Study On Heavy Metals Removing Technology Of Polluted Water

At present, the pollution of water's heavy metal cause the attention by us gradually. This also becomes the difficult problem and focus in studying water environmental pollution at home and abroad. Our country is abundant in coal natural resources, which carries out water's heavy metals renovation in cutting coal subsiding area is a new subject.The experiment uses heavy metals chelate agent (NDTC) and the crop seedlings (corn, broomcorn) to wipe off and absorb heavy metals of simulating heavy metals waste water in the laboratory. In order to insure the wipe off rate, NDTC amounts, pH value,precipitayion time and the reaction temperature have been analysed and discussed, the sorption effect to different heavy metal has been inspected of the corn and broomcorn.The result indicates: NDTC is able to wipe off the heavy metals in waste water effectively, and the handling method is simple, deposition steady-going, Cu²⁺, Pb²⁺, Zn²⁺, Cd²⁺ taking off rate average value has all reached 94% in 100 ml of 10 mg/L simulate waste water, surplus thickness all be lowered to 1mg/L, parts for 0.118 mg/L, 0.205mg/L, 0.512mg/L and 0.404mg/L, Cu and Zn get to the country effluent standard, but Pb and Cd approach the country effluent standardthe. NDTC can effectively remove in the waste water the heavy metal, theprocessing method simple, the precipitation is stable ,above the corn and the broomcorn show the different selectivity and otherness to the same heavy metal, the different parts of corn and the broomcorn show the different accumulation effect to the same heavy metal: root>stem> leaf.Canna indica, Cyperus alternifolius, Lythrum salicaria Linn and RooflrisRhizome were selected to make a floating cultivate experiment in order to remove the heavy metals in water, Phragmites australis, Typha latifolia and Hindu Lotus were selected to make a standing cultivate experiment in order to remove the heavy metals in bottom mud. The detect result of heavy metals in plant body show that all the selected plants have the ability to forbear and absorb the heavy metals dissolved in water and bottom mud, Canna indica, Cyperus alternifolius have a good absorb effect than Lythrum salicaria Linn and RooflrisRhizome, Typha latifolia is better than Phragmites australis, Hindu Lotus.The experiment result indicates that the heavy metals which is absorbed by plant mostly reserved in root system, and only a little of the heavy metals is transported to the stem and leaf of the ground parts. The results of the study can carry on in the water body for our country miningarea the metal repair to provide have the actual value the parameter.