Efficiencies Of Hydrogen Production Performance Of Pretreated Surplus Sludge

With the strengthening of environmental awareness，both the sewage treatmentrate and the level of treatment have a gradual increase，so the surplus sludgeproduction gradually increased. The remaining sludge is rich in protein， fat，cellulose， hemicellulose and lignin polymer organic material， the utilizing of theseorganic bio-hydrogen production， reduce environmental pollution and have accessto the double meaning of hydrogen energy.To the promotion of research sludge anaerobic fermentation hydrogenproduction process progresses， especially to improve the sludge fermentationhydrogen production efficiency，the study after the electrochemical pretreatmentsludge as a substrate for ethanol-type fermentation sludge was investigated aftertreatment solids content of the sludge，TCOD，settling，dehydration and otherchanges，the depth of the hydrogen fermentation hydrogen production systemperformance.(1) Ethanol type fermentation bacteria can been cultured with the glucoseliquid （C：N：P of200：5：1）laboratory manual configurated， its Cultivationwas completed for99days at HRT of8.0h，temperature35℃，organic load of thestartup with COD3000mg/L. Ethanol and acetic acid content of the effluent sludgecompleted Cultivation was accounted for about68%of the total volatile acids，CODremoval of the system kept between21.2%~29.6%，the pH of the reactor wasalways kept in the range of4.12~4.32.(2) Inoculation own rich culture ethanol-type fermentation sludge，Respectively， before and after pretreatment sludge as substrate for anaerobicfermentation hydrogen experiment， Electrochemical group reactor startup wascompleted in the20d，the control group Reactor started successfully in the17d.(3) After a successful startup to the two reactors，Operation performance werestudied in two different dosage rate of sludge anaerobic fermentation system，Studies have shown that: at the sludge dosage rate was5%，7%and10%，theelectrochemical group compared with the control group TCOD removal efficiency increased by12.4%，9.5%and4.7%respectively.(4) at the sludge dosage rate was5%，7%and10%， the concentration ofvolatile acids mud electrochemical group significantly decreased from the initial3350~3800mg/L reduced to3000~3200mg/L， the control group sludge from the823~1134mg/L down to804~820mg/L， an electrochemical group sludge dosagerate of5%，7%，10%，the percentage of the volatile component of ethanol and aceticacid were72.4%，69.3%，62.8%.(5) When sludge dosage rate changes，HRT changed，sludge solids content isdifferent，when the HRT was10d，14d，20d，electrochemical pretreatment groupcompared with the removal of the original mud TS group in turn increases the0.02%，14.3%and31.4%，VSS removal rates were increased by17.2%，20.8%and5.4%，VS removal rates were increased by6.1%，17.2%and11.3%respectively.(6) Total gas production and hydrogen production both electrochemical sludgegroup and control sludge group had increased to some extent in different organicload，when sludge dosage rate was5%，7%and10%，the average productionvolume of sludge in the control group were980mL/d，1800mL/d，2600mL/d，theaverage production volume of sludge in the electrochemical group sludge were1500mL/d，2800mL/d，400mL/d respectively. In the dosing rate of7%，the averagehydrogen yield of the electrochemical group sludge reached the maximum was0.0229L·H2/g·VS VS，at the time，the average hydrogen yield of the control groupreached the maximum was0.0208L·H2/g·VS.