TREATMENT OF HIGH-SALINITY PHOSPHATE-CONTAINING WASTEWATER BY CHEMICAL PRECIPITATION METHOD

LI Qing-qing; YANG Yan; XI Huan; GUO Feng; ZHANG Jian-feng; RUAN Shi-ping

doi:10.13205/j.hjgc.202205005

Volume 40 Issue 5

Jul. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(5): 31-36

LI Qing-qing, YANG Yan, XI Huan, GUO Feng, ZHANG Jian-feng, RUAN Shi-ping. TREATMENT OF HIGH-SALINITY PHOSPHATE-CONTAINING WASTEWATER BY CHEMICAL PRECIPITATION METHOD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 31-36. doi: 10.13205/j.hjgc.202205005

Citation:

LI Qing-qing, YANG Yan, XI Huan, GUO Feng, ZHANG Jian-feng, RUAN Shi-ping. TREATMENT OF HIGH-SALINITY PHOSPHATE-CONTAINING WASTEWATER BY CHEMICAL PRECIPITATION METHOD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 31-36. doi: 10.13205/j.hjgc.202205005

Citation:

LI Qing-qing, YANG Yan, XI Huan, GUO Feng, ZHANG Jian-feng, RUAN Shi-ping. TREATMENT OF HIGH-SALINITY PHOSPHATE-CONTAINING WASTEWATER BY CHEMICAL PRECIPITATION METHOD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 31-36. doi: 10.13205/j.hjgc.202205005

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TREATMENT OF HIGH-SALINITY PHOSPHATE-CONTAINING WASTEWATER BY CHEMICAL PRECIPITATION METHOD

doi: 10.13205/j.hjgc.202205005

1. Institute of Mechanics and Materials, Hohai University, Nanjing 210098, China;
2. Nanjing Hydraulic Research Institute, Nanjing 210029, China;
3. Jiangsu Engineering Research Center on Utilization of Alternative Water Resources, Nanjing 210000, China

Received Date: 2021-04-12
Available Online: 2022-07-02

Abstract

Abstract

High-salinity phosphate-containing wastewater has the characteristics of high salt content, complex pollutant composition and is difficult to be treated by the biological method. The supernatant will contain some PO^3-₄-P after struvite production by adding excessive inducers and diluents such as Na₂HPO₄ and NH₄HCO₃ to seawater. A chemical precipitation method was applied for excessive phosphate removal. In our experiment, poly-aluminium chloride(PAC), FeCl₃, Ca(OH)₂ and polyacrylamide(PAM) were selected as experimental chemical reagents. The effect of reaction time, the additive amount of a single chemical reagent and a combination of chemical reagents on the phosphate removal effect were studied. Finally, two strategies were selected, which could make the phosphate content in the effluent meet the emission standard. Strategy 1:adding Ca(OH)₂ with a molar ratio of Ca:P of 4.5 made the PO^3-₄-P content decrease to 0.2 mg/L. Strategy 2:adding Ca(OH)₂ with a molar ratio of Ca:P of 4.0, PAC with a molar ratio of Al:P of 0.5, and PAM with a concentration of 0.5 g/L made PO^3-₄-P content decrease to 0.4 mg/L. Strategy 1 was easy to operate while strategy 2 was helpful for solid-liquid separation. Both of them can be used for the treatment of high-salinity phosphate-containing wastewater. The results provide a practical idea for the treatment of high-salinity phosphate-containing wastewater in the future.
- high-salinity phosphate-containing wastewater,
- chemical precipitation method,
- iron aluminum calcium salt,
- flocculant,
- compound

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References(24)

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