Adsorption and precipitation behaviors of zinc, copper and tetracycline with struvite products obtained by phosphorus recovery from swine wastewater. Issue 6 (December 2020)

• Record Type: Journal Article
• Authors: Wang, Yuan; Wang, Xuejiang; Li, Jing; Li, Yuan; Liu, Yiyang; Wang, Fei; Zhao, Jianfu
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 6(2020)
• Publication Date: 2020-12
• Subjects: Tetracycline -- Zinc -- Copper -- Struvite -- Adsorption -- Precipitation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.104488
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Struvite-loaded zeolite (SZ) was obtained by nutrient recovery from swine wastewater. Heavy metals and TC were stored by SZ via precipitation and adsorption, respectively. Cu(II) had more positive effects on TC adsorption than Zn(II) via complexation. The competitive heavy metal ion and TC inhibited heavy metal precipitation on SZ. Soluble organic matter lowered pollutant storage via complexation and competition. Abstract: Few investigations take the combined pollution of heavy metals and antibiotics into consideration during the recovery of phosphorus through struvite crystallization. In this study, the adsorption and precipitation behaviors of Zn(II), Cu(II) and tetracycline (TC) with struvite-loaded zeolite (SZ) were investigated by batch experiments. SZ was obtained through reclaiming phosphate from swine wastewater to MgO-loaded zeolite. Experimental results proved that heavy metals and TC were stored by SZ primarily through precipitation and physical adsorption, respectively, with partition coefficients of 191.9 L/kg for Cu(II), 112.5 L/kg for Zn(II) and 1333 L/kg for TC in ternary-pollutant systems. With the presence of Cu(II), the adsorption capacities of SZ for TC increased by around five times, whilst Zn(II) inhibit TC adsorption onto SZ. Cu(II) precipitation was hindered by TC and Zn(II) resulting in less Cu5 (PO4 )2 (OH)4 formation on SZ. The effects of TC on Zn(II) precipitation by SZ were reversed with the variation of Zn(II) or Cu(II) concentration in solution due to two antagonistic effects—restriction of surface-induced precipitation and alleviation of competition interactions. In addition, high concentrations of dissolved organic matter (DOM) decreased the storage of Zn(II), Cu(II) and TC by SZ through competition effects. This study demonstrated that heavy metals and antibiotics in wastewaters could be simultaneously adsorbed and precipitated by struvite products, which was greatly affected by the complexing species and competing ions of the pollutants in wastewater.