Study On Biological Denitrification Of Steady SBR Compound Technics For Glutin Wastewater

The characteristics of glutin manufacturing wastewater are high contents of calcium, alkali and organic albumen, all of which, calcium and alkali come from the working procedure of lime-soaking in glutin manufacturing. Glutin lime-soaking wastewater accounts for a heavy proportion during glutin manufacturing and jeopardizes seriously, so it is relatively difficult to treat. Because there is high content of organic nitrogen in glutin lime-soaking wastewater, the removal of nitrogen in the wastewater is of significance to prevent water-body from eutrophication.This study places an emphasis on the treatment of glutin lime-soaking wastewater, first experimental studies are made aiming at the two-stage SBR denitrification technics for exploring steady, economical and efficient biological denitrification technique of glutin manufacturing wastewater.According to the glutin manufacturing technics, the experiment makes the glutin lime-soaking wastewater by simulation and processes drainage quantity Stat. and water quality analysis.At first, the author has studied the single-stage SBR technics of glutin lime-soaking wastewater and this establishes a foundation for next study of the two-stage SBR denitrification compound technics. The experiment has been done on the treatment of glutin lime-soaking effluent by the two-stage SBR technics of hydrolyzation- nitrification/denitrification, and ascertained the optimal operating procedure of the two-stage SBR technics by the culture process of sledge. The experimental research results show that: primary one-hour aeration and following ten-hour stir in the foregoing hydrolyzation stage, 2.5 hours aeration and three-hour stir in latter ND stage circulate, DO and pH in different reaction stages are strictly controlled, in addition, phosphor is supplied to the system and carbon source is added in denitrification stage, better removal efficiency of CODcr and nitrogen can be attained in the instance of denser CODcr and TKN with one period of 24-hour. In effluent, CODcr is less than 100 mg/L and NH4-N is less than 5mg/L. Removal rate of TN is more than 80%.In the two-stage SBR technics of hydrolyzation- ND, the effect of the treatment system influenced by CaCO3' s massing in sludge is studied. The results indicate that: sludge not being pickled with hydrochloric acid, the content of CaCO3 massed in sludge has been up to 25% and SVI has reduced to 50 or so after circulation of 120 periods, butthese have not any kickback to the treatment system.Besides, on the basis of the two-stage SBR technics of hydrolyzation-ND, hydrolyzation stage is changed for nine-hour aeration, then the results show that: the content of CaCO3 massed in sludge has been more than 50% after 50 periods, which leads the system unable to circulate normally. After sludge has been pickled with hydrochloric acid, the system comes back to normal effect and water quality of the effluent is steady. In effluent, CODcr is less than 150 mg/L and its removal efficiency is more than 90%, but concentration of NH4-N and TN is still thicker and the effect of denitrification is of a sort.