Wastewater regeneration

Wastewater regenerationSystem:

1. Thermal regeneration is a widely used regeneration method with the longest development history. Due to its ability to decompose various adsorbates, thermal regeneration has universality and good regeneration effect, and has always been the mainstream of regeneration methods. Hot regeneration has the advantages of high regeneration rate and short regeneration time (30-60 minutes for granular carbon and a few seconds for powdered carbon). The gases produced by high-temperature pyrolysis are hydrogen, methane, and carbon monoxide, which are burned with excess oxygen from the combustion engine at 500-700 degrees Celsius. The resulting products are also carbon dioxide and water, and the heat generated is fully utilized in the drying section for drying the feed activated coke with a moisture content of about 40%, achieving the goal of energy conservation and environmental protection.

2. Oxidation regeneration is relatively simple to operate, has little impact on adsorption capacity, and has a low carbon loss rate; The equipment requirements are very high, and there are many ancillary facilities in the system. The oxidation solution and exhaust gas need further treatment

3. Solvent extraction method, non-destructive, is usually used in high-value product recycling processes. One extraction solvent can only desorb certain types of pollutants. However, the composition of pollutants in the water treatment process is complex and variable, so a solvent treatment has low efficiency and cannot desorb all pollutants. In addition, certain chemical solvents have strong corrosiveness, which can damage the pore structure of activated coke, corrode the surface of activated coke, and thus affect the adsorption capacity and mechanical strength of activated coke.

4. Biological regeneration has no damage to the structure of activated coke, and the regeneration process and equipment are relatively simple. The degradation rate of microbial activated coke adsorption of pollutants is slow, resulting in a longer cycle for restoring the adsorption capacity of activated coke. Moreover, microorganisms have selectivity in adsorbing pollutants onto activated coke Waste activated coke that adsorbs pollutants that cannot be degraded by microorganisms cannot be regenerated using this method.

5. Supercritical fluid regeneration does not change the chemical properties of pollutants adsorbed by activated coke, nor does it affect the original structure of activated coke. There is no carbon loss during the regeneration process of activated coke, and the adsorption capacity of activated coke can be restored after regeneration,

After the pollutants adsorbed by activated coke are desorbed, they need to be collected centrally and disposed of uniformly, which poses a risk of secondary pollution and is costly. The disadvantage of this method is that it requires high technical and equipment requirements for the process, and the investment cost is high

6. Microwave radiation regeneration, short heating time, no need for intermediate media, no temperature gradient in the microwave field, good uniformity of heat distribution, high efficiency, high requirements for process equipment, and the microwave heating process is closed, the evaporated substance cannot be eliminated in a timely manner, high risk, and high energy consumption

Wastewater regeneration