Research Of Anammox Dispose Refining Catalyst Production Wastewater

In order to reduce the concentration of ammonia nitrogen in the wastewater from the refinery catalyst production and meet the national emission standards,the treatments for simulation water of the refinery catalyst production wastewater was researched in this paper.The biological removal of nitrogen were the partial nitrification and anaerobic ammonia oxidation(ANAMMOX).To providing reference for the recovery stage of the on-site pilot plant,the operating conditions of the partial nitrification reactor were optimized,the method of anaerobic ammonia oxidation filter activity recovery was determined,and the changes of the microbial community structure in the anaerobic ammonia oxidation biofilter at different stages were explored by investigateing the start-up conditions of partial nitrification bioreactor under medium-temperature and limited oxygen conditions,the recovery of biological activity of ANAMMOX biofilter placed for long-term dehydration and the start-up characteristics of ANAMMOX biofilter.The results showed:(1)The nitrite nitrogen accumulation rate was successfully stabilizedabove 95%by using a real-time control of the pH value in a partial nitration reactor(T=35±1°C,DO<0.2 mg/L).(2)The long-term ANAMMOX biofilter was successfully restored after 102 days of operation,and the total nitrogen removal rate increased from 0.190 kg N/(m~3·d)to 1.771 kg N/(m~3·d).The linear correlation coefficient between the value of?pH×Q and the total nitrogen removal rate of the filter was 0.919.The increment of the pH in the effluent can provide an effective reference for the progress of the biofilter activity recovery process.(3)The ANAMMOX biofilter was successfully started after 142 days of continuous operation.The total nitrogen removal rate of the biofilter was gradually increased from 23.55%to 83.14%,and stayedsteadily from 81.28%to 89.03%in the activity stage.The average total nitrogenremoval rate was reached 7.84 kg N/(m~3·d),and the removal of ammonia nitrogen:removal of nitrous acid nitrogen:the amount of nitrate nitrogen generated was 1:1.53:0.18.(4)16S rRNA gene sequencing was used to analyze the changes of microbial abundance,diversity,and population structure of filter A in the active restoration and filter B in the start-up process.Among them,dominant microorganisms in the filter ponds A and B were mainly Ignavibacteria,Anaerolineae,Planctomycetacia,and Betaproteobacteria;Denitrifying bacteria Denitratisoma in filter B,further confirming actual trinitrogen variation ratio is inconsistent with the theoretical value due to denitrification in the system.