Drying characteristics of deep dewatered sludge

被引：0
|
作者：
Wang J. [1 ]
Liu H. [1 ]
Liu P. [1 ]
Zhang Q. [1 ]
Lu G. [1 ,2 ]
Hu H. [1 ]
Yao H. [1 ]
机构：
[1] State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, Hubei
[2] China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan, 430074, Hubei
来源：
Liu, Huan (huanliu@hust.edu.cn) | 2017年 / Materials China卷 / 68期
基金：
中国国家自然科学基金;
关键词：
Condensate; Deep dewatering; Drying; Heating value; Polluting gas; Sewage sludge;
D O I：
10.11949/j.issn.0438-1157.20170069
中图分类号：
学科分类号：
摘要：
Composite conditioners in deep-dewatered sludge have an important influence on its drying characteristics. In order to obtain deep-dewatered sludge, the raw sludge was pretreated by four kinds of typical composite conditioners and then dewatered. At the N2 atmosphere and 473 K, the effects of the composite conditioners on the emission characteristics of moisture and pollutants, as well as the drying products properties of gas, liquid and solid phase, were investigated. The results showed that the composite conditioner could effectively reduce the water content of dewatered sludge and accelerate the water release, shorting the drying time as well. Conditioning process in the acid, alkali and strong oxidizing environment destroyed the organic structure of sludge so that the aromatic -or thiophene-S in sludge could transfer into more stable sulfonic acid- or sulfone-S. Also, the alkaline environment allowed the dissolved acidic sulfur-containing gas to be fixed, thereby reducing the amount of sulfur-containing gas released during drying. But the releasing rate of ammonia was accelerated. Because of the high concentration of sulfur-containing gases, nitrogen-containing gases and volatile organic compounds in the drying exhaust gas, the condensate had a high pH and COD accompanied by malodor, and thus needed to be disposed before it can be discharged. The lower heating value of sludge can be 6.79-13.18 kJ·g-1 of dry sludge and efficiently maintained under the drying temperature of 473 K so that the dried sludge can provide a kind of renewable energy. © All Right Reserved.
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页码：2491 / 2500
页数：9
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