Abstract

Phytoremediation is one of the biological approaches for remediating textile dyeing effluents. The objective of this study is the use of Pistia stratiotes, an aquatic macrophyte, which was found to degrade the maximum of 83% of mixed azo dye. A phytoreactor was designed and constructed to scale up the process of phytoremediation by P. stratiotes to treat 40 mg/l of synthetic textile effluent. Continuous flow phytoreactor fed with 40 mg/l (cycle 1) which showed maximum decolorization of 84%, COD removal was about 61%, BOD which was reduced up to 71.9%, and TDS removal was about 72% respectively. Further to remove the residual color and toxic effects of the dyes, Phycoremediation was followed for the mixed azo dyes using the microalgae Chlorella vulgaris which showed a maximum decolorization of 99% in the batch study and 74% in the scale-up study where the treated effluent was at the most minimal discharge. Phytotoxicity tests showed 80% of germination in treated effluent, and the plants in untreated wastewater had inhibited growth that indicates only 30% of germination. Such combined biological treatment techniques were put forward to be the most eco-friendly technology, which is cost-effective and attain zero discharge of the textile effluent.

摘要

植物修复是修复纺织印染废水的生物方法之一。本研究的目的是使用Pistia Stratiotes，一种水生大型植物，被发现最多可降解 83% 的混合偶氮染料。设计并建造了一个植物反应器，以扩大P.striotes的植物修复过程，以处理 40  mg/l 的合成纺织废水。连续流植物反应器加入 40  mg/l（循环 1），显示最大脱色率为 84%，COD 去除率约为 61%，BOD 降低至 71.9%，TDS 去除率分别约为 72%。为了进一步去除染料的残留颜色和毒性作用，使用微藻对混合偶氮染料进行了Phycoremediation普通小球藻在批量研究中显示最大脱色率为 99%，在放大研究中显示最大脱色率为 74%，其中处理后的流出物排放最少。植物毒性试验表明，经过处理的污水中有 80% 的发芽率，而未经处理的污水中的植物生长受到抑制，表明只有 30% 的发芽率。这种组合生物处理技术被认为是最环保的技术，具有成本效益，实现纺织废水零排放。