Application of constructed wetland for urban lake water purification: Trial of Xing-qing Lake in Xi’an city, China

Cui, Fang; Zhou, Qingwei; Wang, Y.; Zhao, Yaqian

doi:10.1080/10934529.2011.571994

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…According to a study conducted at Xing-Qing Lake in Xi'an, China, the constructed wetland can reduce pollutant concentrations by 84.2% for COD, 53.8% for NH3-N, 47.9% for total nitrogen, 73.3% for total phosphor, and 86.6% for SS [5]. Another study in KKRBCW (Kaoping River Rail Bridge Constructed Wetland), Taiwan, found that wetland reduces pollution concentrations by 97% for TC, 55% for BOD, and more than 30% for nutrient.…”

Section: Literature Studymentioning

confidence: 99%

Numerical Modelling of Constructed Wetland using Software HYDRUS 2D

Rizaldi

Limantara

Suhartanto

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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One of the problems involving water bodies is the pollution of water sources, which later becomes the parent of various social, economic, and health problems. One of these conditions can be overcome by utilizing phytoremediation through constructed wetlands. HYDRUS is a software that offers easy modelling of pollutant decay mechanisms in water bodies and constructed wetlands using finite element method. This study aims to show and analyse how HYDRUS software can model the mechanism in constructed wetland by using finite element method. The parameters observed are the time for the pollutant, namely ammonia, nitrate, and inorganic phosphorous, to reach the outlet, and the response curve of the pollutant loading on the model. From the simulation, it can be inferred that the maximum velocity of the water going through the constructed wetland is 8.11 m/day, or 811 cm/day. The dominating velocity in the wetland is around 160 cm/day, or 1.6 m/day. The response curve of the pollutant transport is also in accordance with theoretical response for impulse loading. The result yields the effectivity of simulated constructed wetland, which are 90.33% for ammonia and nitrate, and 90.26% for inorganic phosphorous. The result yields quite optimistic effectivity of the constructed wetland, which may be caused by the assumptions made in the model, which goes through simplification method. It can also be caused by the differences in plants assumption. In the HYDRUS simulation, the plant used is grass, which does not specify what kind of grass. Meanwhile, the physical simulation uses water bamboo.

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Section: Literature Studymentioning

confidence: 99%

Numerical Modelling of Constructed Wetland using Software HYDRUS 2D

Rizaldi

Limantara

Suhartanto

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…However, the use of hybrid constructed wetlands (HCWs) has largely been focused on treating domestic and municipal wastewater, although various industrial wastewater treatments have been successfully achieved worldwide (Ávila et al 2013;Vymazal 2013;Comino et al 2011). In fact, relatively little has been reported on the use HCWs for on-site river water improvement especially in large scale (Cui et al 2011). Experience is lacking in adopting optimal system configurations, operation parameters, and seasonal changes of performance, in particular for the polluted urban rivers in the loess plateau of China, a semi-arid region.…”

Section: Introductionmentioning

confidence: 99%

Performance of a pilot demonstration-scale hybrid constructed wetland system for on-site treatment of polluted urban river water in Northwestern China

Zheng

Wang

Dzakpasu

et al. 2015

Environ Sci Pollut Res

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Hybrid constructed wetland (HCW) systems have been used to treat various wastewaters across the world. However, large-scale applications of HCWs are scarce, particularly for on-site improvement of the water quality of highly polluted urban rivers in semi-arid regions. In this study, a large pilot-scale HCW system was constructed to improve the water quality of the Zaohe River in Xi'an, China. With a total area of about 8000 m(2), the pilot HCW system, composed of different configurations of surface and subsurface flow wetlands, was operated for 2 years at an average inflow volume rate of 362 m(3)/day. Local Phragmites australis and Typha orientalis from the riverbank were planted in the HCW system. Findings indicate a higher treatment efficiency for organics and suspended solids than nutrients. The inflow concentrations of 5-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), suspended solids (SS), total nitrogen (TN), NH3-N, and total phosphorus (TP) were 125.6, 350.9, 334.2, 38.5, 27.2, and 3.9 mg/L, respectively. Average removal efficiencies of 94.4, 74.5, 92.0, 56.3, 57.5, and 69.2%, respectively, were recorded. However, the pollutant removal rates were highly seasonal especially for nitrogen. Higher removals were recorded for all pollutants in the autumn while significantly lower removals were recorded in the winter. Plant uptake and assimilation accounted for circa 19-29 and 16-23% of the TN and TP removal, respectively. Moreover, P. australis demonstrated a higher nutrient uptake ability and competitive potential. Overall, the high efficiency of the pilot HCW for improving the water quality of such a highly polluted urban river provided practical evidence of the applicability of the HCW technology for protecting urban water environments.

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“…Reduction or removal of nutrients loadings from the inflows is one of the most commonly used lake restoration techniques. It can be achieved by best management practices such as wetland filtration [14,15] or direct control and treatment of the point source discharges [16]. Since it is observed that algae in Kranji Reservoir is phosphorus-limited, we decreased the phosphorus loadings in inflows by 50%.…”

Section: Management Scenarios Evaluationmentioning

confidence: 99%