Electro Bioremediation Of Metal-laden Organic Wastewaters And Simulations Of Biofilm Structure & Biosorption

Electro biotechnology as an environment-friendly technology shows potential values in the field of environment pollution treatment. It is necessary to carry out extensive research theoretically and practically.A novel combined process of micro electrolysis and biofilm is initially put forward and utilized to purify metal-laden organic wastewaters in this article. Two key factors to achieve this aim are to screen the qualified functional bacteria and determine the optimum electro deposition potential of metals on the premise of physiological and biochemical activity sustained. The main content in this article are as follows: TEM and SEM Analyses of mixed microbial cells show that: after acclimation by heavy metals or non-degradation organic substances, small sorts of mixed microbial are survived, and adaptable individuals are increased obviously. Moreover, their microstructure and morphological characteristics are changed greatly. Biodegradation kinetics indicates that glucose can be degraded to much lower levels by mixed microbial cells cultured or acclimated, but the curves of specific degrading rates are quite different.Polarization phenomena of metals electro deposition are studied in both theory and experiments, and the reductive peak potentials of metals are also determined. Continuous treatments of metal-bearing organic wastewaters by combined process were carried out in this article, and its purification efficiency is obviously prominent than that of sole electro deposition or biofilm processes. A combined method of discrete-differential is used to dynamically simulate biofilm formation and development in 2-D space, and the morphological characteristics of biofilm are output values of model. Further, the effects of model parameters on biofilm microstructure are investigated, too. A model of metal ions transfer and biofilm adsorption under direct-current electric field is established and tested with the experimental results. Moreover, the effects of electro migration velocity, initial concentrations of heavy metals and wastewaters maximum input velocity on the equilibrium adsorbance are also studied deeply.