Organics and nutrient removal from swine wastewater by constructed wetlands using ceramsite and magnetite as substrates. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Dong, Lu; Qi, Zhiping; Li, Mengqi; Zhang, Yan; Chen, Yingrun; Qi, Yuanfeng; Wu, Haiming
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Constructed wetland -- Substrate -- Swine wastewater -- Organic removal -- Nutrient removal; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.104739
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Magnetite and ceramsite materials were used in CWs for treating swine wastewater. The magnetite-based CW was more effective in removing organic matter. The ceramsite-based CW was more efficient for the TN and TP removal. Characteristics of DOM in swine wastewater affected nitrogen removal in CWs. Abstract: The discharge of swine wastewater has posted a serious threat to water bodies in rural areas and been receiving increasing attention worldwide. This study investigated the treatment performances of synthetic wastewater and real swine wastewater in subsurface flow constructed wetland (SSFCW) with different substrates (gravel, ceramsite and magnetite). The results showed that all systems exhibited better removal performances and higher nitrous oxide (N2 O) emissions for synthetic wastewater than real swine wastewater. Magnetite-based CW was efficient for organic matter removal with chemical oxygen demand (COD) removal for 53.0–91.5 %. Ceramsite-based CW was effective in removing nutrients with 11.0–63.2 % for total nitrogen (TN) removal and 93.2–95.5 % for total phosphorus (TP) removal. Five dissolved organic matters (DOM) (UVA humic-like, UVC humic-like, tyrosine-like and tryptophan-like substances) were identified in swine wastewater before and after the treatment of CWs. The relative proportion of humic substance in all CWs fluctuated slightly which might result in the decrease of organics removal and the restriction of heterotrophic denitrification in CWs with swine wastewater. While the tyrosine-like and the tryptophan-like showed an opposite variation.