A Case Study of Swine Wastewater Treatment via Electrochemical Oxidation by Ti 4 O 7 Anode

Hongyou Wan, Ruifeng Wang, Beibei Wang, Kehao Zhang, Huanhuan Shi () and Hailong Wang
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Hongyou Wan: School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Ruifeng Wang: School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Beibei Wang: College of Resources and Environmental Science, Henan Agricultural University, Zhengzhou 450002, China
Kehao Zhang: College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
Huanhuan Shi: School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Hailong Wang: College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

IJERPH, 2022, vol. 19, issue 21, 1-11

Abstract: With the rapid development of breeding industry, the efficient treatment of dramatically increasing swine wastewater is gradually becoming urgent. In particular, the development of application technologies suitable for the relatively small piggeries is critical due to the time cost and space requirements of conventional biological methods. In this study, Electrochemical oxidation (EO) was selected to systematically explore the treatment performance of three different swine wastewaters by Ti 4 O 7 anode. It was observed that the colors changed from dark brown to light yellow after 60 min treatment at 50 mA/cm 2 , and the removal rates of turbidity and suspended solids ranged from 89.36% to 93.65% and 81.31% to 92.55%, respectively. The chemical oxygen demand (COD), ammonia nitrogen (NH 3 -N) and total phosphorus (TP) of all the three swine wastewaters were simultaneously removed to a very low concentration in 120 min, especially for sample III, 61 ± 9 mg/L of COD, 6.6 ± 0.4 mg/L of NH 3 -N and 5.7 ± 1.1 mg/L of TP, which met the Discharge Standard of Pollutants for Livestock and Poultry Breeding (GB 18596-2001). Moreover, 70.93%–85.37% mineralization rates were also achieved in 120 min, confirming that EO treatment by Ti 4 O 7 could efficiently remove the organic matters in wastewater. Excitation–emission matrix (EEM) and UV-vis spectrum characterization results further proved that aromatic compounds and macromolecules in wastewater were rapidly removed, which played important roles in the mineralization processes. The findings here provided an efficient and environment-friendly technology for swine wastewater treatment.

Keywords: swine wastewater; electrochemical oxidation; Ti 4 O 7; efficient removal (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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