The Treatments Of Heavy Metals Cu²⁺,Pb²⁺ From Water With Acid Disposal In Waste Computers

The Heavy metal waste water containing various deleterious metal ions often does great harm to the human and nature environment due to its complex components and great toxicity, and these metal elements could not be degradated naturally by organisms and may be accumulated through the food chain. So it is necessary to conduct intensive research on development of the equipments for removal of deleterious metals from wastewater and related mechanism, and this will be significant to promote the development of cleaner production.The treatment and recirculation of the heavy metal has become a focus subject. Treatment method is very much difference with the heavy metal's source and type and formation. So far people haven't found valid methods to dealing with it completely, not avoiding its pollution. We could only change its place and transform its form of the physics and chemistry with noway of decomposing and destroying it for the waste water of the heavy metal. Thus, the most reasonable principle of treatment is recycling the water and heavy metal, considering realization of zero's pollution and the comprehensive utility of resources.According to metallic characteristics under different pH condition, using lime deals with waste water of computer produce by adjusting pH. All sorts of metallic ion can be turned into hydroxide deposition through taking separating-stage neutralization method and individual step adding reagent. Adding coagulant aid makes the deposit speed quicker and more complete in order to remove the copper and lead ions for being up to draining norms, part of water being recycled as well.The experiments expresses that the optimum condition is as follows: the waste water is reacted by the using 0.2%-0.3% dose of Cu²⁺ deposited reagent for 30 min at room temperature during 688 pH; the using dose of Pb²⁺ deposited reagent is 15%-20% more than the theoretical amount during 8.5-9.5 pH, coagulants such as the appropriate use of high-pricedmolysite FeSO₄; the best coagulant aid is Fe³⁺ salt such as FeCl₃ with the best dose of 10.5mg/L. As a result, the waste water of computer produce can be drained within norms, concentration of Pb²⁺ in water less than 1.0 mg/L.Emulsion liquid membrane, the transfer behavior of Pb²⁺ and Cu²⁺ through the emulsion liquid membrane system of TBP-Span80-atoleine-kerosene was studied. The study analyzed the effect of Pb²⁺ transport rate of membrane phase component, pH values in external aqueous phase, acid ness in internal aqueous phase, rew of metal ions in external aqueous phase. In the case of the optimal technological conditions, the waste water of Pb²⁺ and Cu²⁺ was treated .The results showed that the optimal conditions of transport and separation of Pb²⁺ were volume fraction 5.0%,Span80,volume fraction 8.0%TBP,volume fraction 5.0% atoleine ,volume fraction81%kerosene,H₂SO₄Concentration 1.0 mol/L in internal aqueous phase ,Roi 1.0,Rew 0.2,pH values 3.5-4.0 in external aqueous phase and transfer time of 20 min through the emulsion liquid membrane system of TBP-Span80-atoleine-kerosene.On this condition ,the transport rate of Pb²⁺ could reach 99.4%; separation of Cu²⁺ were volume fraction 7.0% Span80,volume fraction 9.0%TBP, volume fraction 5.0% atoleine ,volume fraction 80% kerosene,H₂SO₄Concentration 2.0 mol/Lin internal aqueous phase ,Roi l.0,Rew 0.25,pH values 4.0-4.5 in external aqueous phase and transfer time of 15 min through the emulsion liquid membrane system of TBP-Span80-atoleine-kerosene.On this condition, the transport rate of Cu²⁺ could reach 99.5%.Treating Pb²⁺ and Cu²⁺ in the waste water could be reduced to 1.0 mg/L, below the demanded disposal standard.