Lutai Chemical achieves zero discharge of wastewater and promotes high-quality green development

In recent years, Lu Thai Chemical has continuously expanded its production capacity, enhanced the added value of its products, developed a circular economy, and has developed rapidly in the national chlor-alkali industry.
As an advanced group in the prevention and control of water pollution in the Huaihe River Basin, Lutai Chemical has accelerated the promotion of pollution control and resource recycling, continuously adapted to the new requirements of advancing with the times, and continued to seek breakthroughs and innovative development.
??? Calculated based on the company's current production capacity, under normal production conditions, Lu Thai Chemical consumes approximately 3.
5 million tons of water per year and approximately 2.
3 million tons of sewage discharge per year.
With the implementation of a series of measures to promote production and improve efficiency, such as production expansion, process transformation, project construction, and maintenance, water consumption and wastewater discharge will become shortcomings that restrict the company's green development.
Based on the concept of green development, Zhang Yubiao, Secretary of the Party Committee and Chairman of Luthai Chemical, took the "three wastes" as the starting point and the goal of governance as the goal, and took the lead in proposing "zero waste water discharge, no air pollution, and solid waste reuse".
The word environmental protection policy is committed to the utilization of waste water resources, comprehensive treatment of exhaust gas, and legal disposal and utilization of solid waste.
The disadvantages are turned into advantages, the shortcomings are turned into springboards, and green is used to lay a solid foundation for high-quality development and build a first-class Modern chemical enterprise.
? The horn has been sounded, and the execution is time.
Lu Thai Chemical’s leadership team immediately convened an on-site meeting to build a zero-discharge wastewater organization framework, formulate work plans and measures, determined to set the goal and not relax, lay down to implement it, vigorously develop the zero-discharge project of wastewater, and completely solve the use of water resources and zero wastewater.
Emission issues.
??? Luthai Chemical implements full-process control in three aspects: prevention and control at the source, process governance, and end disposal in accordance with the principle of prevention first, combination of prevention and control, and comprehensive management, to achieve zero discharge of wastewater.
Through the establishment of a diversion system based on rain and sewage diversion and clean sewage diversion, the whole process of wastewater generation, collection, transportation, and disposal is optimized and upgraded, and new technical means of equipment renewal, process optimization, platform construction, and monitoring and upgrading are used.
The production and discharge identification, water circulation operation, discharge risk monitoring and emergency treatment of discharge are carried out structural adjustments.
Wastewater recycling is carried out on the three levels of cascade reuse, recycling and regeneration of wastewater, seeking the best matching of different water quality and different processes.
Realize the goal of minimizing the total amount of waste water and maximizing the efficiency of water resource utilization, and finally realize zero discharge of waste water.
At present, Lu Thai Chemical's zero discharge of wastewater has been at the leading level in the domestic industry, providing a pioneering demonstration role for the industry's pollution control direction.
Grasping "source prevention and control" to achieve waste water emission reduction??? To focus on reducing the amount of waste water at the source, Lu Thai Chemical Learn to carry out Six Sigma lean management, analyze the status quo, process capabilities, screen key factors, formulate improvement plans and standardized control through five stages of definition, goal, analysis, improvement and control, and improve wastewater discharge defects.
??? One is the reduction of steam condensate water: Lutai Chemical has streamlined the number of steam traps, reasonably set up, updated the old ones, and connected them in close proximity, which greatly reduced the amount of condensate water discharged.
At the same time, lay water collection pipes in the production area to collect the condensed water and reuse it nearby.
After a series of optimizations of steam traps, more than 80 traps were updated, more than 20 traps were reduced, more than 10 connected in series, and steam condensate was reduced by 200m3/d.
??? The second aspect of circulating water pollution: Lutai Chemical carefully sorts out the circulating water pollution process, optimizes the sewage process, strictly controls various indicators, improves the circulating water quality, and reduces the circulating water pollution.
Specifically, by extending the filtering time, regularly cleaning the filter material, controlling the frequency of dosing, improving the quality of fresh water replenishment, and improving the quality of circulating water.
Add online monitoring equipment to the circulating water pool, improve the circulating water monitoring environment, monitor the quality of circulating water in real time, ensure the accuracy of circulating water quality monitoring, and optimize the automatic sewage discharge technology of circulating water.
After multiple measures, the various indicators of circulating water quality are relatively stable, and the frequency of discharge and water volume have been greatly reduced.
??? The third aspect is the mechanical seal cooling water: Lutai Chemical extracts 100 large and small pumps on site for statistics on the mechanical seal water flow, and there is widespread waste.
