Diatomite-enhanced coagulation for algal removal in polluted raw water: performance optimization and pilot-scale study

Jiang, Chao; Ding, Wei; Zhu, Weitang; Zhu, Liang; Xu, Xiangyang

Diatomite-enhanced coagulation for algal removal in polluted raw water: performance optimization and pilot-scale study

2021

Jiang, Chao | Ding, Wei | Zhu, Weitang | Zhu, Liang | Xu, Xiangyang

Algae blooms have seriously threatened the health of aquatic ecosystems and the safety of drinking water. In this study, diatomite-enhanced coagulation technology was developed to improve the removal of algae and other pollutants. The dosage and ratio of diatomite and aluminum salts were optimized to 40mg/L and 1:1 which achieved algal removal efficiency of 98.8±0.65%. The effect of environmental factors was studied and it shows that cell density, pH, and temperature had a significant impact on algal removal. The mechanism of diatomite-enhanced coagulation was speculated to be adsorption bridging and sweep flocculation. Pilot-scale equipment was set up to verify the performance of diatomite-enhanced coagulation in engineering applications on algae polluted raw water. Results showed a better removal efficiency of algae, NH₄⁺-N, NO₂⁻-N, and CODMₙ and lower operation cost than the actual operation in the Waterwork Corporation were achieved with good application prospects and promotion value.

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