Evaluation of the Combined Process of Aammonia Distillation-Evaporation Concentration - Supercritical Water Gasification - Supercritical Water Oxidation for Coking Wastewater Treatment

2013 ◽  
Vol 763 ◽  
pp. 191-194 ◽  
Author(s):  
Yu Zhen Wang ◽  
Shu Zhong Wang ◽  
Yang Guo ◽  
Dong Hai Xu
Keyword(s):  
Wastewater Treatment ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Coking Wastewater ◽  
Supercritical Water Oxidation ◽  
Combined Process ◽  
Whole Process ◽  
Evaporation Concentration ◽  
Supercritical Water Gasification ◽  
Operation Cost

A combined process of ammonia distillation - evaporation concentration - supercritical water gasification (SCWG) supercritical water oxidation (SCWO) was proposed for coking wastewater treatment. The NH3 in wastewater was first recovered in ammonia distillation section. The deammoniated wastewater was concentrated in the evaporation concentration section, in which the quantity of the wastewater was decreased accordingly. Then the concentrated wastewater entered into the SCWG section to produce the syngas such as H2, CO, CH4, and liquid effluent entered into SCWO section, where the pollutants were completely degraded. The operation parameters of the combined process were simulated by Aspen Plus software and the investment and the operation cost were also analyzed. For a wastewater of 5000kg/h, the investment of the combined process is 6000000 ¥. The profit from byproduct of ammonia, syngas and steam is 70¥/t. For the whole process, it can gain a profit of 5.1 ¥/t (wastewater).

Application Present Status of Supercritical Water Oxidation Technology in Industrial Wastewater Treatment

2015 ◽  
Vol 737 ◽  
pp. 664-667 ◽  
Author(s):  
Hao Wang ◽  
Yan Ting Cui ◽  
Deng Ling Jiang
Keyword(s):  
Wastewater Treatment ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Industrial Wastewater ◽  
Fundamental Principle ◽  
Flow Sheet ◽  
Supercritical Water Oxidation ◽  
Industrial Wastewater Treatment ◽  
Existing Problems ◽  
Environmentally Safe

Supercritical Water Oxidation (SCWO) is a unique environmentally safe technology being widely used in industrial wastewater treatment for its remarkable superiority of removes organic matters efficiently. Characteristics of supercritical water, fundamental principle and flow sheet of SCWO were introduced. Meanwhile, application situations of SCWO in different fields of industrial wastewater treatment were presented in detail, the existing problems in its application were pointed out. At last the prospect for the development of SCWO was also proposed.

Treatment of high strength coking wastewater by supercritical water oxidation

Fuel ◽  
2013 ◽  
Vol 104 ◽  
pp. 77-82 ◽  
Author(s):  
Xin Du ◽  
Rong Zhang ◽  
Zhongxue Gan ◽  
Jicheng Bi
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
High Strength ◽  
Coking Wastewater ◽  
Supercritical Water Oxidation

Technical and Economic Analysis of Supercritical Water Oxidation and Biochemical Process for Lurgi Coal Gasification Wastewater Treatment

2013 ◽  
Vol 664 ◽  
pp. 265-269
Author(s):  
Yu Zhen Wang ◽  
Shu Zhong Wang ◽  
Yang Guo ◽  
Dong Hai Xu ◽  
Guang Xin Yu ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Coal Gasification ◽  
Flow Sheet ◽  
Supercritical Water Oxidation ◽  
Biochemical Process ◽  
Technical And Economic Analysis ◽  
Coal Gasification Wastewater ◽  
Operation Cost

The technical and economic analysis of supercritical water oxidation (SCWO) and biochemical process for Lurgi coal gasification wastewater (LCGW) treatment were carried out. The findings include the analysis of flow sheet, effluent quality and operation cost of the two processes. Studies show that the SCWO process is more simply and easier to control than the biochemical process. The effluent treated with SCWO process could reach national discharge standard I (GB 8978-1996) without other pretreatment and advanced processes, and could gain 2.3 yuan RMB/t(LCGW). While the operation cost of biochemical treatment is 41.8 yuan YMB/t(LCGW). The SCWO process shows a unique advantage in both technology and economy and will be a promising technique for LCGW treatment.

Supercritical Water Oxidation of Lurgi Coal Gasification Wastewater and Evaluation of the Combined Process with Gasification

2012 ◽  
Vol 610-613 ◽  
pp. 2203-2210 ◽  
Author(s):  
Yu Zhen Wang ◽  
Shu Zhong Wang ◽  
Yang Guo ◽  
Dong Hai Xu ◽  
Yan Meng Gong ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Coal Gasification ◽  
Batch Reactor ◽  
Supercritical Water Oxidation ◽  
Combined Process ◽  
Technical Feasibility ◽  
Volatile Phenol ◽  
Coal Gasification Wastewater ◽  
Oxygen Ratio

Degradation of Lurgi coal gasification wastewater in supercritical water was investigated in a batch reactor, and a combined process of supercritical water oxidation (SCWO) and gasification was put forward to utilize the material and energy in SCWO effluent. The technical feasibility and economy were evaluated. In the SCWO process, when operated at condition of 500 °C, 25 MPa, oxygen ratio of 3.5 and residence time of 15 min, the concentrations of COD, NH3-N and volatile phenol in effluent reduced to 27, 11 and 0.4 mg/L, respectively, where the removal efficiencies were 99.81%, 99.85% and 99.99%, accordingly. The effluent could reach national discharge standard I (GB 8978-1996), and can be used as the gasification agents of gasifier via a pressure reducer. For a single Lurgi gasifier, the combied process could save 23 t/h of steam and 1550 kg/h of O2, which is equal to 4996 yuan/h.

Process Simulation of Laboratory Wastewater Treatment via Supercritical Water Oxidation

2014 ◽  
Vol 53 (18) ◽  
pp. 7723-7729 ◽  
Author(s):  
Xiuqin Dong ◽  
Yaqi Wang ◽  
Xuqing Li ◽  
Yingzhe Yu ◽  
Minhua Zhang
Keyword(s):  
Wastewater Treatment ◽  
Supercritical Water ◽  
Process Simulation ◽  
Water Oxidation ◽  
Supercritical Water Oxidation
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