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湿式氧化处理剩余污泥的研究 总被引:15,自引:0,他引:15
采用湿式氧化处理剩余污泥 ,以化工污泥为对象 ,研究了温度、压力、反应时间对污泥过滤性能和沉降性能的影响 ,以及污泥中有机物、氮、磷、硫的变化情况 ,并采用扫描电镜对湿式氧化前后污泥的结构进行了分析。选择了比较温和的湿式氧化条件 ,此条件下可使污泥中的有机物大部分氧化并转入到水相 ,气固液分离后 ,上清液可生化性较好 ,BOD/COD >0 5 1;气体可直接排入大气 ,无二次污染 ,固相的沉降性能和过滤性能得到了明显改善 ,污泥比阻为 2 4 3× 10 8s2 /g。采用该工艺条件对炼油污泥和城市污泥进行处理也获得了良好的效果。 相似文献
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本研究主要探讨低温(<200℃)低压(<25kg/cm~2)湿式氧化对不同有机污泥各种性能的改善效果。试验表明: 1.低温低压的湿式氧化试验对于污泥中悬浮固体物质的分解率和溶解率都有不同程度的影响,随着温度升高,固体物质的分解率和溶解率都呈上升趋势,且后者的增加速率大于前者。200℃时,毛纺厂污泥固体物质溶解率为40.8%,分解率为39.4%;燕化厂污泥固体物质溶解率为43.9%,分解率为27.5%(以COD计),这说明在本试验所设定的条件下,湿式氧化的主要作用在于对污泥中固体成份的溶解。 2.污泥比阻随温度上升而急剧下降,200℃时,污泥的比阻比未处理的污泥比阻降低了一个数量级,这表明,湿式氧化对污泥的脱水性能有明显的改善效果,而脱水性能提高,可以减小脱水泥饼的体积,有利于后续处理。 3.经过湿式氧化处理后,污泥出水上清液中的COD、BOD、VDS均随温度升高而呈明显的上升趋势,200℃时,上清液(毛纺厂)BOD/COD平均值达到0.46,因此,反应后的污泥上清液具有较好的可生化性。 4.经过湿式氧化处理后,污泥出水上清液中的有机酸都有不同程度的增加,而且,有机酸浓度在甲烷菌适宜的范围内。在有机酸的组分中,乙酸量占总有机酸量的50%以上,这都有利于提高甲烷产生量。 5.上清液的可生化性能良好,有机物的去除率达到78%。 6 相似文献
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以某初沉池污泥厌氧消化系统为研究对象,通过对其5年的运行数据进行分析,研究了厌氧消化系统的效能及主要影响因素。结果表明,初沉池污泥中挥发性固体含量占总固体含量的比例(VS/TS)在40%~80%,且随季节呈周期性变化;污泥中可降解有机物的降解率为98.9%~99.0%,消化气产量与进泥量正相关,消化气中甲烷和二氧化碳的含量为68.6%~69.2%和23.9%~24.6%。随着污泥停留时间(SRT)的延长,消化池容积产气率下降,污泥产气率和VS去除率升高;进泥含固率和VS/TS的增高使消化池容积产气率、污泥产气率和VS去除率呈现增大趋势。因此,为保持厌氧消化池高效产气,进泥含固率宜控制在5%左右,SRT宜控制在30d左右。 相似文献
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城市污水污泥处理处置系统的技术经济分析与评价(下) 总被引:1,自引:0,他引:1
3 污泥焚烧系统的分析与评价 焚烧法是一种高温热处理技术,即以一定的过剩空气量与被处理的污泥在焚烧炉内燃烧进行氧化反应,污泥中的有机质和有毒有害物质在高温下氧化、热解而被破坏,是可同时实现污泥无害化、减量化、资源化的一种技术.在欧盟污泥焚烧比例在不断上升,并逐渐成为最主要的污泥处置手段之一[4].污泥焚烧分为污泥单独焚烧和混合焚烧,其中混合焚烧是指在水泥厂、垃圾焚烧厂、热电厂或工业锅炉与其他物料混合进行焚烧. 相似文献
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以好氧硝化污泥为培养污泥,采用经稀释的猪场废水启动厌氧氨氧化反应器,经过125 d的培养,根据ASBR反应器出水水样监测结果显示:ASBR反应器稳定运行后NH4+-N、NO2--N的去除率分别达到91.7%、92.0%,说明采用ASBR反应器,接种好氧硝化污泥可成功启动厌氧氨氧化反应器,验证了利用厌氧氨氧化工艺处理类似养殖废水的高氨氮废水的可能性. 相似文献
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污泥燃料化发电可行性探讨 总被引:1,自引:0,他引:1
介绍了污泥的干化焚烧、污泥低温热解(低温热化学转化(热解)、污泥制氢和污泥改质等污泥燃料化技术.分析了污泥干化焚烧发电的可行性,指出干化焚烧发电技术是一种可行的污泥处理技术,得出了污泥发电可以通过技术整合,实现污泥处理的高效化的结论. 相似文献
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Recycling of sludge with the Aqua Reci process. 总被引:3,自引:0,他引:3
Supercritical Water Oxidation (SCWO) is an innovative and effective destruction method for organics in sewage sludge. The SCWO process leaves a slurry of inorganic ash in a pure water phase free from organic contaminants, which opens possibilities for a simple process to recover components like phosphates and/or coagulants from the sewage sludge, a process marketed as the Aqua Reci. In a continuous pilot plant for the SCWO process digested sludge has been treated. The ash has been extracted in lab- and pilot scale with both caustic and acids in order to recover phosphates and coagulants. The particle size of the inorganic contaminants in the water after the SCWO process is between 1-10 microm, which means that it is very reactive. The phosphate, and partly the aluminium, can be extracted with caustic as iron and heavy metals are completely insoluble in caustic. This is a method to separate the phosphates from the rest of the contaminants. However, high calcium content will bind the phosphate as calcium phosphate insoluble in caustic. In most cases the calcium content is too high and the best solution is to dissolve phosphates and all metals