| Coking wastewater is one of the high salt refractory wastewater,the completion after deep treatment by membrane treatment to form strong water,grows the reverse osmosis water(RO)with direct evaporation crystallization process for processing,but due to the high concentrations of toxic and harmful substances,mixed salt as black paste to crystallize,and in the process has such problems as serious membrane fouling,and blockage of the equipment.Therefore,it is necessary to further degrade the reverse osmosis concentrated water.Fenton oxidation process is widely used in the treatment of industrial wastewater that is difficult to degrade due to its ability to produce hydroxyl radical(·OH)with strong oxidization ability,but it has some limitations such as low efficiency and insufficient reaction.At present,according to the characteristics of different water quality,Fenton oxidation treatment and other processes are combined to treat industrial wastewater.This research on coking reverse osmosis water as the research object.The organic matter in the water was enriched by adsorption and concentration with highly selective activated carbon,and then the heterogeneous reaction with Fe0-C micro-electrolysis and Fenton coordination was carried out.The difference of activated carbon before and after adsorption and oxidation,molecular weight range and biological effect in water were studied.This can solve the problem of reverse osmosis water treatment.The main results and conclusions are as follows:(1)The main organic matter in the coke reverse osmosis concentrated water was<30 KDa,there are more monocyclic and partial heterocyclic and polycyclic aromatic hydrocarbons.Four kinds of activated carbon with different specific surface area and porosity were used to adsorb the organic compounds.It was found that P-1400-Y activated carbon could adsorb the organic compounds mainly in the micropores and mesopores at 1～10 nm.The main organic compounds were monocyclic substances<10 KDa and some nitrogen-containing heterocycles,chlorinated hydrocarbons and polycyclic aromatic hydrocarbons(PAHs).The adsorption capacity of can reach 200 mg/g.(2)Fe0-C micro-electrolysis-Fenton reaction was carried out on the adsorbed activated carbon and wastewater.After activated carbon adsorption and enrichment of wastewater,micro-electrolysis could open the ring of 12.02%of organic matter on the activated carbon and release small molecular fat chains into the water,which was beneficial to the subsequent degradation of organic matter on the water and activated carbon by Fenton.The micro-electrolysis-Fenton reaction was mainly aimed at adsorption>2 nm mesoporous and macroporous organic matter.After desorption and adsorption,the activated carbon can still continue to adsorb new substances.After Fe0-C micro-electrolysis-Fenton reaction,the organic matter is mainly monocyclic and concentrated<10 KDa in the molecular weight range.(3)The biotoxicity caused by components in water was characterized by using internationally recognized spirocystis subcapricephala as an indicator plant.Compared with the nutrient solution before and after Fe0-C micro-electrolysis Fenton treatment,the effluent still has significant toxicity,but the toxicity of effluent is reduced to some extent.The salinity and organic matter in wastewater can synergistically affect the growth and change of algae,but the high salinity in water is the main reason to inhibit the growth of algae.At the same time,the overall metabolic capacity of carbon source of microorganisms in effluent was higher than that in raw water,and their preference types changed.Microorganism has a better utilization rate of fast carbon source in water.Through the above research,by using activated carbon to enrich organic matter in water,Fe0-C micro-electrolysis Fenton synergism can further treat activated carbon and wastewater,activated carbon can be adsorbed again,wastewater can meet the reuse requirements of other water.Wastewater generated by desorption can meet the requirements of evaporation and crystallization. |
PDF Full Text Request