Degradation of ship grey water by combination of pre-ozonation and enhanced biofilm

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Abstract In order to degrade the ship grey water efficiently and economically, the pre-ozonation and moving bed biofilm reactor was combined to degrade it in depth. The effects of temperature, pH and ozone dose on the ozonation of ship grey water were investigated with sufficient silicon aluminum supported catalyst and in absence of it, respectively. Effects of different temperature, pH and hydraulic retention time on degradation of pre-ozonated effluent were subsequently studied in moving bed biofilm reactor. The results showed that the removal rate of COD, NH⁺₄-N and oil for the simulated ship grey water reached 68.09%, 35.53% and 70.93%, respectively with sufficient silicon aluminum supported catalyst in stage of pre-ozonation, and in this process, the temperature of 30 ℃, pH of 9.5, ozone penetration time of 9 minutes were employed while the volume of grey water was 3 L, the oxygen flow rate in oxygen generator was 1 L·min^-1 and concentration of oxygen was 94%. In the stage of moving bed biofilm reactor degradation, the removal rate of COD, ammonia nitrogen and oil reached 84.8%, 76.1% and 82.1%, respectively in condition of hydraulic retention time of 9 h, temperature of 30 ℃ and pH of 9. Consequently, ozonation combined moving bed biofilm had observably effects on simulated ship grey water degradation, which provides a reference for true treatment of ship grey water.

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	LIAO Hongguo
	CUI Zhengwei
	YANG Jiandong

Keywords： ship grey water ozone oxidation moving bed biofilm reactor

Received 2022-10-20;

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LIAO Hongguo, CUI Zhengwei, YANG Jiandong.Degradation of ship grey water by combination of pre-ozonation and enhanced biofilm[J] Chemcial Industry and Engineering, 2024,V41(3): 191-198

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