Study On The Application Of Supercritical Water Oxidation To Molasses Alcohol Wastewater

The paper systematically summarized current treatmeant technology of molasses alcohol wastewater, reviewed the properities of supercritical water oxidation(SCWO) and universal research work in the field .The author prosposed applying SCWO to the treatmeant of molasses alcohol wastewater,and studied basic work on the application. The work and the results follow as:1, The characteristic of molasses alcohol wastewater was observeed. 1st ,the pH value of the wastewater is about 4.13,as an anti-corrosion method,pH value shoud adjust to about 8.0 and eliminate the flocculation created.2nd,the thermal energy the reaction created was about 1.93×106kJ per ton,in addition to sustain the reaction,the surplurs energy recycled was 1.42×106kJ per ton.3rd ,to avoid formation of carbon ,the temperture of preheated should keep under 165℃ .2, The pretreatmeant of neutralization-sedimentation has been studied.With the lime cream neutralization to adjust the pH value,the optimum condition obtained was, PAC 10~50mg/100ml wastewater ,PHP-2 0.06~0.09mg/100ml wastewater ,mixing 2 min, stirring velocity 100~300rpm ,and reacting 15min ,stirring velocity 50rpm.3, The factors and the regularity effecting the removal rate of COD has been studied, the result indicated that COD removal rate of organic pollutant will increase with the increment of reaction temperature, oxygen pressure , reaction time ,among which temperature and reaction time are main factors effecting the removal rate of organic pollutant. Oxygen pressure has little influence on the oxidation decomposition of the organic pollutant. Under the reaction temperature 400℃,after 1 min, the treated wastewater meet the 3rd grade of Comprehensive Wastewater Discharge Standard,(GB9878-1996 China);10 min ,the removal rate of COD reach up to 99.9%,meet 2nd grade;and, 20 min, the 1st grade.4, The kinetics of oxidation degradation of molasses alcohol wastewater were studied .The results indicates when the range of temperature were from 3600C to 4000C,the pressure of oxygen was 6.0MPa,Ea was 275.89kJ/mol ,A was 1.66×1015. The reaction order of organics pollutants was betweem1.0~2.45 and,oxygen was 0.5,In the process of CSCWO, the catalysts Cu/Ce(3:1)and Cu:Mn:Fe(0.5:2:0.5) has little infullence on the oxidation decomposition of organic pollutants.