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The wastewater of pulverized coal pressurized gasification is mainly organic wastewater produced in the process of gas washing, cooling and purification. The wastewater contains a lot of phenols, nitrogenous aromatic hydrocarbons and other heterocyclic organic pollutants. In industrial production, the combined process of phenol ammonia recovery and biochemical treatment is used to treat coal gasification wastewater, which not only recovers useful substances in wastewater but also reduces the subsequent treatment load. The total organic carbon in phenolamine recovery wastewater can be determined and treated by UV catalytic oxidation method.