Preliminary Study of Thermal Treatment of Coke Wastewater Sludge Using Plasma Torch

LI Mingshu (李铭书); LI Shengli (李胜利); SUN Demao (孙德茂); LIU Xin (刘欣); FENG Qiubao (冯求宝)

doi:10.1088/1009-0630/18/10/09

Plasma Science and Technology > 2016 > 18(10): 1020-1026. > DOI: 10.1088/1009-0630/18/10/09

LI Mingshu (李铭书), LI Shengli (李胜利), SUN Demao (孙德茂), LIU Xin (刘欣), FENG Qiubao (冯求宝). Preliminary Study of Thermal Treatment of Coke Wastewater Sludge Using Plasma Torch[J]. Plasma Science and Technology, 2016, 18(10): 1020-1026. DOI: 10.1088/1009-0630/18/10/09

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Preliminary Study of Thermal Treatment of Coke Wastewater Sludge Using Plasma Torch

1School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 2Qingdao Research Academy of Environmental Sciences, Qingdao 266003, China 3State Grid Jiangxi Electric Power Research Institute, Nanchang 330096, China 4Universtar Science & Technology (Shenzhen) Co., Ltd, Shenzhen 518057, China

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Received Date: November 17, 2015

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Abstract

Abstract

Thermal plasma was applied for the treatment of coke wastewater sludge derived from the steel industry in order to investigate the feasibility of the safe treatment and energy recovery of the sludge. A 30 kW plasma torch system was applied to study the vitrification and gas production of coke wastewater sludge. Toxicity leaching results indicated that the sludge treated via the thermal plasma process converted into a vitrified slag which resisted the leaching of heavy metals. CO₂ was utilized as working gas to study the production and heat energy of the syngas. The heating value of the gas products by thermal plasma achieved 8.43 kJ/L, indicating the further utilization of the gas products. Considering the utilization of the syngas and recovery heat from the gas products, the estimated treatment cost of coke wastewater sludge via plasma torch was about 0.98 CNY/kg sludge in the experiment. By preliminary economic analysis, the dehydration cost takes an important part of the total sludge treatment cost. The treatment cost of the coke wastewater sludge with 50 wt.% moisture was calculated to be about 1.45 CNY/kg sludge dry basis. The treatment cost of the coke wastewater sludge could be effectively controlled by decreasing the water content of the sludge. These findings suggest that an economic dewatering pretreatment method could be combined to cut the total treatment cost in an actual treatment process.
- thermal plasma,
- plasma torch,
- sludge,
- syngas,
- leachate toxicity

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