Research on water pollution control technology assessment in zinc smelting industry based on AHP-FCE

The evaluation index system of water pollution control technology of zinc smelting industry was constructed, the analytic hierarchy process-fuzzy comprehensive evaluation (AHP-FCE) model was developed, and the evaluation standards of water pollution control technology of zinc smelting industry were established in two technical units: the complete set of pollution control technology for waste acid and acid wastewater and the complete set of comprehensive wastewater treatment and reuse technology. Then the comprehensive quantitative evaluation of eight pollution control technologies in two technical units was carried out based on AHP-FCE. The results showed that: The comprehensive evaluation score of the key technology of waste acid resource treatment based on “selective adsorption-gas-liquid enhanced sulphidation-evaporation concentration-fluorine chlorine separation” was 4.38, which was the best of the four waste acid and acid wastewater pollution control technologies; the comprehensive evaluation score of the heavy metal smelting wastewater biophysical and chemical combination treatment and reuse technology based on “biological agent advanced treatment technology of heavy metal wastewater” was 4.14, which was the best of the four comprehensive wastewater treatment technologies. The evaluation results couldprovide a reliable basis for enterprises to choose suitable water pollution control technology, and also provide a strong support for the management department to recommend the best feasible technology and formulate relevant policies and standards.