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城市污水处理厂污泥处理及农用资源化的研究
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摘要
随着工业化进程的加快,环境污染问题日益严重。各城市污水处理厂的大量兴建,有效缓解了城市生活污水和工业废水对环境的污染。但污水处理过程中产生的大量污泥很容易对环境造成二次污染,因此研究污泥的处置十分必要,由于污泥中含有丰富的氮、磷、钾等营养元素,其资源化农用已经成为当今研究的热点。
     由于不同污水处理厂产生的污泥情况不一样,本文对污泥的性质、特点等进行了分析,阐述了国内外污泥处置现状及研究进展,并对当今污泥农用的影响因素进行概述。
     采用室内分析和田间生物试验,研究了热喷处理污泥及其复混肥的养分供应能力及它们在农地上施用对土壤肥力、青菜产量及其品质的影响。结果表明:热喷处理能有效杀灭污泥中病原物,除臭,并可使污泥中水溶性有机碳和速效氮磷含量分别提高78%、18%和36%。施用热喷处理的污泥及其复混肥可以提高青菜的产量、品质。施用热喷污泥制成的复混肥少但比等养分的无机复合肥多增产38%,而且青菜体内Vc和水溶性总糖等营养品质也有明显的提高。NO_3~-却只有无机复合肥处理的一半左右。污泥经热喷处理有利于提高污泥中养分的生物有效性,特别是热喷污泥制成的复混肥氮磷养分利用率显著高于无机复合肥。
     施用热喷处理的污泥及其复混肥可以改善土壤肥力。施用热喷处理的污泥及其复混肥均可以提高土壤N素、P素、K素的含量。施用热喷污泥的土壤的有机质的含量比施用污泥的土壤有机质的含量增加明显。施用热喷处理的污泥及其复混肥可以提高作物对N素的利用率,施用热喷污泥后使青菜对N素的利用率比施用污泥后使青菜对N素的利用率的效果更高。施用污泥复混肥比施用热喷处理的污泥的效果好。施用污泥复混肥的青菜对N素的利用率比施用热喷污泥高,施用污泥复混肥的土壤含P量、速效K量比施用热喷污泥的高。
With the acceleration of the process of industrialization, the problem of environmental pollution has become increasingly worse.In recent years,many municipal sewage treatment plants have been built, which effectively alleviate the pollution of water environment caused by the discharge of municipal sewage and industrial wastewater. At the same time, a large amount of sewage sludge produced during the process of sewage treatment may result in second pollution to the environment. Therefore,the study on sewage sludge disposal is necessary,because there are high quality of nutrition elements such as nitrogen, phosphorus and kalium, the agricultural utilization of sewage sludge has become an important topic in current research.
     Because the sludges generated by different sewage treatment plants are different, the sludge properties, characteristics,etc.were analyzed, the status quo at home and abroad and research progress of disposal of sludge were illustrated, as well as the impact of today's Sludge overview of the factors.
     Sewage sludge was pretreated by steam explosion and then developed into the organo-inorganic compound fertilizer through incorporating with a given amount of chemical fertilizers. The field experiment was conducted to assess the effect of pretreated sludge and the compound fertilizer on the no heading Chinese cabbage yield,soil fertility and nutrient bioavailability. The process of steam explosion can eliminate pathogen and disgusted odor in sewage sludge within a relative short time. The loss of total organic C,N and P of sewage sludge is negligible by steam-exploded treatment,but the dissolved organic C.available N and P in the pretreated sludge can be increased significantly by 78%,18% and 36%,respectively. Application of thermal spray processing of sludge and fertilizer can increase vegetable yield and quality.Compared to inorganic compound fertilizer on basis of equal nu-trient input,the application of the sludge compound fertilizer elevated vegetable yield by 38%.the bioavailablity of N and P and reduced nitrate content in plant by about 50%.The higher concentration of Vc and total sugar in the plants grown in the plots amended with sludge.pretreated sludge.and sludge compound fertilizer were also observed in this study.
     Application of thermal spray processing of sludge and fertilizer can improve soil fertility. Application of thermal spray processing of sludge and fertilizer can enhance soil N prime,P prime, K prime content. Sewage sludge treated by thermal spraying to increase soil organic matter content than those of sludge treated by thermal spraying clear. Application of thermal spray processing of sludge and fertilizer can increase crop utilization of N elements,sludge treatment by thermal spraying of the N elements so that the utilization of vegetable than by the thermal spraying of sludge treatment, without the effect of higher.Application of sewage sludge fertilizer application of thermal spray treatment than the sludge effect is good. Application of sewage sludge fertilizer for vegetables and the utilization of elements of N application of thermal spray sludge than the high application of sewage sludge fertilizer in the soil containing the amount of P, available K than the high sludge application of thermal spray.
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