Industrial Waste Water Treatment Technology

Membrane + MVR High-salt Zero Discharge Treatment Technology

Desulfurization wastewater mainly comes from gypsum dehydration and cleaning system of desulfurization system. The suspended solids in the wastewater are very high, which can be up to tens of thousands of mg/L. Fluoride, COD and heavy metals exceed the standard with high content of salt, calcium and magnesium ions, chloride ions, sulfate ions, and sulfite ions, etc. Due to the influence of coal classification, water quality of desulfurization Island, discharge cycle and other factors, the water quality is very different and corrosive.

Process flow chart of desulfurization wastewater treatment

Based on the company's technology and experience in the field of membrane process, Greenism takes the TUF, NF, RO, DTRO membrane process as the technical core, and uses the whole membrane process to complete the zero-discharge treatment design of desulfurization wastewater.

Field diagram of evaporator for zero-discharge treatment of high salt wastewater

The technology has the following characteristics:

        1.The investment cost is less than that of flue gas waste heat treatment method;

        2.The freight cost is about 1/3 of that of flue gas waste heat method;

        3.High technology maturity, the technology used is mature in the industry, to ensure the stable operation of the main system;

        4.High degree of automation and unattended operation;

        5.Significant economic benefits, the resource utilization of NaCl and Na2SO can be realized by nanofiltration salt separation.

Comprehensive Treatment and Reuse Technology of Underground Mine Wastewater by Full Membrane Process

The original occurrence state of groundwater is destroyed by mining, and the settlement and cracks are caused by backfilling. The sewage in the mining process infiltrates into the underground mining space along the original and new cracks to form mine slime water. Mine slime water is the main discharged waste water in the process of coal production. It contains a lot of slime, floating oil and fine pulverized coal. According to different geological conditions, there are different degrees of hardness, iron, fluorine and other excessive substances, which can not be directly used. If discharged, it will seriously damage the surrounding environment.

Example of mine water treatment project

Due to the limitation of technology and lack of understanding, mine slime water is treated as a water disaster to prevent and control, mine slime water is discharged without comprehensive utilization and protection. According to statistics, about 2 tons of mine slime water is discharged for each ton of raw coal mining, and the decline of surface water also causes a serious shortage of water.

Underground sewage treatment unit

Through the field investigation of a large number of coal mines, the expert team of Greenism analyzed, tested and treated various types of mine wastewater, overcame the particularity of the design and operation of underground equipment, and developed a comprehensive solution for wastewater treatment and deep reuse of reclaimed water with membrane separation as the core. Mine slime water is used as resource, which is treated to the state of reclaimed water and ultrapure water. All the waste water is directly reused to underground mining and equipment water, saving the cost of wastewater lifting and treatment.

Actual picture of underground mine water treatment project

The remarkable characteristics of the process chain are as follows:

        1,Considering the special situation of underground, the selection of electrical equipment should be reduced as far as possible, and the process and equipment proved to be safe and reliable after years of application in the industry should be selected as far as possible to ensure the safe operation of underground;

        2. Through joint research and development with colleges and universities, the original well water treatment equipment shall be improved to make the equipment more intensive and modular;

        3. the whole system completes the modular manufacturing work of most of the equipment in the manufacturing plant through Inventor, SolidWorks and PDMS three-dimensional design, so as to ensure that there is no fire in the underground and the assembly is carried out directly;

        4. The DCS control system has built-in multiple operation plans. In case of sudden change of water quality, the system will carry out intelligent automatic disposal and adjustment according to the plan to ensure the safety of the system operation;