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首页> 外文期刊>Journal of Residuals Science & Technology >Reduction of the quantity of sewage sludge and increase in the digester gas production
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Reduction of the quantity of sewage sludge and increase in the digester gas production

机译：减少污水污泥量并增加沼气产量

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Almost half the operating costs in German wastewater treatment plants fall to the areas "Energy" and "Treatment and disposal of sewage sludge". Therefore, with the Emschergenossenschaft and Lippeverband, various innovative processes have been tested for the reduction of the quantity of sewage sludge and for the increase in production of digester gas and energy. Sewage sludge disintegration, using various processes (ball mills, ultrasonic waves, lysate centrifuges and ozone), has been applied on a large-scale in parallel operation. Increases of the degree of degradation and of gas production up to a maximum of 20% could be achieved. However, as a rule, this is not sufficient in order to reclaim the energy and to reduce the quantity of sewage sludge to such an extent that an economical solution results. The addition of enzymes has also been investigated in a large-scale parallel operation. The positive effects determined (increase of the degree of degradation and of the production of digester gas) were here also too small for an economical application. Sewage sludge digestion at increased temperature (up to 45 degrees C) has been investigated in semi-industrial parallel trials. An increase of the degree of degradation and of the digester gas production could also be established, however, the dewatering capability of the sludge deteriorated. The quantity of sludge could also be reduced through an aerobic post-treatment of the digested sludge and even the clewatering capability could be improved. At the same time the nitrogen return loading of the wastewater treatment plant can be reduced. Nevertheless, based on the results of the large-scale trials, no economic efficiency is achieved for the process. Through co-fermentation (joint treatment of biogenic wastes in the digester) the production of digester gas can be increased strongly. For more than two years wastes containing fats have been jointly treated in the Hamm wastewater treatment plant of the Lippeverband. The increased production of digester gas is utilised by an additional combined heating plant and, through this, the power generation is increased by ca. 80%.
机译：德国废水处理厂的运营成本几乎有一半属于“能源”和“污水污泥的处理与处置”领域。因此，使用Emschergenossenschaft和Lippeverband，已经测试了各种创新工艺，以减少污水污泥的量，并增加沼气和能源的产量。使用各种工艺（球磨机，超声波，裂解液离心机和臭氧）分解污泥的方法已大规模并行应用。降解程度和产气量的增加最多可达到20％。然而，通常，这不足以回收能量并减少污水污泥的量，以致于产生经济的解决方案。还已经在大规模并行操作中研究了酶的添加。在此，所确定的积极效果（降解程度的增加和消化器气体的产生）对于经济应用而言也太小。在半工业并行试验中，已经研究了在升高的温度（最高45摄氏度）下消化污泥的方法。还可以确定降解程度和消化器气体产量的增加，但是污泥的脱水能力下降。还可以通过对消化后的污泥进行好氧的后处理来减少污泥的量，甚至可以提高清水能力。同时，可以减少废水处理厂的氮气回流负荷。然而，基于大规模试验的结果，该方法没有实现经济效率。通过共同发酵（沼气池中生物废物的联合处理），可以大大提高沼气的产量。两年多来，在Lippeverband的Hamm废水处理厂对含脂肪的废物进行了联合处理。沼气产量的增加被一个额外的联合供热厂利用，通过这种方式，发电量增加了约。 80％。

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