Secondary Pollution Of Heavy Metals In Municipal Sludge Disposal Process And The Preliminary Inquiry Of Plant Enrichment

The contaminated soil from the sludge of the North project are the researchobject in this article. To investigate the influence of simulated acid rain on formtransformation and environmental behaviors of heavy metals.The tested metalsinclude Cr、Cu、Zn、Cd、Pb、Hg was discussed the solution flow, shower leachingtime and the pH value condition. The results showed that the release of Zn with strongsex, and Pb, Cu are relatively stable.This suggested that the leaching wouldn’tsignificantly influence the leachabilities of Cu,and thus， to analyze its higherLong-term accumulated in sludge would be of significance to the environmental andecological pollution.By using the scientific sampling method to collect the soil and water which nearthe Shenyang Northern Sewage treatment plant, by the method of microwavedigestion to deal with soil. With ICP-AES operation the soil and the water samples Cr,Zn, Cu, Pb, Hg, Cd seven metal element’s content. This method not only highsensitivity, little environmental pollution, rapid, the simple but also accuracy. What’smore, it could determine a variety of metal elements. The relative standard deviationmethod are less than3.01%, and the recoveries are in the range of95.32~103.2%.The results found that the land near the sewage treatment plant wascontaminated seriously, including a higher content of Pb, Cd which is key to beremediation of heavy metals. By analyzing the data of the river around ShenyangNorthern Sewage Treatment Plant showed that by the treatment of the sewagetreatment plant, the low heavy metal content of sewage can reach the nationalstandards. In addition, by contrasting the measurement results can be seen that theseasons changing cannot affect the sewage treatment.The experiments on six kinds of crops grown on composted sludge detectionshows that in the process of plant growth, the presence of heavy metals in soil, heavymetal could accumulation in the plant body. The crops have a greater uptake of Zn and Cd, and the other elements absorb smaller amount. Prove to the ground by Zn and Cdheavy metals pollution is more serious, need to focus on governance. Under thecircumstances, the eggplant on the absorptive capacity of the elements are strong,soybeans’ absorption slightly weaker of the various elements. And the crop leaves onthe adsorption of heavy metals is greater than the amount of adsorption of fruits,stems, and roots. By examining the absorption characteristics of heavy metals. On theone hand, to explore the sludge heavy metal migration release law, on the other hand,developed plant crops for enrichment sludge heavy metals. To achieve sludgeharmless, resource, design efficient, green, low cost eco-governance programs.