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Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment.

Abstract

Two groups of integrated vertical-flow constructed wetland (IVCW) microcosms were established for treating two types of representative wastewater: domestic and nitrified wastewater under two loading rates (LRs) over about two years. Their removal capacities of organic substance and nitrogen as well as the effects of loading rate (LR), outflow temperature and dissolved oxygen (DO) concentration were investigated and compared. Efficient chemical oxygen demand (COD) eliminations were achieved by the IVCWs, with the mass removal rates increasing linearly with the increasing LRs strongly, achieving average value of 56.07 g m(-2) d(-1) at the highest loading rate. Nevertheless, the effluent COD concentrations also increased, with the average value exceeding Class I A discharge standard (< 50 mg L(-1)) for municipal wastewater treatment plants in China at the highest loading rate. Greater total nitrogen (TN) mass removal rates but lower efficiencies were obtained at the high LR for both types of wastewater, and better removal was achieved for nitrified wastewater (NW) in comparison to domestic wastewater (DW), probably due to the prevailing anoxic conditions inside the IVCW beds restricted nitrification process of DW. The influences of LR, temperature and DO on COD removal were slight, but all remarkable on TN reduction. As compared to DO, temperature was more crucial for nitrogen removal, and the temperature dependence coefficient for TN removal of low LR of NW was significantly greater than others.

Authors+Show Affiliations

a Research Institute of Engineering and Technology, Yunnan University , Kunming , China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25901854

Citation

Chang, Jun J., et al. "Comparative Evaluations of Organic Matters and Nitrogen Removal Capacities of Integrated Vertical-flow Constructed Wetlands: Domestic and Nitrified Wastewater Treatment." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 50, no. 7, 2015, pp. 757-66.
Chang JJ, Liang K, Wu SQ, et al. Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2015;50(7):757-66.
Chang, J. J., Liang, K., Wu, S. Q., Zhang, S. H., & Liang, W. (2015). Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 50(7), 757-66. https://doi.org/10.1080/10934529.2015.1012009
Chang JJ, et al. Comparative Evaluations of Organic Matters and Nitrogen Removal Capacities of Integrated Vertical-flow Constructed Wetlands: Domestic and Nitrified Wastewater Treatment. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2015;50(7):757-66. PubMed PMID: 25901854.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment. AU - Chang,Jun J, AU - Liang,Kang, AU - Wu,Su Q, AU - Zhang,Sheng H, AU - Liang,Wei, PY - 2015/4/23/entrez PY - 2015/4/23/pubmed PY - 2015/12/15/medline KW - COD removal KW - dissolved oxygen KW - domestic wastewater KW - integrated vertical-flow constructed wetlands KW - loading rate KW - nitrified wastewater KW - nitrogen removal KW - temperature SP - 757 EP - 66 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 50 IS - 7 N2 - Two groups of integrated vertical-flow constructed wetland (IVCW) microcosms were established for treating two types of representative wastewater: domestic and nitrified wastewater under two loading rates (LRs) over about two years. Their removal capacities of organic substance and nitrogen as well as the effects of loading rate (LR), outflow temperature and dissolved oxygen (DO) concentration were investigated and compared. Efficient chemical oxygen demand (COD) eliminations were achieved by the IVCWs, with the mass removal rates increasing linearly with the increasing LRs strongly, achieving average value of 56.07 g m(-2) d(-1) at the highest loading rate. Nevertheless, the effluent COD concentrations also increased, with the average value exceeding Class I A discharge standard (< 50 mg L(-1)) for municipal wastewater treatment plants in China at the highest loading rate. Greater total nitrogen (TN) mass removal rates but lower efficiencies were obtained at the high LR for both types of wastewater, and better removal was achieved for nitrified wastewater (NW) in comparison to domestic wastewater (DW), probably due to the prevailing anoxic conditions inside the IVCW beds restricted nitrification process of DW. The influences of LR, temperature and DO on COD removal were slight, but all remarkable on TN reduction. As compared to DO, temperature was more crucial for nitrogen removal, and the temperature dependence coefficient for TN removal of low LR of NW was significantly greater than others. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/25901854/Comparative_evaluations_of_organic_matters_and_nitrogen_removal_capacities_of_integrated_vertical_flow_constructed_wetlands:_Domestic_and_nitrified_wastewater_treatment_ L2 - https://www.tandfonline.com/doi/full/10.1080/10934529.2015.1012009 DB - PRIME DP - Unbound Medicine ER -