Valorization of citric acid production wastewater as alternative carbon source for biological nutrients removal: A pilot-scale case study

Abstract A pilot-scale process for valorization of citric acid production wastewater as alternative carbon source was developed. Calcium oxide and polyaluminum chloride were used to precipitate phosphate and suspended solids. Concentrated liquor with high concentration organic matter was obtained through filtration and concentration processes, and could be used as an alternative carbon source for biological nutrients removal. The performance of alternative carbon source for biological nutrients removal was close to traditional external carbon source (e.g., sodium acetate). The carbon source utilization efficiency was observed as 5.41 and 4.92 mg chemical oxygen demand equivalent of alternative carbon source and sodium acetate, respectively, to remove per mg total nitrogen. The process for valorization of citric acid production wastewater as alternative carbon source was profitable (4.6 USD/m3) based on economic analysis. In summary, the process could relieve wastewater pollution issue while the product served as an efficient carbon source in biological treatment process of wastewater.

• Publication year

  2020

• Venue

  Journal of Cleaner Production

• Publication date

  2020-06-01

• Fields of study

  Chemistry, Environmental Science

• Identifiers
  DOI 10.1016/j.jclepro.2020.120576
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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