Abstract
This study was conducted to investigate a novel treatment method for coal gasification wastewater (CGWW) by combining magnesium ammonium phosphate (MAP) precipitation and photocatalysis processes. The optimized conditions for MAP process were explored, and the removal efficiency of NH4-N by the MAP treatment can exceed 85% at the mole ratio of 1.2~1.4 MgCl2 and 0.9 Na2HPO4 to NH4+ as precipitators, and the pH value at 9.0~9.5. The MAP precipitates are an useful slow-available-fertilizer. After the photocatalysis treatment of 5hrs, the total removal efficiency for NH4-N, COD, Phenol and CN− exceeds 99%, 95%,90% and 90%,respectively.This technology with low cost and high efficiency has big potential to treat CGWW practically on a large scale.
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