Study Of Treatment Technology Of Wastewater Absorbing VOCs In Factory

Wastewater absorbing VOCs has features like high COD and non-biodegradation, it is hard to dispose with normal methods, it's impotant to find an economic and effective method to dispose wastewater absorbing VOCs. This paper respectively used Fenton oxidation and normal temperature UASB- Biological Contact Oxidation technology to dispose simulative absorbing acetone, ethyl acetate, xylol wastewater.1. Disposed simulated absorbing wastewater contained one component, two components and three components with lab-scale Fenton oxidation device, investigated the treatment effect of Fenton method; Observed the effect of dosage of H2O2 and Fe2+, pH value, reactive time on the degradation of COD; Confirmed the best parameters. The results showed follows.First, Fenton oxidation method had good effect for the absorbing wastewater contained one component, two components and three components. One unit COD cost the least H2O2 is absorbing xylol wastewater among the one component absorbing wastewater, when the pH is 7.3, COD:H2O2:FeSO4·7H2O=1:1.04:3.53(quality ratio), the COD remove ratio of the wastewater reached the best effect,71.36%; One unit COD cost the least H2O2 is absorbing acetone and xylol wastewater among the two components absorbing wastewater, when the pH is 7.3, COD:H2O2:FeSO4·7H2O=1:1.33:0.37 (quality ratio), the COD remove ratio of the wastewater reached the best effect,80.24%; When the pH is 7.5, COD:H2O2: FeSO4·7H2O=1:1.57:0.37 (quality ratio), the COD remove ratio of the wastewater reached the best effect,80.24%.Second, In Fenton experiment, dosage of H2O2 and Fe2+ had optimum value, the effect was better with the dosages increasing, but when it reached to be a certain extent, the effect increased not obvious; when the pH is original or acidity, the effect differed not obvious.2. Disposed simulated absorbing acetone, ethyl acetate and xylol wastewater with lab-scale UASB-Biological Contact Oxidation technology, investigated the treatment effect; Studied the running state of UASB and Biological Contact Oxidation reactor respectively and the characteristic of the particle sludge. The results showed follows.First, After operated 197 days, absorbing wastewater which initial COD is 7550mg/L, the COD remove ratio reached to be 72% after UASB, COD remove ratio reached to be 99% after Biological Contact Oxidation pond. This moment, Nv of UASB reached to be the biggest,2.06 kg COD/(m3·d), Nv of Biological Contact Oxidation pond reached to be 1.35 kgCOD/(m3-d).Second, Running state:The VFA/BA chaned between 0.03 and 0.28 in UASB Reactor, had rather buffer ability, pH was between 6.5 and 7.8, water temperature in UASB was 0-3℃higher than inflow; pH was mainly between 6 and 8 in Biological Contact Oxidation pond.Third, Granule sludge characteristic:VSS/SS was increasing with domestication process, roportion of the big granule sludge was increasing too. At the end of the domestication, VSS/SS was 0.6, grain size which was bigger than 2mm occupied 3%, grain size which was smaller than 0.1mm occupied 52% in sludge bed area; VSS/SS was 0.55, grain size which was bigger than 2mm occupied 1%, grain size which was smaller than 0.1mm occupied 75% in sludge suspension area.Fenton oxidation had good pretreatment effect for absorbing wastewater, UASB-Biological Contact Oxidation technology had good effect during the Nv scop. At present this type research was not so many, so this study had theory and reality meaning.