Study On The Treatment Of Dioscoreae Zingiberensis Diosgenin Wastewater By Iron-carbonmicroelectrolysis-Fenton-flocculation-EM

Through investigating technology of Diosgenin and analyzing water quality of Diosgenin wastewater,a program of Dioscorea zingiberensis Diosgenin wastewater manegement, which is conducted by iron-carbonmicro electrolysis-Fenton-flocculation-EM, is designed and tested. The result, which derives from the probe of iron powder dosage, carbon powder dosage, iron-carbon ratio, the pH value of inflow water, dosage and addition method of H2O2, the pH value of Fenton-after outflow water, dosage of potassium permanganate, dechlorinate or not by anion resin after addition of potassium permanganate, optimal functional tine and optimal dosage and optimal pH condition of EM bacteria, is presented as follows:(1) The management effect reaches the best as the pH value of iron-carbon micro electrolysis inflow water is3.5. Meanwhile, the concentration of iron powder is0.75g/50ml wastewater, carbon powder is0.25g/50ml wastewater, and weigh ratio of the two is3:1.(2) The optimal dosage of H2O2is3ml/50ml wastewater. It is better to add H2O2twice separately,1/3the first, and the rest20min later, rather than only once, the removal rate of CODcr reaches95.3%.(3) Adjusting the pH value of wastewater to around9.5after the iron-carbon micro electrolysis-Fenton is completed, the peak of removal rate of original water CODcr appears as about97.8%. The addition of quicklime for flocculation removes a large number of sulfate ion in original water, and the hydroxyl ion from which oxygenize the redundant ferrous ion; adding more alkali to increase the pH after flocculation not only precipitates the iron ion completely, declining the influence to COD, but also decrease the chroma of outflow water.(4) Taking all in consideration, the optimal dosage of potassium permanganate (at the concentration of1%) is15ml per50ml wastewater.(5) Optimal functional time of EM bacteria is7d; optimal dosage is0.9%; optimal pH is5, the effect of EM bacteria on the dechlorinated wastewater is obviously higher than that on chlorinated wastewater. (6) As to the organic Dioscorea zingiberensis diosgenin wastewater, the removal ratio of CODcr is over98%by this technology commonly.