Magnetic biochar composite decorated with amino-containing biopolymer for phosphorus recovery from swine wastewater

Abstract Struvite (MgNH4PO4·6H2O) crystallisation is a promising approach for phosphorus recovery from swine wastewater. Currently, intensive pig feeding has made heavy metals (HMs) extensive in swine wastewater; therefore, significant amounts of HMs have been detected in struvite recovery products. In this study, the HM residues in the struvite products recovered from stirred and fluidised bed reactors were investigated. The results showed that Zn, Mn, and Cu were the most abundant elements in swine wastewater (1,175.3 ± 178.0, 745.4 ± 51.5, and 209.3 ± 54.4 μg L−1, respectively). The HMs, especially Zn (97.0%) and Cu (96.8%), were mainly distributed in the total suspended solids (TSS) of the swine wastewater. Redundancy analysis revealed that the HMs in the struvite products harvested from the fluidised bed reactor were mainly attributable to the aggregation of dissolved matters, because most TSS were elutriated through fluidisation. In contrast, the HMs in the struvite products harvested from the stirred reactor mainly originated from the TSS, which complexed with the HMs, and co-precipitated and settled with the struvite products. Furthermore, chemical fractionation of the HM species confirmed that the presence of HMs in the struvite products was mainly attributable to metal precipitation and organic aggregation.

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Adsorption behavior of tetracyclines by struvite particles in the process of phosphorus recovery from synthetic swine wastewater

Chemical Engineering Journal ◽

10.1016/j.cej.2016.11.062 ◽

2017 ◽

Vol 313 ◽

pp. 1633-1638 ◽

Cited By ~ 37

Author(s):

Zhi-Long Ye ◽

Yujun Deng ◽

Yaoyin Lou ◽

Xin Ye ◽

Jianqiao Zhang ◽

...

Keyword(s):

Phosphorus Recovery ◽

Adsorption Behavior ◽

Swine Wastewater

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Effects of three kinds of organic acids on phosphorus recovery by magnesium ammonium phosphate (MAP) crystallization from synthetic swine wastewater

Chemosphere ◽

10.1016/j.chemosphere.2013.11.019 ◽

2014 ◽

Vol 101 ◽

pp. 41-48 ◽

Cited By ~ 53

Author(s):

Yonghui Song ◽

Yunrong Dai ◽

Qiong Hu ◽

Xiaohua Yu ◽

Feng Qian

Keyword(s):

Organic Acids ◽

Ammonium Phosphate ◽

Phosphorus Recovery ◽

Swine Wastewater ◽

Magnesium Ammonium Phosphate ◽

Magnesium Ammonium

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Adsorption and precipitation behaviors of zinc, copper and tetracycline with struvite products obtained by phosphorus recovery from swine wastewater

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2020.104488 ◽

2020 ◽

Vol 8 (6) ◽

pp. 104488

Author(s):

Yuan Wang ◽

Xuejiang Wang ◽

Jing Li ◽

Yuan Li ◽

Yiyang Liu ◽

...

Keyword(s):

Phosphorus Recovery ◽

Swine Wastewater

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Development of phosphorus recovery reactor for enlargement of struvite crystals using seawater as the magnesium source

Water Science & Technology ◽

10.2166/wst.2019.133 ◽

2019 ◽

Vol 79 (7) ◽

pp. 1376-1386 ◽

Cited By ~ 1

Author(s):

Pidchaya Wongphudphad ◽

Patiya Kemacheevakul

Keyword(s):

Room Temperature ◽

Phosphorus Recovery ◽

Swine Wastewater ◽

Continuous Reactor ◽

Recovery Efficiency ◽

Ph Values ◽

P Recovery ◽

Struvite Crystallization ◽

Optimized Conditions ◽

Magnesium Source

Abstract Struvite crystallization is an interesting method for the recovery of phosphorus (P) from wastewater. However, the struvite crystals obtained are small, which makes them difficult to separate from wastewater. A continuous reactor for enlarging struvite crystals was developed. Batch-scale experiments were conducted to investigate the optimum factors for the enlargement of struvite crystals. The results of pH experiments showed that P recovery efficiency increased with an increase of pH values (7.6 to 10), while the size of struvite crystals decreased. The results of the Mg:P ratios found that the maximum P recovery efficiency occurred at the maximum ratio of Mg:P. The sizes of struvite crystals were not significantly different. For the variation of temperature values, the results showed that P recovery efficiency and crystal sizes decreased when temperature values increased. Therefore, the optimized conditions for P recovery efficiency and enlargement of struvite crystals for the continuous reactor were pH 8.5 and an Mg:P ratio of 1.2:1 at 30 °C (room temperature). The treated swine wastewater and seawater were continuously fed in at the bottom of the reactor. After 30 days, the size of struvite crystals had increased from 125 μm to 0.83 mm (seven times).

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