Abstract

Common Effluent Treatment Plant (CETP) of eastern India leather complex have crucial ecological importance for its close proximity to Indian Sundarbans. Phytoplankton composition in relation to physico-chemical parameters was monitored over 1 year period on direct CETP effluent receiving stream. This stream meets with the Bidyadhari River which flows through the coastal parts of West Bengal and meets with the Bay of Bengal. 3 distinct zones (Upstream, Effluent, and Downstream) were chosen to assess the impact of CETP effluent on receiving stream. Chlorophyceae, Cyanobacteria, Bacillariophyceae, and Euglenophyceae were shown to be dominant in phytoplankton studies. Canonical Correspondence Analysis showed Euglenophyceae was related to most polluted Effluent whereas Bacillariophyceae was closer to least polluted Upstream. Patterns of both Simpson’s diversity index and Simpson’s dominance index clearly indicated alteration in phytoplankton community in the Downstream after mixing of CETP effluent. In contrast to downstream, where pollution was more prevalent (COD 40 mg/dm³) and species diversity was lower (Simpson’s diversity index 6), upstream had lower pollution levels (12 mg/dm³) and more species diversity (15). Discriminant Analysis also supported the above-mentioned fact. The eutrophic condition in the downstream zone is indicated by higher species dominance values (Simpson’s dominance index 0.15) and rich nutrient loads.

中文翻译：

---

制革厂废水处理厂废水对流向印度-孙德尔本斯的接收河流中浮游植物群落的影响

摘要

印度东部皮革厂的公共污水处理厂 (CETP) 因其靠近印度孙德尔本斯地区而具有至关重要的生态重要性。在直接 CETP 流出物接收流上对浮游植物组成与物理化学参数的关系进行了一年多的监测。这条溪流与流经西孟加拉邦沿海地区的比迪亚达里河 (Bidyadhari River) 汇合，最后汇入孟加拉湾。选择 3 个不同的区域（上游、污水和下游）来评估 CETP 污水对接收流的影响。绿藻纲、蓝藻纲、硅藻纲和裸藻纲在浮游植物研究中占主导地位。规范对应分析显示，裸藻纲与污染最严重的污水相关，而硅藻纲则更接近污染最少的上游。辛普森多样性指数和辛普森优势指数的模式清楚地表明CETP污水混合后下游浮游植物群落的变化。与下游相比，污染更为普遍（COD 40 mg/dm ³）且物种多样性较低（辛普森多样性指数 6），上游污染水平较低（12 mg/dm ³）且物种多样性较高（15）。判别分析也支持了上述事实。下游区域的富营养化状况表现为较高的物种优势值（辛普森优势指数0.15）和丰富的营养负荷。