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污水处理厂污泥处理与利用研究
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摘要
当今世界,随着人口的快速增长和经济的迅速发展,自然资源的消耗随之加快,废弃物的利用技术越来越被各国所关注和重视,而我国的自然资源短缺状况尤为严重。因此,废弃物的资源化利用研究在我国就显得更为重要。城市污水处理厂的污泥是城市化进程中产生的固体废弃物,这些城市固体废弃物的处理处置是一个必须尽快解决的问题。在我国的许多城市,有大量的污水厂污泥没有安全出路,容易对环境造成二次污染,而目前国内的一些污泥堆肥厂由于技术含量低、运行成本高、堆肥产品销售困难等原因,其作用未能充分地发挥。因此,利用城市污水处理厂污泥堆肥化生产有机复混肥的资源化研究,对国民经济的发展就有着十分重要的意义。在系统总结这一领域研究现状的基础上,本文对下列问题进行了研究。
     基于城市污水厂污泥富含作物生长所需的营养成分和有机质,有害重金属元素低,其它元素符合国家农用标准这一事实,本文提出了利用污水厂污泥进行堆肥化后生产有机复混肥的观点。通过生产优质有机复混肥来保证污泥的有效、持续利用。
     通过对堆肥化过程中微生物特征进行的研究,认为堆肥化过程中对微生物活动影响最大的因素是有机物和温度,其次是pH值。通过研究堆肥化过程中微生物与有机质降解的关系,认为中温条件对有机物降解更为有利,且把中温堆肥过程分为中温过渡、中温和中低温过渡等三个阶段,并从无害化目的出发,利用堆肥化产品进行有机复混肥的研制。根据有机复混肥的特点,结合堆肥产品成分、土壤性质及作用所需的营养状况,确定了生产有机复合肥的最佳配比,并研制了水稻和玉米专用有机复合肥,并进行了田间实验,结果表明:所生产的有机复混肥对水稻有较好的增产效果。
     不同堆肥试验(填充料、填充料配比、通风量)的结果表明,污泥与稻草、木屑和玉米芯混合均能成功进行污泥堆肥化,其中以木屑效果最好,表现在升温速度快,第3天温度可上升至55℃,且可维持8~11天,35天基本达到腐熟。成功进行污泥堆肥的最佳工艺参数为污泥与木屑的体积比为1:1或1:3,通风量
    
    为o.35旷几mill,通风频率为每3h通风3伽*。污泥堆肥腐熟以后结构疏松,且
    无臭味。堆肥过程中的高温能使堆肥病原菌(大肠杆菌计)大幅度灭活,达到国
    家高温堆肥卫生标准。污泥堆肥腐熟后,pH、EC有一定程度的下降;挥发性固
    体、总有机碳、水溶性有机碳的含量约降至堆肥初始的50o/左右;氨态氮、有机
    氮含量先上升后下降,呈抛物线的变化趋势;而硝态氮含量的变化正好相反,先
    下降后急剧升高;通常堆肥腐熟以后,全氮、全磷、全钾含量提高;污泥在堆肥
    35天以后,水芹oresS)种子发芽指数达50%左右,在堆肥结束时,GI均接近或
    达到80%以上。填充料的加入稀释了污泥重金属的含量。
     堆肥化是处理有机固体废弃物的主要方法之一,评价堆肥腐熟的指标是堆肥
    研究的重要课题。现有的评价方法中,有些费时、繁琐,有些受堆肥原料不同的
    限制而不能普遍应用。
     通过对污泥堆肥过程中堆肥的物理、化学和植物毒性的分析,作者提出了一
    种简单方便、快捷准确的污泥堆肥腐熟度评估指标:堆体的温度必须经过高温阶
    段并维持7天左右,随后温度下降并趋于平缓,堆体种子发芽指数达65%以上,
    污泥堆肥腐熟以后,结构疏松,无污泥固有的臭味,C/N-OTg比值在5~7之间,
    NO。’/NH。卜4,完全满足这几个条件的污泥堆肥可以判定达到完全腐熟,无生物
    毒性。
     本文通过对生产的有机复混肥进行农作物的施用实验,在作物秸杆和谷物进
    行重金属含量检测,结果未发现异常,说明是施用有机复混肥在重金属污染方面
    是安全的。
Today, with the rapid growth of the population and the quick development of the economy,the natural resources in the world are being consumed swiftly and the technology of reuse of waste is being attached more importance by many countries.The lack of the natural resources in China is so serious that it has made the research of resources reuse even more important than ever. The sludge of urban sewage disposal plant, living garbage and coke breeze are the waste produced in the process of urbanization, and the treatment and disposal of those wastes are unavoidable problems eventually. Because there are a lot of the sludge of urban sewage disposal plant and living garbage, which could not find safety way to go,and that is very easy to cause the secondary pollution. At present, some of national sewage and garbage plant cannot bring into play owing to their lower technology, higher running cost and more difficult product distribution. So, there is important significance to carry through the research of resources r
    euse producing organic combined fertilizer by use of the sludge of urban sewage disposal plant, living garbage and coke breeze. Based on systematic summery to the research actuality in this fields, the thesis make researches about the following questions.
    Based on the fact that there is abundant nourish component and organic matter in the sludge of urban sewage disposal plant for crops to grow and there is lower content of heavy metals, which can meet the national agricultural standards, the aurthor put forward the viewpoint using the sludge of urban sewage disposal plant to produce organic combined fertilizer.
    The thesis also makes research to characteristic of microorganisms in the process of composting, concludes that the most important factor is organic matter and temperature and the next factor is pH. Through the research of the degradable relationship between microorganisms and organic matter in compost, the author think it more favorable in temperature the condition of middle temperature to degrade organic matter, and divide compost to middle transition pHase, middle temperature
    
    
    pHase and middle-low temperature transiton pHase.For the sake of innouity aim,the research uses compost production to develop organic cumomed fertilizer. According to the characteristic of organic combined fertilizer and integrating compost product component, soil property and nourish condition of crops, the author defines the best ratio of organic combined fertilizer and technics flow of producing organic combined fertilizer. The author also develops special organic fertilizer in rice, and does fiels experiments using oranic combined fertilizer. The results of the experiments show that those fertilizers have fairly effect on increasing production to rice.
    Herb residues or wood chips could be used as bulking agents through forced aerated static static pile model of municipal sewage sludge, but the former had better effects. The temperature of above 55C in a pile could be observed on the third day after composting and kept 8 to 11 days. Based on the consequent experiments including the effects of bulking agents amended into the sludge and the various ventilation rate on composting, the optimal technological parameters were proposed:The volume ratio between sludge and agents were 1:1 or 1:3, and the ventilation rate was 0.35m3/t.min with frequency of 30min per 3 hours. The cress seed germination index (GI), used as indicators of pHytotoxixity and maturation of compost, exhibited that the sludge compost was stabilized and mature near 40th day of composting, when 80% of GI was obtained.
    Compsting is one of the most acceptable methods for treating orgtanic solid waste, but maturity assessment is still a main problem of this pratice.
    In this study, pHysical, chemical and biological indexes were used to find some easy methods to assess the maturity of composting.Chemcal indexes depend on the raw materials, pHysical indexes need a long time to determine. Nutrients were also
    determined to search the transformation principl
引文
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