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In order to investigate the effective method of COD removal from desulfurization wastewater, acidmodi ed y ash (AFA) and base-modi ed y ash (BFA) were prepared by impregnation method. Then, magnetic coagulants (Fe-AFA, Fe-BFA) were prepared by mixing the modi ed y ash with magnetic components. The structural characterization results showed that the speci c surface area and the porosity of y ash were obviously increased after modi cation. Fe-AFA magnetic coagulant has the best performance and superparamagnetism. Under the same experimental conditions, the maximum COD removal amounts of FA, BFA, AFA, Fe-BFA and Fe-AFA were 2.180, 3.209, 4.631, 3.710 and 5.687 mg/g, respectively. The COD removal amount of Fe-AFA was increased by 112.43% compared with the raw FA.The quasi-second-order kinetic and Langmuir equation could well t the COD coagulation process of ve coagulants. After ve cycles, the COD removal amount of Fe-AFA was 2.735 mg/g, and the removal rate still reached 67.53%. These ndings provide a feasible method for the treatment of y ash from coal-red power plants and the preparation of highly e cient COD trapping magnetic coagulants.

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A catalyst (V-Cu-Ce-ZSM-5) was explored to simultaneously remove the SO 2 and NOx from ue gas by use of the ZSM-5 molecular sieve as the carrier, V and Cu as the active components, and Ce as the additive in low temperature of 150℃. The performance of V-Cu-Ce-ZSM-5 was evaluated for the oxidation of NO and SO 2 before and after the addition of graphene oxide (GO). The results showed that V-