with sulphuric acid. From this solution first iron phosphate can be separated and thereafter in a second step aluminium and finally heavy metals in a third step. Iron can be separated from the phosphate, either by leaching the phosphate with caustic off to sodium phosphate leaving a precipitate consisting of iron hydroxide, or the iron phosphate can be dissolved in hydrochloric acid followed by a liquid extraction process where ferric chloride can be separated leaving a phosphoric acid. By the acid dissolving process it is possible to recover phosphate, iron, aluminium, and heavy metals from the inorganic since the Aqua Reci process only leaves a silica residue representing about 10% of the DS content in the original sludge. 相似文献
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污水生化处理过程中涉及到的变量很多,但是真正可以用于调控污水处理厂运行过程的变量却很少,这使得污水处理厂的调控方式不是很灵活。重点研究了污泥总量控制,分别讨论了剩余污泥排放量、回流污泥排放量这两个操作变量在调控污水处理过程中的表现。 相似文献
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太湖环保疏浚工程产生大量高含水率的疏浚底泥,处置不当就造成十分严重的二次污染。由于疏浚底泥重金属含量基本低于农用污染物控制标准,合理施用即可改良土壤、节约大量处置费用,不仅能够解决我国土壤退化的问题,还能带来良好的经济效益。为实现底泥的快速脱水,便于资源化利用,同时针对疏浚底泥渗水性差致使底部排水法困难的缺点,采用了絮凝剂、脱水剂与真空抽滤相结合的方法处理疏浚底泥。试验结果表明:加药实验组在520h内可将疏浚底泥的含水率从70%降至41.9%,而不加入药剂的空白组实验含水率只降至60.3%就无法继续脱水。所用脱水剂不与絮凝剂、淤泥和淤泥中的有机质等成分发生化学反应,且对出水水质无明显影响,出水的浊度、CODMn以及pH值在废水排放的规范之内。 相似文献
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Direct energy recovery from primary and secondary sludges by supercritical water oxidation. 总被引:3,自引:0,他引:3
Supercritical water oxidation (SCWO) oxidizes organic and biological materials virtually completely to benign products without the need for stack gas scrubbing. Heavy metals are recovered as stabilized solid, along with the sand and clay that is present in the feed. The technology has been under development for twenty years. The major obstacle to commercialization has been developing reactors that are not clogged by inorganic solid deposits. That problem has been solved by using tubular reactors with fluid velocities that are high enough to keep solids in suspension. Recently, system designs have been created that reduce the cost of processing sewage sludges below that of incineration. At 10 wt- % dry solids, sludge can be oxidized with virtually complete recovery of the sludge heating value as hot water or high-pressure steam. Liquid carbon dioxide of high purity can be recovered from the gaseous effluent and excess oxygen can be recovered for recycle. The net effect is to reduce the stack to a harmless vent with minimal flow rate of a clean gas. Complete simulations have been developed using physical property models that accurately simulate the thermodynamic properties of sub- and supercritical water in mixtures with O2, N2, CO2, and organics. Capital and operating cost estimates are given for sewage sludge treatment, which are less costly than incineration. The scenario of direct recovery of energy from sludges has inherent benefits compared to other gasification or liquefaction options. 相似文献
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结合北京市污泥堆肥土地利用现状.研究了污泥堆肥对土壤环境及高羊茅(Festuca arundinace。)的影响。旨在为北京市污泥堆肥用于高羊茅园林生产提供理论依据,促进资源再利用。研究结果表明.施用污泥堆肥增加了高羊茅栽植小区土壤养分含量,特别是土壤中有机质含量增加明显,与空白对照相比增加了43.9%~73.2%,对土壤养分状况具有一定的改良效果;施用污泥堆肥后,高羊茅栽植小区土壤中重金属含量虽有不同程度的增加。但均远低于相关标准限值.且土壤重金属污染综合指数小于土壤安全限值0.7.表明种植小区土壤未受到重金属污染:施用污泥堆肥对高羊茅生长具有一定的促进作用.与空白对照相比.高羊茅总生物量增长率为16.7%~50.0%。综合分析试验结果,确定污泥堆肥用于高羊茅的适宜施用量为2kg/m^2。 相似文献