New progress has been made in the demonstration project of near-zero discharge of industrial wastewater and resource utilization

[ Focus on Chemical Machinery and Equipment Network ] Recently, the team of Researcher Kong Lingtao from the Environmental Materials and Pollution Control Research Department of the Institute of Solid State, Hefei Research Institute, Chinese Academy of Sciences successfully completed the on-site demonstration of the national key research and development plan project "Near-zero industrial wastewater discharge and resource utilization in high-tech zones" Work
.
After more than two months of on-site commissioning and operation, the demonstration project has made breakthrough progress in the advanced treatment of pharmaceutical wastewater and achieved the goal of nearly zero discharge
.

 

At present, the annual discharge of industrial wastewater in China exceeds 20 billion tons.
Most of these wastewater contain high-concentration, refractory pollutants, and are highly toxic and difficult to treat
.
The substandard discharge of a large amount of industrial wastewater has seriously harmed the ecological environment and human survival, and restricted the further development of the society and economy.
Therefore, the realization of zero discharge of industrial wastewater and resource utilization has become the current research focus
.

 

The demonstration project takes the antibiotic production wastewater of Haikang Pharmaceutical in Anqing City as the research object.
The wastewater contains high concentrations of N,N-dimethylformamide (DMF), acetone, benzene rings, heterocyclics and other organic pollutants.
Typical highly toxic, refractory organic industrial wastewater
.
In view of the characteristics of water quality, the research team has developed a variety of high-efficiency Fenton-like catalytic materials.
By coupling high-efficiency micro-electrolysis-advanced oxidation processes, an enhanced pretreatment unit is constructed to carry out high-salt, high-chemical oxygen demand (COD) refractory industrial wastewater Research on the key technologies of biodegradability, formulate a zero-discharge treatment technology plan, independently design and develop a set of pilot plants that can treat up to 10 tons of wastewater per day
.
After pretreatment, anaerobic, aerobic, membrane biological reactors optimize the combination process a variety of processes (the MBR), membrane separation salt, evaporation and crystallization, to overcome the engagement between the process, the reactor is difficult and slow start, the quality and quantity of solution On-site problems such as imbalance and high volatility have opened up the technical route of zero-emission treatment
.
After more than two months of debugging, the equipment is operating stably.
The removal rate of the main pollutant indicators COD, ammonia nitrogen, total nitrogen (TN), total phosphorus (TP), etc.
are all over 99%, and the water reuse rate exceeds 92%, reaching Near-zero emission requirements
.
During the implementation of the project, 7 related SCI papers were published and 5 invention patents were applied for
.

 

Pharmaceutical wastewater belongs to a type of typical difficult-to-treat industrial wastewater with complex treatment processes and high technical difficulties.
The results of this demonstration have a good reference and reference value for the zero-discharge treatment of wastewater from other industries such as chemical industry, printing and dyeing, papermaking, electronics, etc.
The prospects are broad
.

 

　　The demonstration project took more than one year from preliminary preparations to completion and operation.
It has received strong support from Hefei Research Institute and Solid State Research Institute, as well as the active cooperation of Haikang Pharmaceutical Company, which ensured the smooth implementation of the project
.

 

　　This work was funded by the national key research and development plan project "Efficient Use of Water Resources" key special project, Anhui Province Science and Technology Major Special Project and other projects
.

 

　　Original title: New progress has been made in the demonstration project of near-zero discharge of industrial wastewater and resource utilization