In the process of reclaimed water reuse in wastewater treatment, in addition to the widely used activated carbon, inexpensive adsorbents such as slag, coke, diatomite, lignite, peat, and clay can also be used. However, their adsorption capacity is small and the removal rate of pollutants is not high.
In addition, synthetic macroporous adsorption resins can effectively remove refractory organic substances in wastewater, especially phenolic compounds, surfactants and dyes. The recovery of phenol from phenolic wastewater by macroporous adsorption resin, the removal of trinitrotoluene from explosive wastewater, the recovery of sodium alkylbenzene sulfonate from washing wastewater, the removal of sulfonated lignin from pulp wastewater, the removal of chemical oxygen demand and dyeing properties from cotton printing and dyeing wastewater, and the removal of refractory organic matter and color from secondary treatment wastewater of urban water reuse have been carried out.
By regenerating the failed macroporous adsorption resin with dilute alkali solution or organic solvent, useful substances such as phenol and lignin can be recovered from the solution recovered from dilute alkali solution or organic solvent. This adsorbent is still in the stage of research and development.
