Treatment of wastewater containing NH4+-N and Cu2+ in copper mining area

JING Qingxiu; PENG Jian; ZHANG Chengxi; HUANG Xiaodong; YOU Wei

doi:10.13264/j.cnki.ysjskx.2021.02.010

Volume 12 Issue 2

Apr. 2021

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Nonferrous Metals Science and Engineering > 2021 > 12(2): 72-78. > DOI: 10.13264/j.cnki.ysjskx.2021.02.010

JING Qingxiu, PENG Jian, ZHANG Chengxi, HUANG Xiaodong, YOU Wei. Treatment of wastewater containing NH₄⁺-N and Cu²⁺ in copper mining area[J]. Nonferrous Metals Science and Engineering, 2021, 12(2): 72-78. DOI: 10.13264/j.cnki.ysjskx.2021.02.010

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Treatment of wastewater containing NH₄⁺-N and Cu²⁺ in copper mining area

Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

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Received Date: December 09, 2020
Published Date: April 29, 2021

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In view of the characteristics of wastewater sewage containing low-concentration NH₄⁺-N and Cu²⁺ in copper mining areas, amethod combined adsorption with biological aerated filter (BAF) processes was applied to for this kind of sewage treatment. The adsorption and removal of Cu²⁺ in simulated sewage by modified copper slag-based ceramsite were explored. And the removal efficiency of BAF filled with the ceramsites on NH₄⁺-N in simulated wastewater after copper removed by adsorption process was investigated under different operating conditions. The results showed that under the optimum conditions of the initial concentration of Cu²⁺ in sewage being 50 mg/L, the initial pH value about 5.00, the ceramsite addition of 20 g/L, the temperature of 35 ℃, and the adsorption time 120 min, the modified ceramsite had a good adsorption effect on Cu²⁺with the equilibrium adsorption capacity reaching about 0.936 mg/g.Under the conditions of the initial concentrations of Cu²⁺and NH₄⁺-N in simulated wastewater 20 and 100 mg/L, respectively, adding content of ceramsite 40 g/L, temperature 35 ℃, the removal rate of Cu²⁺adsorbed by the modified ceramsite reached 80% with the rest Cu²⁺ concentration being only 4.0 mg/L, while the removal effect of the ceramsite on NH₄⁺-N was not obvious. When the simulated wastewater was treated by BAF after Cu²⁺ in it was removed by the modified ceramsite, under the optimum conditions of hydraulic residence time HRT=6 h, carbon-nitrogen ratio m(C/N)=4/1, pH=8.00 and aeration rate of 1.2 L/min, the removal rate of NH₄⁺-N reached 96%. The combined process of adsorption and biological aerated filter (BAF) technique could effectively treat the wastewater containing low concentration of NH₄⁺-N and Cu²⁺ in copper mine area, and the rest concentrations of Cu²⁺ and NH₄⁺-N in the wastewater both met the requirements of national emission standards.
- ammonia nitrogen,
- copper ions,
- copper smelting slag,
- adsorption method,
- biological aerated filter (BAF)

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Treatment of wastewater containing NH₄⁺-N and Cu²⁺ in copper mining area