Abstract

Due to water scarcity, storage and reuse of water has become a great challenge all over the world. The conventional methods for the wastewater treatment require large capital investment, operating cost, and need trained personal for supervision and maintenance. Therefore non conventional wastewater treatment methods have gained the popularity worldwide. Use of constructed wetland (CW) technology for wastewater treatment is highly efficient since CW are easy to construct, cost effective and increase the aesthetic value. Wetlands behavior and efficiency concerning wastewater treatment mainly depends upon macrophytes, substrate, hydrology, temperature and hydraulic retention time in the system. Present study deals with the removal of pollutants in two stage hybrid subsurface flow CW at different hydraulic retention times (HRT). The domestic wastewater was supplied to CW and treated using the available perennial macrophyte, Arundo donax. The system was run in replicate along with one control. To assess the removal efficiency of the pollutants, parameters like pH, temperature, dissolved oxygen (DO), total suspended solids (TSS), biological oxygen demand (BOD), chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) were analyzed at different HRT i.e., 36, 30 and 24 h. The result of the study observed maximum percentage removal of TSS, BOD, COD, and TKN was up to 84.61, 98.37, 61.39 and 91.87% respectively at 30 h of retention time.

中文翻译：

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不同水力滞留时间种植芦竹处理生活污水的混合潜流人工湿地评价

摘要

由于水资源短缺，水的储存和再利用已成为全世界面临的巨大挑战。传统的废水处理方法需要大量的资金投入和运行成本，并且需要经过培训的人员进行监督和维护。因此，非常规废水处理方法在世界范围内得到了普及。使用人工湿地 (CW) 技术进行废水处理是非常有效的，因为 CW 易于建造、具有成本效益并增加了美学价值。关于废水处理的湿地行为和效率主要取决于系统中的大型植物、基质、水文、温度和水力停留时间。目前的研究涉及在不同水力停留时间 (HRT) 的两级混合地下流 CW 中去除污染物。芦竹。该系统与一个对照一起重复运行。为了评估污染物的去除效率，分析了 pH、温度、溶解氧 (DO)、总悬浮固体 (TSS)、生物需氧量 (BOD)、化学需氧量 (COD) 和凯氏定氮总氮 (TKN) 等参数在不同的 HRT，即 36、30 和 24 小时。研究结果表明，保留时间为 30 小时时，TSS、BOD、COD 和 TKN 的最大去除率分别高达 84.61、98.37、61.39 和 91.87%。