Enhancement Of Nitrogen Removal Efficiency Of Anaerobic Ammonium Oxidation Treatment Of High-salt Wastewater

The performance of biological nitrogen removal in treating seawater-containing wastewater is not satisfying.So we used the acclimation of a freshwater-origin anaerobic ammonium oxidation?Anammox?sludge having been domesticated by seawater.The effects of potassium ion concentration on nitrogen removal efficiency were studied in short term by Anammox sludge.The results showed that appropriately add potassium ion can effectively increase reaction denitrification efficiency.The influence of potassium ion in Anammox sludge was mainly divided into four stages in the short-term.The adaptive phase,potassium ion concentration?0² mmol//L?,Anaerobic ammonia oxidation adapt the presence of potassium ion.The removal rate of NH₄⁺-N and NO₂^--N has increased,but don,t have obvious effect on denitrification efficiency.The ascension phase?2⁸ mmol/L?,potassium ion has a promoting effect on anaerobic ammonia oxidation system,nitrogen removal rate significantly increased.The stabilization phase?8²0 mmol/L?,the nitrogen removal rate has fallen,but still higher than not add potassium ion.The Inhibition phase,the nitrogen removal rate decrease gradually with the increase of the concentration of potassium ion greater than 20 mmol/L so that the activity of Anammox has reduced.In the whole cycle,when the concentration of K+ was 8mmol/L,it achieved the best effect,the average removal rate of NH₄⁺-N and NO₂^--N were 89.24% and 84.87%,NRR was 1.113 kg N/?m³·d?.For SBR process of high salt wastewater anaerobic ammonia oxidation?Anammox?process,make the influence of glycine betaine to Anammox activity,ammonia nitrogen and nitrate nitrogen removal efficiency as the key points,research the betaine on Anammox of nitrogen efficiency effects.The results show that:?1?It has obvious improvement effect to the system of denitrification efficiency by adding the betaine concentration of 0.1⁰.4 mmol/L.It alleviates salt stress on bacteria growth inhibition of Anammox,also promoted the growth of denitrifying bacteria;Glycine betaine concentration for 0.4⁰.5 mmol/L as the growth of denitrifying bacteria have the advantage,also show the promoting effect in the reaction.When Glycine betaine concentration is greater than 0.5 mmol/L,it has been unable to alleviate salt stress on inhibition of reactor denitrification efficiency,finally in betaine concentration for 0.8 mmol/L have complete inhibition on the reactor.?2?When the concentration of glycine betaine add 0.3 mmol/L,the removal efficiency of the Anammox reaction achieve the best,NH₄⁺-N and NO₂^--N increased by 16% and 32% respectively,NRR increased 26.8%.?3?at the end of the recovery experiment,after 25 cycle run,when the betaine concentration fell to 0.2 mmol/L,with the decreasing concentration of betaine reactor denitrification efficiency to get fast recovery,indicating that betaine affect reactor is reversible.In exogenous dosing trehalose trials found that:?1?in the stable operation of anaerobic ammonia oxidation of high salt waste water system,The denitrification efficiency of adding the trehalose has obvious improvement effect,when the concentration is 0⁰.35 mmol/L,adding trehalose reduced salt stress on anaerobic ammonia oxidation bacteria growth inhibition;Betaine concentration of 0.4¹ mmol/L,the trehalose concentration of anaerobic ammonia oxidation bacteria inhibition but still promote the denitrifying bacteria.Trehalose concentration is greater than 1mmol/L,after adding trehalose,it has an adverse effect on denitrification efficiency of reactor,in the end when the trehalose concentration tendency for 1.6 mmol/L,it produce inhibition.?2?under the concentration for 0.35mmol/L,NH₄⁺-N and NO₂^--N average removal rate were 92.35% and 97.36% respectively,NRR 1.29 kgN/?m³.d?,the anaerobic ammonia oxidation of nitrogen efficiency to achieve the best effect,compared with 0 mmol/L,NH₄⁺-N and NO₂^--N removal rate increased by 53.8% and 53.8% respectively.