磨盘山净水厂污泥脱水特性、制备陶粒及效能研究

发布时间：2018-03-16 01:06

  本文选题：给水污泥　切入点：脱水　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国不断的发展,人们对自来水的需求量也随着增多,因此给水处理所产生的污泥量也随之增加,合理的将污泥资源化利用是目前急需解决的问题。磨盘山净水厂的水处理量较大,净水厂每日所生产的干泥量为28 t,若直接排放对给水污泥这一资源是很大的浪费。磨盘山水库处于寒区,其水质特点为低浊度高色度水,污泥颗粒的粒径在40?m-90?m之间,粒度非常细小,容易进一步资源化利用。对污泥的脱水特性进行研究,比较三种脱水剂PAM、PAC、PFC的脱水效果,得出浓度为0.2%的阳离子型聚丙烯酰胺投加量为3 m L时污泥含水率达到80%时,所需的投加量最少。将脱水至80%的污泥作为主要原料以膨润土作为辅助原料进行陶粒的制备,得出原料比为70%:30%(含水率80%的给水污泥:膨润土),焙烧温度为1100℃条件下的陶粒对氨氮的吸附最好。利用最佳参数所焙烧的陶粒对废水中的氨氮进行吸附试验,研究了反应时间对氨氮吸附的影响以及投加量对氨氮吸附的影响。试验结果显示随着反应时间的增加,陶粒对氨氮的吸附量也增加,但当达到某一临界点时,吸附量基本没有变化,该点为吸附的平衡浓度,为7.2013 mg/L;随着陶粒投加量的增加,废水中氨氮不断的被吸附掉,其去除率升高,但吸附量却随着投加量的增加而不断地降低。对饱和吸附的陶粒进行解吸再生试验,结果表明用给水污泥制备的陶粒经过四次解吸再生后还可以用于去除氨氮,由此可见污泥又进一步得到了资源化。将试验数据与一级动力学模型和二级动力学模型进行拟合,得出给水污泥陶粒对氨氮的吸附符合二级动力学模型,是化学吸附。对其进行进一步分析得知颗粒内扩散是吸附过程的限速步骤,但不是唯一的控速步骤。最后对陶粒制备的经济效益进行了系统的分析,进一步说明了其资源化利用的价值。
[Abstract]:With the continuous development of our country, people's demand for tap water is also increasing, so the amount of sludge produced by water treatment is also increasing. The rational utilization of sludge is an urgent problem at present. The water treatment capacity of Mopanshan Water purification Plant is large. The dry sludge produced by the water purification plant is 28 t per day. It is a great waste to discharge sludge to feed water directly. The water quality of Moanshan Reservoir is in cold area, its water quality is characterized by low turbidity and high color water, and the diameter of sludge granule is 40? M-90? The dewatering characteristics of sludge were studied, and the dehydration effects of three dehydrators, PAM- PAC- PFC, were compared. When the concentration of cationic polyacrylamide is 3 mL, the minimum amount of sludge is needed when the water content of sludge reaches 80 mL. The sludge with dehydration to 80% is used as the main raw material for the preparation of ceramsite with bentonite as the auxiliary raw material. The results show that the ratio of raw material to raw material is 70: 30 and the ratio of feed water sludge to bentonite is 80%. The best adsorption rate of ammonia nitrogen is obtained when the calcination temperature is 1100 鈩，

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