Lanzhou Petrochemical Auxiliary Factory Actively Explores the Treatment Method of High Concentration Organic Wastewater. Through One Year's Research and Practice, It Innovatively Completes the Recycling and Utilization of High Concentration Organic Wastewater in Methyl Ethyl Ketone Plant, Which Is the First Time in the Domestic Methyl Ethyl Ketone Industry. Through Waste Water Reuse, The Annual Cost Can Be Reduced by About 4.18 Million Yuan, Achieve a Win-Win Situation of Pollutant Reduction and Cost Control, And Realize Pollution Control and Cost Reduction.
Waste Water Becomes an Eyesore
The High Concentration Organic Wastewater of Methyl Ethyl Ketone Plant Is the Industrial Wastewater Produced by the Secondary Butanol Refining Unit of the Plant. The Composition Is Complex, Containing Secondary Butanol, Sec-Butyl Ether, Tert-Butanol, Methyl Ethyl Ketone and Other Organic Matter, Which Is Harmful to the Ecological Environment. Before the Implementation of Back Refining, Waste Water Should Be Disposed of in the Way of External Transport. With the Upgrading of Environmental Protection Supervision, The Sewage Disposal Fee Has Increased Significantly, Which Increases the Production Cost and Has Potential Environmental Protection Risks. Therefore, It Is Necessary to Carry out a "Green Revolution" On This Waste Water.
In March 2014, The Analysis of Cost Activities in This Factory Gave the Answer. The Two Sets of Methyl Ethyl Ketone Plants Produce About 6000 Tons of Organic Wastewater Every Year, And the Transportation and Disposal Cost of Each Ton of Wastewater Is 204 Yuan, Resulting in a Total Disposal Cost of About 1.22 Million Yuan. The Contents of Secondary Butanol, Tertiary Butanol and Methyl Ethyl Ketone in Organic Wastewater Reach 0.89%, 1.26% and 5.24%, Respectively. The Three Kinds of Materials Are Recycled, And the Annual Cost Is 2.96 Million Yuan. The Two Costs Total 4.18 Million Yuan.
Return to Form a "New Channel"
The Auxiliary Factory Set up a Research Team to Go to Harbin Petrochemical and Fushun Petrochemical to "Learn From" The Advanced Experience of High Concentration Organic Sewage Treatment. The Research Team Carried out Several Industrial Tests to Determine the Feasibility of Wastewater Recycling Process. The Original Process of the Plant Cannot Lead the Wastewater Back to the Secondary Butanol Refining Unit, So a New Way Must Be Found. In Order to Determine the Best Back Refining Process, The Auxiliary Factory Takes Advantage of the Equipment Maintenance Opportunity to Add a New Process from Wastewater Tank to Secondary Butanol Refining Unit to Open up the Wastewater Back Refining Channel; After the Waste Water Is LED to the Refining Unit, Three Parallel Back Refining Schemes Are Developed and Implemented, One by One Comparative Analysis, Continuous Improvement Operation, Through the Refining Unit Secondary Butanol Tower and Heavy Material Tower Function Conversion, Function Release and Other Optimization Adjustment, The Refining Unit Has Achieved Multiple Systems, Multiple Processes, Multiple Functions Overall Consideration, And Initially Achieved the Design Goal of Waste Water Back Refining.
Environmental Protection Production "All Win"
With the Wastewater Recycling System Put into Operation, The Production Operation of Secondary Butanol Refining Unit of Methyl Ethyl Ketone Unit Has Been Impacted to a Certain Extent. The Proportion of Each Component Fluctuates Due to the Change of Wastewater Concentration. The Post Operators Have Insufficient Understanding of the Change of Process Conditions, Resulting in the Process Index of Refining Unit Exceeding the Standard and the Quality of By-Products Declining. It Is Urgent to Solve the Parallel Operation of the Back Refining System and the Original Production System.
The Auxiliary Plant Focuses on the Key Point of Return Refining System -- The Temperature of Azeotrope Tower Reactor, Strengthens the Quality Inspection Analysis of Waste Water Tank, Carefully Observes the Stratification of Water and Oil Phase, And Dynamically Adjusts the Temperature of Tower Reactor According to the Specific Process Conditions of Return Refining Waste Water to Ensure the Effect of Waste Water Return Refining. On the Other Hand, The Stable Operation of Sec-Butyl Ether Distillation Tower, The Key Point of the Production System of the Refining Unit, The Exclusive Division of the Two Feed Intermediate Tanks of This Unit, One of the Intermediate Tanks Is Changed into the Waste Water Circulation Tank of the Back Refining System, And the Crude Secondary Butanol and Waste Water Are Sent into the Production System in a Controllable Proportion to Ensure the Ternary Azeotrope Operation of the Production System. It Realizes the Purpose of Using Waste Water to Replace Part of Desalted Water and Recycling Effective Components in Waste Water. Pollution Control and Root Cure Resonate Here.
After Nearly a Year of Operation, The Running Condition of the Wastewater Recycling Sys