| EM(Effective Microorganisms) is a new kind of micro-organism-activated reagent,which is composed mainly by photosynthetic bacteria,microzyme, lactobacillus,and other effective bacteria.The important point studied in this paper is EM addition to the SBR,setting up high- efficient EM-SBR reactor,effect of EM addition to the SBR on the removal speed and removal rate of COD,total nitrogen, total phosphorus,at the same time,the factors that affect the quality of effluent such as sludge retention time,quantity of EM,toxicant in the influent has been studied in this paper.Five reactors have been used for experimentation under same conditions,they were:1st reactor,the normal reactor;and 2nd-5th reactor has EM addition for 0.1‰,0.5‰,1‰,5‰,waster water used in this experimentation is municipal sewage.The result shows:(1) In the cycle experimentation,the average removal rate of COD are relatively high in five reactors,were all above 80%,and has no obviously different between them;the average removal rate of TP increase as the increasing of EM inoculation;the average removal rate of NH3-N are no obviously different between five reactors;there are considerable enhance of TN removal rate of reactor that added EM,the TN removal rate of the 5th reactor is 22.4%higher than the 1st reator.(2) The five reactors has no obvious different of their NH3-N after sludge retention time has been adjust to 25 days,but has obvious effect in the removing of TN and TP,the TN removal rate of 1st,3rd and 5th reactor has increase by 10%,3% and 5%compared to previous;the TP removal rate of 1st,2nd,3rd and 4th reactor has decrease by 31%,37%,38%and 32%compared to previous,but the TP removal rate of 5th has increase by 9%.(3) There is no obvious relationship between removal speed of COD and inoculation of EM;as the phenomenon in cycle experimentation,the average removal rate of TP increase as the increase of EM inoculation,effect has expressed most evident in 5th reactor,reactor added EM has higher removal rate and speed on two processes of removing TP,it could shorten aeration time for 3 hours for it having higher nitrification speed than 1st reactor,the 5th reactor has 21%of TN removal rate higher than 1st reactor.(4) As a whole,reactor added EM has stronger ability to bear toxicant than 1st reactor.Take the removal rate of NH3-N for example,reactor that added EM has comparatively stable concentration of NH3-N in effluent,when the adding quantity of phenol is 400 mg/L,the removal rate of NH3-N in 1st reactor just only 62%compared to 98%in 5th reactor and the 5th reactor has 35%of TN removal rate higher than 1st reactor.In a word,EM has some positive effects on removing of contamination in wastewater.The research experiments provide the engineering of wastewater treatment with reference data of practicable values. |
