Can cold-season macrophytes at the senescence stage improve nitrogen removal in integrated constructed wetland systems treating low carbon/nitrogen effluent?. (October 2018)

• Record Type: Journal Article
• Authors: Zhao, Dehua; Zhang, Miao; Liu, Zhe; Sheng, Jing; An, Shuqing
• Is Part Of: Bioresource technology. Volume 265(2018)
• Page Start: 380
• Page End: 386
• Publication Date: 2018-10
• Subjects: Nitrogen removal -- Constructed wetland -- Carbon source -- Cold-season macrophyte -- Decomposition; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.06.020
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The macrophyte configuration improves the N removal in the final effluent of SP-BCW. High COD water in the SP should be pumped to the BCW in early decomposition stages. Cold-season macrophytes are recommended in CWs for secondary effluents from WWTPs. Abstract: Cold-season macrophytes were configured in a system of stabilization ponds (SPs) and batch operation constructed wetlands (BCWs) to supply a carbon source for low carbon/nitrogen (C/N) effluent in spring and summer without generating secondary pollution during the decomposition process. For eutrophic water, the macrophyte configuration increased the average removal efficiency (RE) from 41.6% to 68.6% and from 70.2% to 83.7% for NO3 − -N and TN in the final BCW effluent, respectively, with the concentrations decreasing from 3.08 mg/L to 1.04 mg/L and from 4.94 mg/L to 3.12 mg/L, respectively. In the early decomposition stages, the RE and concentrations were 82.9% and 0.53 mg/L and 89.4% and 2.38 mg/L for NO3 − -N and TN, respectively. Thus, cold-season macrophytes can improve N removal in SP-BCW systems at the senescence stage, especially at the early decomposition stage.