Department of Microbiology, Quaid-i-Azam University, 45320 Islamabad, Pakistan; Department of Industrial Biological Sciences, Ghent University Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium.
Department of Industrial Biological Sciences, Ghent University Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium.
J Environ Manage. 2018 Mar 15;210:349-358. doi: 10.1016/j.jenvman.2018.01.040.
Objective of the current work was to monitor the year-round response of full-scale hybrid constructed-wetlands (CWs) treating domestic wastewater under variable continuous flow. Two systems were evaluated: system-I consisted of an anaerobic baffled reactor (ABR) followed by a saturated vertical subsurface-flow (VSSF) CW and a free-water-surface (FWS) CW as a tertiary treatment; system-II consisted of an ABR followed by a horizontal subsurface-flow (HSSF) CW and FWS. Maximum reduction of 80 and 78%, 81 and 82%, 63 and 69%, 79 and 89% for chemical oxygen demand (COD), biological oxygen demand (BOD), total kjeldahl nitrogen (TKN) and total suspended solids (TSS) was achieved in Systems I and II respectively. There was also effective removal (94% and 93%) of the bacterial population in both systems while more than 94% of pathogenic microorganisms were removed. Data from both systems were further used to compute the first-order rate constants for the k-C* model commonly used in CW design. The treatment performance was confirmed to follow a first-order reaction rate, in which the k values of chemical oxygen demand (COD), biological oxygen demand (BOD), total kjeldahl nitrogen (TKN), total phosphorus (TP) and total suspended solids were calculated as 165, 117, 133, 7.5 and 78 m yr respectively for VSSF and 226, 134, 199, 22 and 73 m yr respectively for HSSF. A positive correlation with temperature was discovered for all parameters in both systems.
本研究旨在监测全年采用变连续流运行的规模化复合人工湿地（CWs）处理生活污水的情况。共评估了两个系统：系统 I 由厌氧折流板反应器（ABR）、饱和垂直潜流（VSSF）CW 和自由水表面（FWS）CW 组成，作为三级处理；系统 II 由 ABR、水平潜流（HSSF）CW 和 FWS 组成。系统 I 和系统 II 对化学需氧量（COD）、生物需氧量（BOD）、总凯氏氮（TKN）和总悬浮固体（TSS）的最大去除率分别为 80%和 78%、81%和 82%、63%和 69%、79%和 89%。两个系统的细菌种群去除率也达到了 94%和 93%，同时超过 94%的病原体被去除。两个系统的数据还用于计算 CW 设计中常用的 k-C*模型的一级速率常数。处理性能被证实遵循一级反应速率，其中 VSSF 的 COD、BOD、TKN、TP 和 TSS 的 k 值分别计算为 165、117、133、7.5 和 78 m yr，HSSF 的 k 值分别为 226、134、199、22 和 73 m yr。两个系统的所有参数均与温度呈正相关。
