Composite Function Of Bacteria In Processing V <sub> 2 </ Sub> The O <sub> 3 </ Sub>, V, Cr Wastewater Applied Research

With development of industry, it becomes more and more serious of water pollution, and so more advanced technology are demanded to deal with waste water. As one of newly developed technology, microbe adsorption technology has a good application in dealing with heavy metal ion waste water because of its much germ species, low investment and cost, simple operation, good selectivity, fast velocity of dealing with waste water and no secondary pollution etc.Acidity industrial waste water with high concentration of V(24.4—400 mg/L), TCr (212～800mg/L)heavy metal ions has been produced during vanadium production. As for this kind of waste water, some traditional technologies are now be in use such as neutralization-precipitation method which, however, has some defects such as complex techniques, equipment to be eroded easily and much residue produced during chemical reaction. At the same time, this technology has high cost(its expense ≥ 10RMB/m³). Consequently, it is a must to find a new technology to deal with V/waste water.Firstly in this paper some main methods to be used to deal with heavy metal waste water have been compared, and secondly much experiment with composite functional germ has been done, in which effect on microbe adsorption of breed of composite functional germ, proportion of germ to liquid, reaction time, pH value, temperature, age of germ and precipitate time are discussed.The experiment results reveal that it is feasible for composite functional germ to deal with V, Cr heavy metal ions in V₂O₃ waste water. The optimal values that composite functional germ 3 days adult, reaction temperature less than 50℃, pH value less than 4, proportion of germ to liquid 1:10, rotate speed of mixing round 40r/min, reaction time 15min, precipitate time 90min are determined, with which eliminating percentage of Cr, V are higher than 99.9% and the waste water after dealt has 0.12 mg/LCr, 0.01 mg/LV, 7.2 pH value. The water quality indicators are eligible by national standard for compositive discharge of sewage. At the same time, composite functional germ may reduce Cr(VI) and as a result the bulk of Cr ion in water presents in form of low chemical value, only 3.13% Cr(VI).The laboratory experiment optimal values has been supported by the pilot-scale results with eligible discharging concentration of TV, TCr and Cr(VI) with TCr≤650 mg/L, TV ≤450 mg/L in original waste water and simultaneously pH value may self-regulate to 5.0-6.5, which indicate that composite functional germ adsorption is a reliable and stable technique. In addition, direct cost by microbe method is 5.43RMB/m³, which is lower than traditional methods of 10 RMB/m³.In order to avoid secondary pollution, this sullage has been analyzed and corresponding advices have been supposed. The analysis results reveal that average concentration in dried sullage is 2.84% of TV, 4.65of TCr and minim of other metal ions. V and Cr can be reclaimed by chemical methods treatment because of simple sullage component. According to calculation, 50RMB of income would be got through V reclaimant per stere waste water and then notable economic benefits.