| After conventional secondary treatment of urban sewage treatment plant effluent contains a considerable amount of ammonia nitrogen and nitrate nitrogen, total nitrogen,released into the river, lake, landscape water use such as the library or l can appear when the water eutrophication and black smelly water environmental quality problems, such as, led to the "three nitrogen" drinking water pollution.In China, the prevalence of domestic wastewater with low carbon source, resulting in too low urban sewage treatment plant secondary effluent nitrogen ratio, which makes the traditional biological nitrogen removal process denitrification depth greater difficulties encountered, it is necessary to study and the development of new technologies with low carbon source of non-biological wastewater denitrification.This paper focus on the effluent which comes from the low carbon-resource sewage and is treated by the conventional secondary treatment process at urbansewage treatment plant. The ultimate goal of this treatment is to reduce the total nitrogen to 11mg/L and to decrease the ammonia nitrogen to 0.5mg/L. This study takes electro-catalysis, EDI technology, EDI and electro-catalysis composite technology to reduce the nitrogen of the low carbon-resource sewage.TCMF, the composite packing, is a kind of very fine powder which is manufactured with iron powder, carbon powder and the catalytic elements(M and F) by patented technology. The experiments show that the reaction rate of this packing is very fast and the removal rate for ammonia nitrogen and CODcr.After the reaction column rolling for 60 min and the subsider rolling for 30 min,the removal rate of ammonia nitrogen is 16.7%. The no-diaphragm electrolysis system which composed with the titanium-matrix electrode which is rolled by the Fe-modified ACF and NiCo2O4 anode which has stable performance analysis of chlorine, only takes 60 min to reduce 95% of NO3-N, 20% of NH3-N,and 83.5% of TN.The fresh water chamber is filled with D407 and KDF. D407 is the anion resin which has specific adsorption to AgNO3 and KDF is the cation exchange resin which has specific adsorption to ammonia nitrogen. After 60min’s operation, the removal rate of NO3-N is over 98%, the removal rate of ammonia nitrogen is 65%, the removal rate of TN is 92% and the concentration of TN is2.0mg/L. The results of orthogonal test show that voltage and the concentration of influent are the main influence factors to the nitrogen current efficiency of EDI.Electricity to ion combined with electric catalytic technology was composed of electric catalytic I,.electrocatalysis II and electrode ionization.Concentrated water of electrodeionization returned to ecectrocatalysi s II.After 24 h,the removal rate of total nitrogen and ammonia nitrogen tended to be consistent, water production was less than 1 mg/L and total nitrogen amm onia nitrogen was under 0.5 mg/L.Run after a certain period of time, process can come to the electrocatalysis II period,which was composed with direct producti on of water and electrodeionization water operated in alternation manner.The cost of production of water produced by the electric catalytic run separately, electricity section I and electric plant operation and the combined operation of electro catalytic electro catalysis was 0.53-1.19 yuan.Compared with the traditional biological process, the combination of electro- ion and electro- catalysis has better effect on the low- carbon source sewage depth without increasing operating cost. |
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