SBR不同进水中反硝化除磷颗粒污泥的培养

Cultivation of denitrifying phosphorus removal granular sludge in sequencing batch reactor for treating different kinds of wastewater

分别以人工配水、加Ca^(2+)人工配水和实际生活污水为进水水源,在A/O/A运行模式的3套SBR反应器(R1、R2和R3)中培养反硝化除磷颗粒污泥,研究了其生化特性和启动过程的除污性能,分析了反硝化除磷能力,最后对颗粒化机理进行了探讨,重点考察了反硝化除磷颗粒污泥启动过程中对COD、NH_4^+-N、TN和TP的去除情况.结果表明,R1~R3均在30 d内成功得到反硝化除磷颗粒污泥,颗粒污泥平均粒径大于600μm,比重和比耗氧速率较大,含水率较低;培养过程中出水COD平均值低于40 mg·L^(-1),出水TN、NH+4-N及TP平均浓度低于1 mg·L^(-1);系统稳定后一个典型周期内试验表明,COD、NH_4^+-N、TN和TP的去除效果良好,对COD、NH+4-N、TN及TP的去除率可达90%以上;R1~R3中最大比释磷速率分别达14.34、8.32和2.32 mg·g·h^(-1)(以每g MLVSS每小时释放的P量(mg)计),R1~R2中最大比吸磷速率分别达14.13和2.34mg·g·h^(-1)(以每g MLVSS每小时吸收的P量(mg)计);试验结果表明,Ca^(2+)对颗粒化有促进作用.

Cultivation of denitrifying phosphorus removal granular sludge was carried out in three sequencing batch reactors（SBR, corresponding to R1,R2 and R3） fed with synthetic wastewater, synthetic wastewater with 10 mg·L-1Ca2＋）nd domestic wastewater, respectively, under an A/ O/ A operationmode to investigate the biochemical and physical characteristics of granular sludge, nutrients removal performance during start-up period and mechanism ofaerobic granulation. Results show that granules with a diameter over 600 μm was obtained in R1 ~ R3 within 30 days, with the characteristics of low inmoisture content, high in specific gravity and specific oxygen uptake rate. Nutrients removal performance reveals that effluent COD concentration wasalways lower than 40 mg·L^（-1）, and effluent nitrogen（total nitrogen and ammonia nitrogen include） and phosphorus（total phosphorus） were always lowerthan 1 mg·L^（-1）. The performance illustrates that removal rates of COD, nitrogen and phosphorus steadily remained higher than 90%. Denitrifyingphosphorus was enhanced with the maximal specific phosphorus release rates of 14. 34, 8. 32 and 2. 32 mg（ P）·g（ MLVSS）^（-1）·h^（-1）in R1 ~ R3,respectively, and the maximal specific phosphorus uptake rates were 14.13 and 2.34 mg（ P）·g（ MLVSS）^（-1）·h^（-1）in R1,R2, respectively. In addition,Ca2＋ was proved to benefit for sludge granulation.