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Evaporation and concentration of desulfurization wastewater with waste heat from coal-fired power plants

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Abstract

The reduction of wet desulfurization wastewater is one of the important tasks of coal-fired power plants, and it is important for achieving “zero emissions.” Evaporation and concentration (E&C) with waste heat is an effective way to reduce wastewater. Here, two typical types of industrial desulfurization wastewater are used to study the change rule of pH and total dissolved solids during wastewater concentration in a circulating evaporation tower. The results indicate that with the increase of concentration ratio, the pH of desulfurization wastewater is decreased rapidly and then is gradually stabilized at 2–3 when SO2 or SO3 is contained in flue gas, and the increase in conductivity is less for wastewater with higher SO42− content. The characteristics of various ions are also analyzed, and the composition and microscopic morphology of the precipitates are characterized during concentration. The growth pattern of Ca2+ concentration is dependent on the ratio of Ca2+ and SO42− in raw wastewater. When the concentration ratio is 7.21, the insoluble and slightly soluble substances undergo precipitation and the solid content is approximately 20%, which can help realize the concentration and reduction of desulfurization wastewater.

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Funding

This work was financially supported by the National Natural Science Foundation of China (No. U1609212, 51621005)

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, National Environmental Protection Coal-fired Air Pollution Control Engineering Technology Center, Zhejiang University, Hangzhou, 310027, China

    Hao Zheng, Chenghang Zheng, Xiang Li, Shaojun Liu, Youngxin Zhang, Weiguo Weng & Xiang Gao

  2. Zhongyou Ruisi Technology Development Co., Ltd, Tianjin, China

    Shiguo Xu

Authors
  1. Hao Zheng
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  2. Chenghang Zheng
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  3. Xiang Li
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  4. Shiguo Xu
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  5. Shaojun Liu
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  6. Youngxin Zhang
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  7. Weiguo Weng
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  8. Xiang Gao
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Correspondence to Chenghang Zheng.

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Responsible editor: Bingcai Pan

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Zheng, H., Zheng, C., Li, X. et al. Evaporation and concentration of desulfurization wastewater with waste heat from coal-fired power plants. Environ Sci Pollut Res 26, 27494–27504 (2019). https://doi.org/10.1007/s11356-019-05297-6

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  • DOI: https://doi.org/10.1007/s11356-019-05297-6

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