The Experimental Study Of Shortcut Nitrification-denitrification Using Sequencing Batch Reactor

In the water environment the nitrogen element massive accumulation shave causedthe water environment quality serious worsening, uses the effective preventing andcontrolling measure to melt this harm, is question which at present urgently awaits to besolved.How did this research center on nitrogen removal to launch effectively,summarizes introduced in the water body the nitrogen origin, the harm as well as nitrogenremoval the technical present situation with the new ester search tendency, emphaticallyintroduced the nitrous acid biology nitrogen removal technology condition, introducedthe SBR processing industrial waste research development.This topic in the domestic and foreign nitrous acids biology nitrogen removal aspectnewest research results foundation, in view of soaks the bean waste water by the ordinaryactive sludge to take the vaccination sludge, in the SBR reactor according to the nitrationresponded when conclusion Dissolved oxygen rapidly elevates the theory, promptlyterminated the nitration to respond cultivated by the bacillus nitrosomonasprimarilyactive sludge.In in the success raise sludge foundation, through to the SBR reactionsystem in movement parameter the and so on pH value, DO, ammonianitrogen load,organic load, temperature regulation, has thoroughly studied the Sequence batch reactornitrous acid biology nitrogen removal influence factor and removes the effect, and hascarried on the discussion to its microbiology mechanism.The experimental resultindicated that:1. In the nitrification process may achieve the pH control about 8.0the highest NO₂^--Ntransformation speed, thus best realization nitrous acid biology nitrogen removal; PH hasbeen low can have the adverse effect to the nitrification process but haigh to suppress thedenitrification thus to affect TN to remove the effect.2. The nitrous acid biology nitrogen removal DO value should control about0.5mg.L^-1,if DO low (0.2～0.3mg.L^-1) although also can carry on the nitration to respond, butNH₄⁺-N removes the speed to be quite slow; If DO has been high (surpasses 1.5～2.8mg.L^-1) in the system nitrifying bacteria to crush the nitrosation fungus to occupy theobvious superiority to cause nitrogen removal the process still to continue traditional thenitration counter- nitration route. 3. When nitration cycle movement initial FA is 5～20mg.L^-1, the nitrifying bacteriahas obviously come under the suppression, more over FA higher, this phenomenon ismore obvious. The high ammonia nitrogen load as well as the free ammonia density (FA)may take under the normal temperature in SBR realizes a short distance biology nitrogenremoval important method.4. The different organic load as well as nitrogen removal in the process nitrosationrate influence is not certainly obvious to NH4+-Nremoveing rate, but a higher organicload is easier to realize higher CODcr removeing rate. Moreover when enters waterCODcr/NH₄⁺-N=2,BOD₅/NH₄⁺-N only was 1.2 time NH₄⁺-N removeing rate has achieved100ï¼…,but regarding the traditional nitration counter- nitration nitrogen removal process,generally thought nitrogen removal in the process when BOD/TN=3-5carbon origin couldsatisfy the counter-nitration the need, this reflectedthe short distance biology nitrogenremoval saved carbon origin characteristic.5. Continues the movement confirmation through the high temperatureunder to SBR,the high temperature not only can enhance nitrogen removal the process to respond thespeed, reduces the reaction time, more importantly other movement condition same whent=35℃when is more obvious than the t=-20℃time nitrosation phenomenon, in otherwords controls the nitration stage realizes one of elimination nitrifying bacteria methodsin a higher temperature.6. The best operating process experiment by NH₄⁺-N=100mg.L^-1,CODcr=800mg.L^-1enters the water density, and the pH control in 7.8～8.2, the DO control continues in0.5～0.6mg.L^-1 to move SBR, basically eliminated the nitrifying bacteria, in the SBRmovement process NO₃^--N continuously maintained at the extremely low level, thenitrosation rate had basically achieved above 90ï¼…, better has completed the nitrous acidbiology nitrogen removal, NH₄⁺-N removeing rate has achieved 100ï¼….To affects the nitrous acid biology nitrogen removal other condition factors to waitfor further studies.