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Struvite crystallization method is used to effectively remove high concentration of ammonia nitrogen from leachate during the pretreatment stage of industrial solid waste landfill (ISWL) leachate. The effects of molar ratio of phosphorus to nitrogen (P:N), molar ratio of magnesium to nitrogen (Mg:N) and pH value on ammonia nitrogen removal were discussed. The results indicate that compared with pH adjustment later, pH adjustment first increases the removal rate of ammonia nitrogen by 30–54% . When pH value is 9.5, the removal of ammonia nitrogen reaches 82%; When P:N is 0.9 ∼ 1.1, the removal of ammonia nitrogen is maintained at 78 ∼ 82%; When Mg: N is 1.1 ∼ 1.3, the removal of ammonia nitrogen reaches 90%; When the pH value is 10 and P:N:Mg is 1.1:1:1.2, the removal rate of ammonia nitrogen reaches the highest, reaching 95.9%.

Pretreatment of ammonia nitrogen in industrial waste leachate by struvite crystallization method