电化学氢自养与硫自养集成去除饮用水中的硝酸盐

研究了一种电化学氢自养与硫自养集成去除饮用水中硝酸盐的方法，将2种自养反硝化集成，既可减少以硫作为电子供体产生的SO4^2-，也可以使硫自养反硝化产生的H^ 作为电化学产氢的前驱物。同时，在硫自养段可不添加调pH的CaCO3，避免了出水的硬度升高。试验结果表明，在反应器的水力停留时间（HRT）为1．9－5h，最小电流相应为3－16mA时，NO3^--N去除率达90％以上，出水中NO3^--N和SO4^2-浓度分别低于3．0mg/L和170mg/L,NO2^--N未检出，硫段和电氢段出水pH值均维持在中性附近。

Electrochemical hydrogen and sulfur autotrophic denitrification combined process in drinking water treatment

An electrochemical hydrogen and sulfur autotrophic denitrification integrated process was studied.In this process the sulfate production could be decreased in the effluent. The H\++ produced in the sulfur part could migrate to the electrochemical part and form hydrogen gas at the cathode, which was helpful to hydrogen denitrification. The limestone used to adjust pH in the sulfur part was not necessary, the hardness increase can be avoided accordingly. The results showed that. When the HRT was 1 9 to 5h and the corresponding minimum current was 16 and 3mA, the reactor could yield excellent results as follows. The NO - 3 N removal efficiency was above 90% and even up to 100% and the nitrate was lower than 3 0mg(N)/L and SO 2- 4 was lower than 170 mg/L, moreover, no nitrite was detected in the effluent. The sulfur and electrochemical part effluent was kept neutral.