| A systematic study with application of Effective Micro Organisms (EM) and the relative techniques has been done in the field of municipal domestic sewage treatment, brewery wastewater treatment and algae-type eutrophical water treatment. From the study above, the biodegrading ability and effects of EM on domestic sewage organics, the resistance of EM on some regular heavy metal ions in wastewater, the culturing and domestication of EM active sludge under the condition of both self inoculation and digested sludge as seed, the starting-up of EM Sequencing Batch Reactor (SBR) and its operation effects on domestic sludge treatment, performance of EM Aerobic Bio-Filter Reactor (ABFR) on brewery wastewater treatment, the operation effects of KMT (or EM-KMT) Fluidized-Bed Biofilm Reactor (FBBR) on municipal sewage in pilot, the restraining effects of EM on some regular algae making for water eutrophication and the controlling effects of EM on water algae-type eutrophication in preliminary examination were investigated comprehensively. As the results, the application value of EM in the field of water treatment and its' relative possible mechanisms for some biological activities have been showed roundly and thoroughly in this study. Experimental results demonstrate as below:(1) When the settled domestic sewage is used as influent at temperature 25 癈, HRT 48hr, pH 8.0 and at EM casting proportion (VeM/Vsewage) 1/100000, the CODcr and BODs removal efficiency in effluent appear at 75.92% and 89.57% respectively. Under the condition of aerobic, VEM/Vsewaae 5/1000, the increasing amplitude of CODcr removal efficiency of NFU+-N in effluent is about 37.62%. Under the condition of anaerobic, VEM/Vsewage 1/100000~1/1000, the increasing amplitude of CODcr removal efficiency of NO2"-N in effluent is about 13.5%~14.8%.(2) The allowable volume mass of EM on 7 kinds of heavy metals ion in wastewater such as Cu2+, Zn2+, Pb2+, As3+, Cr6+, Cd2+ and Hg2+ are respectively about 0.50, 1.00, 1.00, 0.05, 0.50, 0.50, 0.10 mg/L. The result tells that the resistance ability of EM on Cu2+, Zn2+ and Cr6* in wastewater is lower a little bit than general sludge microorganisms.(3) While culturing EM active sludge and starting up the EM-SBR at the same time by taking the settled sewage as influent and by the condition of self inoculation, the stable CODcr removal efficiency in effluent is about 75.89% and increases averagely about 9.20% than the routine reactor at the same culturing model. At the same operating condition, the stable CODcr removal efficiency of the one with digested sludge as seed is about 81.10% and increases averagely about 12.47% than the routine reactor at the same culturing model. The suitable operation model for EM-SBR to treat domestic sewage is that 0.5 hr is for influx, 4.0 hr for gas pumping, 1.0 hr for holding, 0.5 hr for pouring and 1.0 hr for slacking. As the results, EM-SBRis provided with those advantages such as shorter HRT (6.0 ~ 9.0 hr), better treatment effect, better operation stability, lower energy charge and lower operation cost than routine SBR.(4) The correlative indexes of EM active sludge such as SV30, MLSS, SVI and sedimentation speed ( time for 95% of total sludge to settle down) all decrease by some degrees than the routine active sludge in that the decreasing range of SVI is about 19.37% and the sedimentation speed about 3.5 min. The congregating and sedimentation capability, the biodegrading ability on sewage organics called "active" of EM sludge grain are all obviously improved and reinforced.(5) Run the KMT and EM-KMT Fluidized-Bed Biofilm Reactor in the pilot plant (240t/d). The result tells that main indexes of effluent from both KMT and EM-KMT can all reach the National Standard for Industrial Cooling Water. Removal efficiencies of BOD5, CODcr and SS in KMT FBBR can all reach 75%~95%. Each one in EM-KMT FBBR can increase respectively 16.6%, 13.8% and 14.3% than in KMT FBBR, but the adaptability of the reactor on temperature accordingly decrease a little and s...
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