Study On Adsorption Of Cu And Cd With Residual Sludges

Activate sludge process is one of the most used wastewater treatment technologies. However ,excessive sludge production always troubles engineers. Waste activated sludge have high-yield ,contain high concentrations of metal-ion and other harmful material ,can not be reject randomly. How to economically dispose and utilize sludge is widely focused at home and abroad.Sludge character, economic feasibility determine sludge disposal .The common methods is not perfect because of some causes. Other disposition methods solving excess sludge productions is a subject.The heavy metals wastewaters is the one of environment pollution. It is well recognized that heavy metals in the environment is not decomposed and can be detrimental to a variety of living species, including man. The methods which have been used to remove 1-100ppm heavy metal ions have been found to be limited, since they often involve high capital and operational costs or impurity in sludge interfere handle the result .It is the important problem in the treatment of environment pollution that the concentration of heavy metal accrod with the emission control criterion.The use of microorganisms as biosorbents for heavy metals offers a cheap biomaterial ,and be more effective and rapidity for the treatment low pollutant concentrations.The biosorption is well recognized,as a new technique for the treatment of low pollutant concentrations ,because has distinct advantages over the conventional methods: the low cost,more effective,extensive pH and temperature. Biosorption for heavy metal pollution was widely studied oveseas. The waste actibated sludge was produced by municipal sewage treatment plant when it cleans sewage ,and have high-yield and requie high handle cost. Residues sludges adsorb heavy metal is a good approach,which the method of obtain better economic and environmental benefits. Decreasing pH or microbiological leaching can regenerate absorbents.Biosorption of heavy metals using residues sludges has been suggested as a method to effectively treat metal containing wastewater. Compared with conventional methods, biosorption offers certain advantages, such as abundant and inexpensive source, low capital investment, low operation costs ,especially a new approach for sludge using . Deep study in the range may be more significative.Recently ,the studies on biosorption for metal-ion are focused on biomaterial uptakeing metal cation ,the industrialization of absortion operational process still need more research in the lab and simulative industrial operation.This paper discussed feasibility of the technique that four residual sludge cleaning different sewage as biosorbent uptake heavy metal-ion in the sewage,and determine which sludge is fit for biosorbent. Practical industrial sewage always contain several kinds heavy metal-ions,such as Cu2+ and Cd2+.This paper is summarizes that four residual sludge cleaning different sewage in the Changchun and Jilinshi ,absorb mono-element Cu2+ and Cd2+ .This study aimed at doing some absorption experiment in the laboratory in order to compare the uptake capacities of different sludge on low concentration Cu2+,Cd2+. Factors having effects on the metal uptake process ,such as pH,temperature,,the quantities of sludge ,absorption time ect.,are discussed in detail.The result indicate that all of the sludge can absorb mono-component Cu2+,Cd2+ .The order of the metal uptake abilities is Jihua sludge cleaning industrial sewage > Dacheng sludge > Jihua sludge cleaning living sewage > Qichechang sludge.Qichechang sludge is not chosen as sorbent because the efficiency of absorption is low and sludge include plentiful heavy metal. Jihua sludge cleaning industrial sewage is alkalescent and be chosen as precipitator ,which deposit Cu2+,Cd2+.Dacheng sludge and Jihua sludge cleaning living sewage may be chosen as sorbet.In the same condition ,the absorption efficiency on Cd2 of Dacheng sludge is more 30% than the same concertration Cu2.T...