Add a flow meter at the source of mechanically sealed water, reasonably control the flow of mechanically sealed water, and increase the mechanically sealed water collection pipeline for reclaimed water reuse.
??? The fourth aspect of equipment maintenance and pollution discharge: before the maintenance operation of Lutai Chemical equipment, prepare environmental protection preventive measures, including the source of waste liquid, water volume, water quality, and formulate collection, diversion, emergency measures and the feasibility of measures to ensure the operation process The waste liquid is collected effectively.
During the operation, the on-site maintenance guardian implemented the environmental protection measures and found that the measures were not implemented, and immediately blocked the operation process, and the operation could not be performed until the measures were improved.
Grasp "process governance" to achieve comprehensive governance??? ? In order to achieve zero discharge of wastewater, the entire process of wastewater generation from collection, storage, transportation, and disposal should be optimized.
Comprehensive treatment should be carried out directly in the water production area, and the reuse of reclaimed water should be increased to prevent direct discharge into the external environment.
Lu Thai Chemical uses intelligent information systems and automated operation management to count and summarize all waste water discharge points in the production area, collect domestic sewage and production waste water by quality, build waste water collection ponds, lay waste water transportation pipe networks, and separate Such waste water is sent to different places through their respective waste water pipelines.
Waste water enters domestic sewage and industrial waste water treatment facilities through respective pipe networks, realizing the whole pipeline transportation of sewage.
Use the original trench to lay tiles on the upper layer to separate the production area to form a closed environment.
Reasonably set up rainwater diversion openings in the workshop to build a rainwater flow system.
In the rainwater drainage system, automatic switching gate valves are installed in the production plant area, tank area, sewage treatment and other places, and all the initial rainwater generated during rainfall is transported to the industrial wastewater treatment facility for treatment, and the later rainwater is directly discharged from the plant area through the rainwater pipe network.
??? In the production of polyvinyl chloride, a large amount of waste water is generated during the production process, including polymerization centrifuge mother liquor water, waste acetylene waste sodium waste water, and vinyl chloride waste water containing mercury.
These wastewaters have the characteristics of high pollutant content, large water volume, and hard-to-degrade characteristics.
In response to these waste water, Lu Thai Chemical proposed to build a waste water treatment device during the production process in the water production area, and the water produced after treatment can be reused according to the quality.
??? In view of the nature of the waste water produced in the PVC process, Lutai Chemical invested 26.
5 million yuan to build a 3600m3/d polymerization centrifugal mother liquor wastewater treatment device, using the current advanced treatment technology to treat the PVC mother liquor wastewater generated in the polymerization drying process.
deal with.
The device includes a polymer centrifugal mother liquor wastewater biochemical treatment device and a reclaimed water advanced treatment device.
After the device is operated, the water production rate reaches more than 90%, and the pollutant removal rate reaches more than 95%.
The effluent quality of the reclaimed water advanced treatment device reaches the desalinated water standard, and the conductivity is ≤2us/cm, It can be used as water for polymerization reaction or replenishing water for refrigerating cycle drying tower, realizing zero discharge of mother liquor wastewater.
In the acetylene production process, sodium hypochlorite is used to clean the acetylene gas.
After cleaning, the temperature of the waste sodium water reaches 70°C, and the water contains pollutants such as acetylene, sulfide and phosphide.
Lutai Chemical invested 7.
6 million yuan to build a 100m3/h waste secondary sodium water comprehensive utilization project.
Using the most advanced technology and equipment, the waste secondary sodium water was collected and treated by a comprehensive utilization device, and 85% of the water was used for fresh secondary sodium.
Recycling and safe sodium preparation, 15% of the water volume meets the three types of water quality indicators, and is used for salt or acetylene generation water in the brine process to realize the comprehensive treatment and recycling of waste inferior sodium water.
??? Mercury catalyst is used as a catalyst in the production of vinyl chloride.
After vinyl chloride is converted, it will produce mercury-containing wastewater through acid washing, alkali washing, and compression.
Direct discharge or utilization will seriously pollute the external environment such as water bodies and soil.
Lu Thai Chemical puts mercury pollution prevention and control as the focus of its work.
It invested 4.
2 million yuan to build PVC mercury pollutant emission reduction treatment facilities, and selected advanced treatment devices.
After treatment, the mercury concentration in the wastewater is ≤1ug/L to achieve zero discharge of mercury-containing wastewater.
Grasping "end disposal" to achieve zero discharge of wastewater??? By implementing various measures for prevention and control at the source and process governance, a large amount of wastewater has been disposed of and reused, and the rest of the water has to pass through the pipeline to enter the end for final disposal.
