Abstract

The conventionally used constructed wetlands require modification/s to minimize clogging problems and space requirement. In this study, a field-scale baffled and biorack hybrid constructed wetland (BBHCW) was developed as a part of 42 KLD decentralized wastewater treatment (DWT) system at Walchand College of Engineering, Sangli (M.S.), India for domestic wastewater. Brickbats were used as support medium in the baffled portion and corrugated sheets in biorack. Mixed vegetation of Typha angustifolia and Canna indica was used in both baffled and biorack portions. BBHCW was operated under the dynamic conditions of flow (0.60–9.89 m³/m² day) and strength (0.12–2.12 kg COD/m² day) for 8 months. The performance was assessed for the removal of organic carbon and nitrogen with and without recirculation of treated effluent. Tracer studies showed that the hydraulic efficiency was satisfactory. COD, BOD₃, and TKN removal is possible to an extent of 26.30 ± 1.36, 29.08 ± 2.43, and 19.39 ± 2.27%, respectively, under dynamic conditions. Recirculation enhances the removal efficiency of COD by 5.00–10.00%. However, TKN removal was not significant with or without recirculation. Morphological study showed that vegetation growth was well supported in BBHCW. The discarded corrugated sheets in BR and brickbats in BSFW are the most appropriate low-cost options. The clogging problem is reduced significantly. BBHCW is sturdy enough to absorb shock loading and space requirement can be reduced by judicious choice of HLR and OLR. BBHCW is an alternative to conventionally used sub-surface constructed wetland as a part of DWT.

• Novelty statement

• Development of newly configured baffled and biorack hybrid dual-species constructed wetland (BBHCW) for field scale application.

• Use of discarded brickbat and cement sheets as a new support medium and bioracks.

• Performance assessment of field-scale BBHCW for the removal of organic carbon (expressed as COD and BOD₃), and nitrogen (expressed as TKN) from domestic wastewater under highly dynamic conditions induced by fluctuating hydraulic loading rate (0.60–9.89 m³/m² day) and organic loading rate (0.12–2.12 kg COD/m² day).

摘要

常规使用的人工湿地需要修改以尽量减少堵塞问题和空间需求。在这项研究中，印度桑格利 (MS) Walchand 工程学院的 42 KLD 分散式污水处理 (DWT) 系统的一部分开发了现场规模的挡板和生物架混合人工湿地 (BBHCW)，用于处理生活污水。Brickbats 在挡板部分用作支撑介质，在 biorack 中用作波纹板。香蒲和美人蕉的混合植被用于挡板部分和生物架部分。BBHCW 在流量（0.60–9.89 m ³ /m ²天）和强度（0.12–2.12 kg COD/m ²天）8 个月。评估了在处理后的污水再循环和不循环的情况下去除有机碳和氮的性能。示踪剂研究表明水力效率令人满意。鳕鱼、生化需氧量₃和 TKN 在动态条件下的去除率分别为 26.30 ± 1.36、29.08 ± 2.43 和 19.39 ± 2.27%。再循环将 COD 的去除效率提高了 5.00-10.00%。然而，无论是否有再循环，TKN 的去除都不显着。形态学研究表明，BBHCW 中的植被生长得到了很好的支持。BR 中废弃的瓦楞板和 BSFW 中的砖块是最合适的低成本选择。堵塞问题显着减少。BBHCW 足够坚固，可以吸收冲击载荷，并且可以通过明智地选择 HLR 和 OLR 来减少空间需求。作为 DWT 的一部分，BBHCW 是传统使用的地下人工湿地的替代方案。

• 新颖性声明

• 开发新配置的挡板和生物架混合双物种人工湿地 (BBHCW)，用于田间规模应用。

• 使用废弃的砖块和水泥板作为新的支撑介质和生物架。

• 场规模BBHCW用于去除有机碳的性能评价（表示为COD和BOD ₃），并且通过波动水力负荷率（0.60-9.89米诱导高度动态的条件下生活废水氮（表示为TKN）³ /米²天）和有机负荷率（0.12–2.12 kg COD/m ²天）。