An integrated process of chemical precipitation and sulfate reduction for treatment of flue gas desulphurization wastewater from coal-fired power plant

Yan, Jia; Yuan, Wenhuan; Liu, Jian; Ye, Weizhuo; Lin, Jinlan; Xie, Jiahao; Huang, Xuan; Gao, Shanshan; Xie, Jiehui; Liu, Shinian; Wen-zhong, Chen; Zhang, Hongguo

doi:10.1016/j.jclepro.2019.04.227

Cited by 63 publications

(13 citation statements)

References 41 publications

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“…In recent years, many novel DW treatment methods, such as evaporation crystallization, , Friedel’s salt precipitation, electrolysis/electrocoagulation, , biosorption, and membrane filtration, − have been developed for Cl – removal and recirculation of DW. Among these treatment methods, DW evaporation using hot flue gas is the most promising technique for reducing the cost of treatment and has become the focus of current research on DW treatment.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

et al. 2020

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Desulfurization wastewater (DW) can be effectively treated via evaporation using hot flue gas with zero DW discharge. In this study, the characteristics of HCl release and SO 2 /NO 2 absorption were investigated during DW evaporation based on an experimental spray drying system. The results indicated that increasing the pH of DW effectively inhibited HCl release by inhibiting the acidification of water and hydrolysis of chloride. At high pH, regardless of changes in operational parameters, the HCl release ratio remained less than 4.0%. Additionally, DW with high pH also absorbed SO 2 and NO 2 during evaporation, and its SO 2 absorption efficiency was greater than its NO x absorption efficiency. The main parameters inhibiting HCl release ratio, i.e., higher pH, higher Cl − concentration in DW, and lower flue gas temperatures, also promoted SO 2 /NO 2 absorption. However, by adding excess Ca(OH) 2 to DW, the absorption of the acidic pollutants did not increase the release of HCl during DW evaporation. Under the operational parameters of the reference experiment, the absorption efficiencies of SO 2 and NO x were 35.6% and 16.2%, respectively, and the corresponding HCl release ratio was approximately only 1.1%.

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Section: Introductionmentioning

confidence: 99%

Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

et al. 2020

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“…Electrooxidation had attracted great attention as its advantages of no chemical addition, high efficiency, and easy operation (Barrios, Becerril, De León, Barrera‐Díaz, & Jiménez, 2015), especially for the industrial wastewater with high salinity. The electrooxidation for ammonia has been widely applied in the treatment for a diversity of wastewater, such as landfill leachate (Deng, Chen, Feng, Chen, et al, 2019; Fernandes, Santos, Pacheco, Ciríaco, & Lopes, 2016), power plant wastewater (Yan et al., 2019), aquaculture wastewater (Huang, Zhang, et al, 2016), and toilet wastewater (Huang, Qu, et al, 2016). Most ammonia in wastewater was electrooxidized to nitrogen by indirect oxidation process, which is similar but different with the breakpoint chlorination reaction, as shown in Equations ()–() (Zhang, He, Ma, & Waite, 2018; Zhang, Li, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation and prediction of electrooxidation removal of ammonia and its application in industrial wastewater effluent

Ding

Gao

Wang

et al. 2020

Water Environment Research

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A FLUENT software able to predict and assess the electrooxidation of ammonia from the simulation of ammonia concentration and flow field distribution was developed in this study. The flow field-based models of ammonia removal were simulated and modified through the experimental results. The parameter of reaction constant k is corrected to 0.00195, and the modified model fitted well with experimental values, with the error less than 4%. The electrode depth of 4 cm was assessed to be optimal for ammonia removal based on the comparison of the simulation results on ammonia concentration and flow field distribution. The prediction result applied in the industrial wastewater treatment indicated that complete could be achieved at 0.27 Ah/L, and about 50% of total nitrogen was removed at 0.8 Ah/L. About 7% of chloride ions were converted into inorganic by-products, indicating low biological toxicity and risk on environment. The energy consumption increased with the promotion of removal efficiency of total nitrogen, requiring 5.4 kWh/m 3 to remove 50% total nitrogen at 0.8 Ah/L. The results show the practicability and feasibility of this FLUENT software tool on the simulation and prediction of electrooxidation process, which can provide the simulation parameter settings for the subsequent application. © 2020 Water Environment Federation • Practitioner points • A FLUENT software based on the simulation of ammonia concentration and flow field distribution was able to predict and assess ammonia electrooxidation. • A modified model is provided with a rate constant k of 0.00195 and the distinction of 4% with experimental results. • The optimal electrode depth was predicted to be 4 cm via the obtained model. • Complete ammonia and about 50% of total nitrogen could be at 0.27 Ah/L and 0.8 Ah/L, receptively. • About 7% of chloride ions were converted into inorganic by-products in industrial wastewater with high chloride.

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“…In the current technology for treating desulfurization wastewater, the flue evaporation method has the advantages of the simple system and small secondary pollution [6][7][8]. The method is that the desulfurization wastewater after the primary sedimentation treatment is sent to the flue between the electric precipitator and the air preheater for atomization, and the residual heat of the flue gas absorbed by the wastewater is quickly evaporated into steam, and enters the condensation tower for condensation recovery.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Main Influencing Factors of the Wastewater Evaporation in Flue Duct

Zhang¹,

Wei²,

Gao³

et al. 2020

E3S Web Conf.

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Desulfurization wastewater has the characteristics of small discharge and high pollution, and must be strictly treated. To obtain the main factors affecting the evaporation characteristics of desulfurization wastewater in boiler flue, a 600MW unit of a coal-fired power plant in China was taken as an example. According to the theory of fluid mechanics and heat transfer, the numerical simulation method was used. The results show that the way the nozzle is installed on the upper wall of the flue inlet can enhance the evaporation effect of the desulfurization wastewater. It is also revealed that the influence of the flue gas flow rate on the droplet evaporation effect is relatively small. The smaller droplet diameter and the higher flue gas inlet temperature will obviously enhance the evaporation effect of the droplets in the flue. However these two factors will increase the operating cost and reduce the boiler thermal efficiency. Therefore, the values of the droplet diameter and the flue gas inlet temperature need to be further determined by technical and economic comparison.

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An integrated process of chemical precipitation and sulfate reduction for treatment of flue gas desulphurization wastewater from coal-fired power plant

Cited by 63 publications

References 41 publications

Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

Simulation and prediction of electrooxidation removal of ammonia and its application in industrial wastewater effluent

Analysis of Main Influencing Factors of the Wastewater Evaporation in Flue Duct

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An integrated process of chemical precipitation and sulfate reduction for treatment of flue gas desulphurization wastewater from coal-fired power plant

Cited by 63 publications

References 41 publications

Characteristics of HCl Release and SO2/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

Characteristics of HCl Release and SO2/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

Simulation and prediction of electrooxidation removal of ammonia and its application in industrial wastewater effluent

Analysis of Main Influencing Factors of the Wastewater Evaporation in Flue Duct

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Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas

Characteristics of HCl Release and SO₂/NOx Absorption in Desulfurization Wastewater Evaporation Using Hot Flue Gas