Influential factors on activated sludge deterioration in anoxic-oxic (A/O) biological treatment of coking wastewater

• Autorzy: Chun-Hui Z. , Hai-dong H. , Jun C. , Wen-wen Z. , Yuan-jie G. , Ke N.
• Języki publikacji: EN

Abstrakty

EN

The control measures for deterioration of aerobic activated sludge were experimented. Wastewater samples with different pH, temperature, SVI, and MLSS were investigated to detect the cause of sludge deterioration. The results show that after being operated at high S₂O₃²⁻ (which could lead to a pH decrease) loading in an A/O biological reactor treated for coking wastewater, though the pH was controlled at about 7.0 by the addition of NaOH, the COD removal efficiency was decreased deeply. The MLSS decreased from 3,800-4,300 mg/L to 2,020 mg/L after loading of S₂O₃²⁻ and NaOH in the oxic unit of A/O biological reactor for 12 days. The COD removal efficiencies and MLSS concentrations were decreased sharply when the wastewater’s temperature was over 30ºC, which indicates the bulking of activated sludge in the oxic unit of A/O biological reactor. The results suggest that it cannot inhibit the occurrence of sludge deterioration only by controlling the pH in the oxic unit of an A/O biological reactor. Although the addition of NaOH could inhibit sludge bulking, the decreased MLSS concentration would significantly reduce the COD removal efficiency. The decline of COD removal efficiency may be due to the high temperature leading to sludge death.

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2013
• Tom: 22
• Numer: 6
• Opis fizyczny: p.1877-1880,fig.,ref.

Twórcy

autor

Chun-Hui Z.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

autor

Hai-dong H.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

autor

Jun C.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

autor

Wen-wen Z.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

autor

Yuan-jie G.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

autor

Ke N.

• School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China

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