The so-called zero emissions, refers to the infinite reduction of pollutants and energy emissions to zero activities. Zero emissions, as far as its content is concerned, one is to control the energy and resource emissions that have to be generated in the production process and reduce them to zero; the other meaning is to make full use of the energy and resources that have to be emitted to eliminate non-renewable resources. And the existence of energy.

"Zero discharge" of wastewater means that after repeated use of industrial wastewater, this part of the salt content and pollutants are highly concentrated into wastewater (more than 99%) for recycling and reuse, and no waste liquid is discharged from the factory. The salts and pollutants in the water are concentrated and crystallized to be discharged in solid form and sent to the landfill of the waste treatment plant or recycled as useful chemical raw materials.

Domestic Existing Means of Realizing "Zero Discharge" of Wastewater

At present, the industrial wastewater treatment technologies widely used in China mainly include RO (reverse osmosis membrane double membrane method) and EDR technology. Their main materials are nanoscale reverse osmosis membranes, and the target of this technology is ions (heavy metal ions) and organic matter with molecular weight above several hundred.

Its working principle is that under certain pressure conditions, H2o can pass through the RO permeable membrane, while inorganic substances, heavy metal ions, macromolecular organic compounds, colloids, bacteria and viruses dissolved in water cannot pass through the permeable membrane. Thus, the permeated pure water can be separated from the waste water containing a high concentration of harmful substances.

However, using this technology, we can only get about 60% of pure water, and the remaining wastewater containing high concentrations of harmful substances can not avoid the end of being discharged into the environment, and these high concentrations of heavy metal ions and inorganic substances are extremely harmful to our environment.