深度脱水污泥的热干化特性

发布时间：2018-01-03 06:15

本文关键词：深度脱水污泥的热干化特性　出处：《化工学报》2017年06期 　论文类型：期刊论文

【摘要】：深度脱水污泥中调理剂对其干化特性有着重要影响。实验采用4种典型复合调理剂对污泥进行预处理,制得脱水污泥,在N_2气氛、473 K条件下,探究调理剂对污泥干化过程中水分和污染物释放以及干化气、液、固产物特性的影响。结果表明,所用复合调理剂均可以有效降低脱水污泥含水率,加快干化阶段水分释放速率;调理过程中的酸碱及强氧化环境能破坏污泥中的有机结构,使污泥中的芳香族或噻吩S转化为更加稳定的磺酸或砜类S,且调理后的碱性环境让溶解的酸性含硫气体固定,从而使得干化时含硫气体释放量减少,但会加速氨气的释放。干化时复杂的气相产物溶解于冷凝液使其具有较高的pH以及COD并伴有恶臭,需进行进一步处理;污泥热干化后样品热值降低量在3.63%以内,不影响其能源化利用。
[Abstract]:Conditioning agent in deep dewatered sludge has an important influence on its drying characteristics. Four typical compound conditioners were used to pre-treat sludge to produce dewatered sludge. Under the condition of N _ 2 atmosphere of 473K, the dewatered sludge was prepared. The effects of conditioning agents on the release of water and pollutants, as well as the characteristics of dry gas, liquid and solid products during sludge drying were investigated. The results showed that the compound conditioning agents could effectively reduce the moisture content of dewatered sludge. Accelerating the water release rate in drying stage; The organic structure of sludge can be destroyed by acid alkali and strong oxidation environment during the conditioning process and the aromatic or thiophene S in the sludge can be transformed into more stable sulfonic acid or sulfone S. And the alkaline environment after conditioning allows the dissolved acid sulfur-containing gas to be fixed, thus reducing the amount of sulfur-containing gas released during drying. But it will accelerate the release of ammonia. The complex gas phase product dissolved in condensate during drying makes it have higher pH and COD with bad odor, so it needs further treatment. After heat drying, the calorific value of the sludge decreased within 3.63%, which did not affect its energy utilization.
【作者单位】：华中科技大学能源与动力工程学院煤燃烧国家重点实验室;华中科技大学中欧清洁与可再生能源学院;
【基金】：国家自然科学基金项目(51506064,51661145010,51606075)~~
【分类号】：X703
【正文快照】： 引言近年来,随着污水处理规模的逐渐扩大,副产物污泥的产量也急剧增加,对其合理的处置具有非常重要的环境意义和经济价值。污泥的高含水率是其处置的瓶颈之一[1-3],多种处置方式都对污泥的含水率提出了更高的要求,因此污泥经脱水后往往还需进行干化处理。污泥干化过程的主要目

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