Of Heavy Metals On Biological Phosphorus Removal

Bascd on biological phosphate removal mechanism andtoxicology, theoretical analyses and tests are combined to study on the effectof heavy metal on biological phosphate removal in this paper.The self-designed Sequencing Batch Reactor (SBR) and interlmittentreactor are used to verify the characteristic that Poly-P micro-organismsrelease phosphate under anaerobic condition and take up phosphate underaerobic condition. The traditional belief that good efticiency of phosphateremoval can be obtained by prolonging aerobic stage is challenged in thispaper. Based on three groups of intermittent tests conducted to observe theeffect of heavy metal on aerobic phosphate uptake, the view that high-concentration heavy metal will be toxic to aerobic phosphate uptake ispresented in this paper. The joint effect of two groups of combined metal isstudied and analyzed on the basis of toxicology.The fact that SBR has good capacity of removing phosphate is tested, andthe effect of Cu on the whole phosphate removal process is studied. Theeffect of heavy metal on phosphate removal after addition of poweredactivated carbon (PAC) is observed, and the conclusion that PAC can improvethe capacity of SBR to resist metal shock is drawn in this paper. The viewthat acclimatized sludge can have good capacity of removing phosphate forsewage containing high amount of heavy metal is presented in this paper.