Research On Waste Biomass Reuse And Its Application In Treatment Of Low-metal-concentration Wastewater

In this paper, various kinds of waste biomass were tested to find the most powerful one to remove the heavy metal ions from solutions. At the same time, the mechanism of biosorption, the operation parameters, the immobilization method and the desorption method were studied. Moreover, the kinetic equations of the adsorption and desorption process were discussed. In addition, chromatographic effects in the performance of fix-bed reactor caused by different sorption affinities of the metal ions were also investigated. The result indicated that the heavy metal absorption capacity of activated sludge was far higher than the yeast and chlorella. In the Cd2+ adsorption experiment, the adsorption capacity of 8.62mg/g could be achieved by activated sludge. Among all the factors, pH was the most important parameter. All the three biomaterials presented high removal efficiencies of heavy metal ions within the pH range 4.0-5.0. Compared with the other media, the sodium alginate was the most effective. Moreover, the kinetic studies showed the adsorption process and desorption process could modeled by the equilibrium equation. Besides, according to the adsorption performance of the reactor for the mixture of Cu2+, Cd2+and Zn2+, the affinities of metals towards the CA beans decreased in the following order: Cu2+, Cd2+,Zn2+.