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Analysis of Reject Water Formed in the Mechanical Dewatering Process of Digested Sludge Conditioned by Physical and Chemical Methods

Author

Listed:
  • Beata Bień

    (Faculty of Infrastructure and Environment, Czestochowa University of Technology, 42-200 Czestochowa, Poland)

  • Jurand D. Bień

    (Faculty of Infrastructure and Environment, Czestochowa University of Technology, 42-200 Czestochowa, Poland)

Abstract

Reject water separated from digested sludge may be a potential source of nutrients due to its high content. However, most often, reject water after sludge dewatering is directed to sewage lines at wastewater treatment plants, negatively affecting their operation, especially in the biological part. The activities related to sludge conditioning before dewatering have a direct impact on the quality of the reject water. The reject water of raw digested sludge is characterized by very high concentrations of ammonium nitrogen, at 1718 mgN-NH 4 + /dm 3 ; phosphates, at 122.4 mgPO 4 3− /dm 3 ; and chemical oxygen demand (COD), at 2240 mgO 2 /dm 3 . The objective of the research was to determine the impact of selected sludge conditioning methods on the quality of reject water obtained after sludge dewatering. The following parameters were analyzed in the reject water: the chemical oxygen demand (COD), phosphates, ammonium nitrogen, and total suspended solids (TSS). It has been observed that the sludge sonification process increases the content of impurities (COD, phosphates) in reject water with an increase in the amplitude of the ultrasonic field. On the other hand, the chemical reagents cause a decrease in the concentration of the pollutants with an increase of the chemical dose. It has been found that the inorganic coagulant PIX 113 gives much better results regarding the reduction of contamination than the polyelectrolyte Zetag 8180.

Suggested Citation

  • Beata Bień & Jurand D. Bień, 2022. "Analysis of Reject Water Formed in the Mechanical Dewatering Process of Digested Sludge Conditioned by Physical and Chemical Methods," Energies, MDPI, vol. 15(5), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1678-:d:757158
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    References listed on IDEAS

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    1. Iwona Zawieja & Małgorzata Worwąg, 2021. "Biogas Production from Excess Sludge Oxidized with Peracetic Acid (PAA)," Energies, MDPI, vol. 14(12), pages 1-17, June.
    2. Lidia Wolny & Paweł Wolski, 2021. "Ultrasounds Energy as an Agent of Polyelectrolyte Modification Prior to Sewage Sludge Conditioning," Energies, MDPI, vol. 14(19), pages 1-11, September.
    3. Beata Bień & Jurand D. Bień, 2021. "Conditioning of Sewage Sludge with Physical, Chemical and Dual Methods to Improve Sewage Sludge Dewatering," Energies, MDPI, vol. 14(16), pages 1-14, August.
    4. Tomasz Kamizela & Mariusz Kowalczyk, 2021. "Impact of Conditioning Substances and Filtration Pressure on Dewatering Efficiency of Sewage Sludge," Energies, MDPI, vol. 14(2), pages 1-10, January.
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    Cited by:

    1. Eliza Kulbat & Krzysztof Czerwionka, 2023. "Influence of Phosphorus Speciation on Its Chemical Removal from Reject Water from Dewatering of Municipal Sewage Sludge," Energies, MDPI, vol. 16(3), pages 1-12, January.
    2. Jiahua Xia & Juan Ji & Zhiqiang Hu & Ting Rao & Ankang Liu & Jingqian Ma & Yongjun Sun, 2022. "Application of Advanced Oxidation Technology in Sludge Conditioning and Dewatering: A Critical Review," IJERPH, MDPI, vol. 19(15), pages 1-14, July.

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