The main sewage treatment facility at the Lutai Chemical Terminal is the water purification center.
The original design was that the chemical waste water and domestic sewage were treated separately and then discharged through a homogeneous mixing tank.
The chemical waste water was treated with a "neutralization + flocculation" sedimentation treatment process, but the treatment effect was not ideal.
According to the actual situation of sewage influent water quality, Lutai Chemical makes full use of the existing sewage treatment facilities to optimize the sewage treatment process, and after the biochemical chemical wastewater is treated by the chemical wastewater treatment facility, it is piped to the domestic sewage treatment facility for processing.
Reprocessing, thereby prolonging the sewage treatment time and improving the efficiency of sewage treatment.
At the same time, it invested 15 million yuan to transform domestic sewage treatment facilities and implement reclaimed water reuse projects.
After the device is put into operation, the sewage treatment capacity is greatly improved, the pollutant removal rate is more than 95%, and the water production rate is more than 90%.
The effluent water quality can reach the quality of fire water, which can be directly used as fire water replenishment and greening water, finally achieving zero discharge of wastewater.
??? Through the implementation of the zero-discharge wastewater project, all the water produced by the mother liquor wastewater treatment plant is reused in the polymerization and freezing production plant, which can reduce the annual waste water discharge by 1.
01 million tons, save the groundwater 1.
01 million tons, and reduce the environmental protection tax by 220,000 yuan.
Save water tax 454.
50,000 yuan.
The water quality of the waste sodium comprehensive utilization project is fully recycled, which can reduce 820,000 tons of wastewater discharge every year, save 697,000 tons of groundwater, reduce environmental protection taxes by 170,000 yuan, and save water resources taxes by 3.
136 million yuan.
After the advanced treatment of mercury-containing wastewater, all the water produced is reused, which can reduce the discharge of wastewater by 26,000 tons per year.
About 450,000 tons of clean water is collected every year for reuse of reclaimed water, which can save water resources tax costs of 2,025,000 yuan.
In summary, the zero-discharge wastewater project reduces wastewater discharge by approximately 2.
306 million tons per year, reduces environmental protection tax by 350,000 yuan, saves water resource tax by 10.
377 million yuan, and saves 10.
727 million yuan in total.
??? In recent years, under the leadership of the party building brand of "Five Rong, Five Excellent, Red Engine, Green Sharing", Lu Thai Chemical has adhered to the company's "15-character environmental protection policy" unswervingly, and vigorously promoted the implementation of the "zero waste water discharge" project.
As a state-owned enterprise, it has fulfilled its social responsibilities, and formed the company's characteristic culture of zero discharge of wastewater in the field of ecological and environmental protection.
With the help of source prevention and control, process governance, and end disposal smart management and control, the company effectively solved the practical problems of high energy consumption of water resources and high pollution of wastewater, reached the leading level in the domestic industry, and established an industry that can be replicated, used for reference, and optimized.
The zero discharge model of wastewater has a certain promotion value and brand cultural value.
(Contributed by Song Dongmei) 70 thousand yuan.
??? In recent years, under the leadership of the party building brand of "Five Rong, Five Excellent, Red Engine, Green Sharing", Lu Thai Chemical has adhered to the company's "15-character environmental protection policy" unswervingly, and vigorously promoted the implementation of the "zero waste water discharge" project.
As a state-owned enterprise, it has fulfilled its social responsibilities, and formed the company's characteristic culture of zero discharge of wastewater in the field of ecological and environmental protection.
With the help of source prevention and control, process governance, and end disposal smart management and control, the company effectively solved the practical problems of high energy consumption of water resources and high pollution of wastewater, reached the leading level in the domestic industry, and established an industry that can be replicated, used for reference, and optimized.
The zero discharge model of wastewater has a certain promotion value and brand cultural value.
(Contributed by Song Dongmei) 70 thousand yuan.
??? In recent years, under the leadership of the party building brand of "Five Rong, Five Excellent, Red Engine, Green Sharing", Lu Thai Chemical has adhered to the company's "15-character environmental protection policy" unswervingly, and vigorously promoted the implementation of the "zero waste water discharge" project.
As a state-owned enterprise, it has fulfilled its social responsibilities, and formed the company's characteristic culture of zero discharge of wastewater in the field of ecological and environmental protection.
With the help of source prevention and control, process governance, and end disposal smart management and control, the company effectively solved the practical problems of high energy consumption of water resources and high pollution of wastewater, reached the leading level in the domestic industry, and established an industry that can be replicated, used for reference, and optimized.
The zero discharge model of wastewater has a certain promotion value and brand cultural value.
(Contributed by Song Dongmei)