水热法污泥脱水的中试研究

发布时间：2018-01-01 18:35

本文关键词：水热法污泥脱水的中试研究　出处：《辽宁科技大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 污泥脱水 水热法 BMP 焚烧系统

【摘要】：水热法污泥脱水的中型试验,主要是解决上海老港废弃物处置有限公司填埋场(以下简称:填埋场)长期搁置在填埋坑中的含水率80%左右的市政污泥的脱水问题。中试通过对上海竹园污水厂的含水率80.6%原始污泥进行水热预处理,再利用板框式双模片压滤机压滤脱水处理,得到卸料污泥,脱水污泥滤液。在水热压滤工艺中,进行控制变量法分析得出原始污泥的水热压滤处理的最佳工艺参数为:水热温度为180℃,维持45min;水热泥在80℃高温进料,最大压榨压力为0.80MPa,维持45min;抽真空干燥30min。该条件参数下,卸料泥饼的含水率为32.6%,泥饼最大厚度为2.50cm,完成符合污泥焚烧工艺的含水率要求。在最佳水热压滤工艺条件参数下,对上海老港填埋场的混合原始污泥进行水热预处理,再利用板框式双模片压滤机压滤脱水处理的中型试验。中试结果显示:卸料泥饼含水率为40.5%,泥饼厚度为2.21cm,同样符合污泥焚烧工艺的含水率要求。对污泥滤液进行生物化学甲烷势(BMP)的试验。试验结果表明:180℃水热后的污泥滤液在BMP实验前后,SCOD和TCOD的去除率最大分别为87.23%和86.54%;180℃水热后的污泥滤液最易于厌氧消化,停留时间短,处理效率高;180℃水热后压滤所得的污泥滤液的生物可降解率最高为85.76%。通过Aspen Plus设计的水热焚烧系统模拟计算结果表明:若日处理量100吨,系统连续稳定运行,最佳水热压滤条件下所得泥饼含水率32.6%。则泥饼输入焚烧系统质量1.32kg/s,所需蒸汽量1.63kg/s,产生蒸汽量2.71kg/s,对外输出蒸汽量1.08kg/s,能量有效利用率为19.15%,焚烧过程中无需辅助燃料(助燃煤)。最佳水热压滤条件下所处理的原始污泥含水率不得超过87%(包括87%),否则该系统的焚烧环节将需要添加辅助燃料,才可以维持水热焚烧系统的正常运行。但是无论原始污泥含水率为多少,该系统都起到了能源回收,循环利用的经济效益。
[Abstract]:The medium test hydrothermal method of sludge dewatering, mainly solves the Shanghai Laogang waste disposal Co. Ltd. (hereinafter referred to as: landfill landfill) long delayed dehydration of municipal sludge in about 80% of the water in the landfill pit rate. Based on the test water rate of 80.6% original sludge hydrothermal pretreatment with Shanghai Zhuyuan sewage the factory, using frame type double membrane filter press dewatering by discharging sludge, sludge dewatering filtrate. In hot water filtration technology, analyze the original sludge water heat treatment filter optimal process parameters: variable control hot water temperature is 180 DEG C, maintain 45min; hydrothermal mud in the high temperature of 80 DEG C feed, maximum squeeze pressure is 0.80MPa, maintain 45min; vacuum drying 30min. the condition parameters, water discharging material cake rate is 32.6%, the maximum thickness of mud cake is 2.50cm, complete with the water ratio of sludge incineration technology At best hot water filtration technology parameters, the mixed raw sludge in Shanghai Laogang landfill site of hydrothermal pretreatment, and then using the frame type double membrane filter press dewatering tests. Test results showed that the discharge of mud cake moisture is 40.5%, mud cake thickness is 2.21cm. The same with water content of sludge incineration technology rate. Biochemical methane potential (BMP) of sludge filtrate experiment. The experimental results show that the hot water of 180 DEG C after sludge filtrate in BMP before and after the experiment, SCOD and TCOD of the maximum removal rate were 87.23% and 86.54%; sludge filtrate water of 180 DEG C after the heat most easily anaerobic digestion, short retention time, high processing efficiency; hot water of 180 DEG C after biodegradable sludge filtrate the filter for the highest rate of 85.76%. by hydrothermal Aspen Plus design showed that the calculation results of simulated incineration system: if the daily processing capacity of 100 tons, system. Continuous and stable operation, the optimal hydrothermal conditions the filter cake moisture content 32.6%. mud cake quality 1.32kg/s input system, the amount of steam of the steam quantity 1.63kg/s, 2.71kg/s, 1.08kg/s output steam quantity, the energy availability is 19.15%, without the incineration process (combustion coal) auxiliary fuel. The best treatment hot water filter under the condition of the original sludge water content shall not exceed 87% (including 87%), otherwise the incineration aspects of this system will need to add auxiliary fuel, can maintain the normal operation of the hydrothermal incineration system. But whether the original moisture content of sludge, the system plays the energy recycling, recycling economic benefits.

【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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