体研究表明,所提出的工艺在以环境友好和可持续的方式处理有毒染料的纺织废水方面具有潜力。

更新日期:2020-08-19
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