| Usymmetrical Dimethyl hydrazine(UDMH) wastewater treatment is a worldwide problem,especially in the spaceport,where discharges a large amount of wastewater.There are many treatment methods in the literature,but no one can be used to the practice.Russia's space agency and NASA treated with burning and natural decomposition method.This paper use chemical oxidation method and physical adsorption to duel with UDMH hydrazine wastewater,studied the various affecting factors,analyzed the treatment effect,after the small-scale test we did the preliminary process design.Potassium permanganate,hydrogen peroxide and sodium hypochlorite is used in chemical oxidation of UDMH.With 0.01 mol/L KMnO4.the wastewater of 6.6%and 1‰can be oxidized completely,but it a lso produce a lot of toxic pollution and easy explosion.H2O2 could not oxidize dimethyl hydrazine completely.NaCIO can oxidize UDMH,but produce more intermediate,especially formaldehyde.This needs a second oxidation.Physical adsorption method is adopted the activated carbon adsorption.Adsorbent with 20-40 mesh of coal powder activated carbon,which has been modified by sodium dodecyl benzene sulfonate surfactant.The 1 h static adsorption capacity is 100 mg/g,and the dynamic adsorption capacity is 35-40 mg/g.This method is effect and after treatment,the wastewater can reach the discharge standard of 0.5 mg/L.the performance drop of regenerated activated carbon is not significant.But it is difficult to stripping.It needs a temperature of 220? to stripping,and using more energy and large stripping equipment.The experimental results show that,when the wastewater disposal volume is 10 m3/h,liquid velocity in adsorber is 4 BV(m3/t·h),the mass of activated carbon is 2.5 t,volume is 4 m3. |
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