The produced water of coal-measure gas field in Linxing block, eastern margin of Ordos basin was characterized by high salt content, high hardness, and high turbidity. After experiment and engineering demonstration, the scheme of "pretreatment-reverse osmosis-MVR" was proposed to make the treated water meet standards for irrigation water quality. The pretreatment process of "hardness removal-flocculation-filtration-ultrafiltration" was simulated to explore the optimal process conditions for hardness and turbidity removal. The results showed that the hardness removal effect of Na2CO3 was better than that of NaOH. When the dosage of Na2CO3 was 15000mg·L-1, the maximum hardness removal rate was 99.39%. The mathematical model established by response surface methodology with turbidity removal rate as response value was very significant (P<0.0001). The optimal process conditions were pH 8.85, PAC dosage 148.34mg·L-1, PAM dosage 6.51mg·L-1. Under these conditions, the predicted turbidity removal rate was 83.32%, the actual turbidity removal rate was 82.77%, indicating a high degree of fitting between the actual and predicted values. The optimization of pretreatment process parameters is conducive to the fine control of the project, so as to reduce the cost and provide a guarantee for the subsequent reverse osmosis desalination treatment.
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