Performance and Sludge Characteristic Changes in Process of Low Carbon Nitrogen Ratio and High pH to Start Short-range Denitrification
The widespread application of short-range denitrification anammox technology in wastewater treatment is based on the enrichment of sufficient short-range denitrification bacteria.By inoculating residual sludge,the short-range denitrification starting process for 77 d long in the upflow anaerobic sludge blanket(UASB)reactor based on the strategy of simply regulating and controlling the pH and carbon to nitrogen ratio(C/N)of the influent is studied.The results show that nitrite nitrogen is rapidly accumulated in the effluent under the condition of the influent C/N(～2.6)and pH(～9)in the reactor.After 40 d,the nitrite accumulation rate(NTR)remains stable in the reactor,and NTR is(54.67±7.29)％,which indicates that the short-range denitrification process has been established in the reactor.In addition,the NTR is still stable at(66.13±0.77)％by adjusting the pH of influent to 7.5.And the domesticated sludge is suitable for the PD process of conventional wastewater.The concentration of sludge in the reactor will increase under the condition of high pH.The adaptation of microorganisms to the influent will lead to a decrease of extracellular polymeric substances(EPS).The changes in the ratio of proteins and polysaccharides in EPS reflect the trend of sludge granulation.The results show that regulating the high pH and low C/N ratio in the influent can successfully start up the short-range denitrification process.The domesticated sludge can be used for nitrogen removal of PDA,especially in the simultaneous treatment of wastewater containing ammonia and nitrate,which has significant advantages.
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