Optimization of micro-channel coupled reverse osmosis membrane series treatment of methanol to olefin wastewater
According to the characteristics of the methanol to olefins(MTO)process,about 56％(wt)of the reaction products are water,which is an important link in the water balance of the entire plant and the main source of the sewage treatment unit.At present,the water produced by domestic MTO units is discharged to the sewage treatment unit for treatment.If this part of water can be recycled and reused,it can greatly reduce the water consumption per unit product of coal chemical industry.The traditional single separation technology cannot meet the synergistic removal of inorganic catalyst particles and reaction by-products in water.With the increasing demand for environmental protection,multi physics separation technology is increasingly being applied in the wastewater treatment.This work was based on on-site experiments and proposed a microchannel coupled reverse osmosis membrane series treatment process for methanol to olefin wastewater,achieving deep treatment and reuse of the wastewater.Long term experiments showed that the average turbidity of MTO purified water samples after treatment decreased from 24.55NTU to 0.57NTU,and the average COD decreased from the imported 521mg/L to 58.7mg/L.The separation and purification effect was significant.After using a series process to treat the purified water discharged by MTO,a single MTO unit was expected to reduce wastewater emissions by 1.115 million tons per year,save energy consumption of 1.79 × 105kW·h,and save production costs of 17.064 million yuan.This process had the characteristics of low investment,low energy consumption,high treatment efficiency,easy operation,reversible regeneration of adsorption medium and membrane,and stable operation.It effectively solved the problems of difficult reuse and discharge of purified water in methanol to olefin process,and was of great significance for improving water resources and achieving green chemical industry.
micro-channel separationreverse osmosis membrane separationmethanol to olefins wastewaterprocess optimizationfield experiment
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