Evaluation of the effectiveness of dephosphotation of wastewater from district wastewater treatment plants using aluminum polyoxychloride

Authors

  • Надежда Васильевна Шурмина Research Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences
  • Дамир Ильдарович Хабибуллин NPC «Biotechengineering»
  • Andrey M. Petrov Research Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences
  • Igor V. Knyazev Research Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences

DOI:

https://doi.org/10.24852/2411-7374.2022.2.68.73

Keywords:

wastewater, phosphates, aluminum polyoxychloride, dephosphotation

Abstract

During the survey of the existing district treatment facilities, the average characteristics of wastewater were determined at successive stages of treatment. The advantages and disadvantages of introducing coagulants for the purpose of dephosphotation of wastewater at different points of the technological scheme are considered. According to the results of the examination, the point of application of the coagulant was determined, which ensures the maximum effect of dephosphotation when using the minimum effective dose of the coagulant. The effect of different doses of aluminum polyoxychloride was studied in laboratory conditions (3.5, 7, 14, 21, 28 mg/dm3 in terms of Al2O3) on the residual content and efficiency of phosphate binding in wastewater after secondary settling tanks. The efficiency of interaction and the efficiency of phosphate removal from wastewater depending on the dose of coagulant were determined. The role of filtration through zeolite in the removal of phosphates from wastewater treated with different doses of aluminum polyoxychloride has been determined. The optimal effective concentration of the coagulant was 7 mg/dm3 (according to Al2O3) with a phosphate binding efficiency of 1.07 mgPO4/mgAl2O3. The experimental and industrial tests carried out confirmed the objectivity of the results obtained in the laboratory. With continuous management of the dephosphotation process and a coagulant dose of 7 mg/dm3 (according to Al2O3), the phosphate binding efficiency was 1.19 mgPO4/mgAl2O3, the residual phosphorus content of phosphates in wastewater after tertiary sedimentation tanks was at the level of 0.14 mg/dm3, the aluminum content did not exceed 1.1 MPC for fisheries reservoirs.

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Published

2022-07-06

How to Cite

Шурмина, Н. В., Хабибуллин, Д. И., Petrov, A. M. ., & Knyazev, I. V. (2022). Evaluation of the effectiveness of dephosphotation of wastewater from district wastewater treatment plants using aluminum polyoxychloride. Russian Journal of Applied Ecology, (2), 68–73. https://doi.org/10.24852/2411-7374.2022.2.68.73

Issue

No. 2 (2022)

Section

Ecological safety

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