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温度与污泥浓度对剩余污泥水解及脱水性能的影响

Keywords: 剩余污泥,水解,脱水性能,污泥浓度,总悬浮固体(TSS)

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Abstract:

污泥碱性水解产生短链脂肪酸,可应用到污水脱氮除磷中,但会使其脱水性能恶化.为考察温度和污泥浓度对剩余污泥水解及脱水性能的影响,试验研究了20d内剩余污泥在pH=10、温度25和35℃、不同总悬浮固体(totalsuspendedsolids,TSS)下厌氧水解和脱水性能的变化,对溶解性化学需氧量(solublechemicaloxygendemand,SCOD)和毛细管吸收时间(capillarysuctiontime,CST)进行了分析.试验表明:25℃时污泥脱水性随ρ(TSS)升高先恶化后变化不大,各发酵时间SCOD均升高后变缓;35℃时污泥脱水性随ρ(TSS)升高先恶化后略提高,SCOD变化与25℃时一致.SCOD变化情况与CST显著正相关;较高温度SCOD溶出更多,脱水性能稍有恶化;TSS对污泥脱水性能的影响较温度更显著.

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