Effect of leachate inoculum on biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process

The biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process has become of great interest for biostabilization or biodrying. The study aimed at investigating the effect of leachate inoculum on the biopretreatment. During the hydrolytic stage, the inoculum addition at the ratio of leachate to waste (LWR) of 5% and 7% stimulated the start-up of hydrolysis and enhanced the hydrolysis rate by 27.4% and 24.2%, respectively; whereas the inoculation at LWR of 1% had almost no effect on the hydrolysis rate and the inoculation at LWR of 10% reduced the hydrolysis rate by 12.7%. During the subsequent aerobic stage, the inoculations at LWRs greater than 5% decreased organics degradation rate. As a whole, compared with none inoculation, the total degradation rates of organics for inoculating trials at LWRs of 5%, 7% and 10% decreased by 14.5%, 14.3% and 32.7%, respectively. Correspondingly, their net water removal rates were reduced by 4.4%, 5.8% and 19.0%. The inoculation at LWR of 1% could not significantly affect the biopretreatment. The inoculum addition at LWR of 5% and 7% could shorten hydrolytic stage and thus accelerate the whole combined process. Moreover, the inoculations at LWRs greater than 5% were favorable for lignocelluloses degradation.     

生物流化床预处理对饮用水致突变活性的影响

以Ｃ市市区内受污染的Ｎ河水为原水,在实验室内建立起生物流化床预处理－－传统工艺的组合净水工艺。对原水,传统工艺,生物流化床预处理,组合工艺的出水及其相应的氯化出水Ａｍｅｓ试验致突变性研究。以ＲＭ和水样比活性表示,非氯化水样的结果表明：传统工艺和生物预处理都会使原水的致突变性有所提高,后者的增幅大于前者;生物预处理能使两类致突变物尤其是碱基置换型致突变物发生有利于被后续传统工艺去除的变化,使组合工艺     

微污染原水生物预处理工艺中生物膜的形态和活性

研究发现微污染原水生物流化床预处理工艺中生物膜均匀覆盖于载体颗粒表面，厚度约为60—80μm，远小于污水生物处理工艺中的生物膜厚度；膜内微生物保持一定活性和对污染物的去除效率；以S0UR法测定的该条体下的生物膜活性远小于接种污泥的活性。     

水源中NH+4-N对生物预处理污染原水除NH+4-N效果影响研究

采用弹性填料微孔曝气生物预处理方法净化受污染的某饮用水源,探讨了水源水环境中NH4+-N变化对生物预处理除NH4+-N作用效果的影响。结果表明,水源水环境中的NH4+-N对生物预处理工艺除NH4+-N有一定的影响作用。     

微污染原水的生物流化床预处理技术试验研究

以二相颗粒活性炭生物流化床(FBBR)为反应器,对以有机物和NH4+N为主要污染物的某大城市内河原水进行了预处理试验研究,在HRT12～18min,气水比20～25∶1,回流比3～4∶1的条件下FBBR对CODCr、NH4+N、NO2-N、浊度、色度的去除率分别为4132%、100%、97%～100%、6880%、30%～50%,而且对NH4+N和NO2+N有较强的抗冲击负荷能力。