Study On Adsorption Efficiency Of Heavy Metals And Bio-oxidation Of Hydrochloric Acid Pickling Waste Liquor By Acidophilic Microflora

In order to improve the biological oxidation of the steel hydrochloric acid wash waste, and achieve the processing of heavy metal waste water with resources, reduction, harmless.It is more difficult for Fe2+to be biologically oxidized in the hydrochloric acid pickling waste liquor because of the characteristics of low pH and high concentrations of Cl-. This paper focus on the bio-oxidation possibility of Hydrochloric acid pickling waste liquor by acidophilic microflora. The critical condition of bio-oxidation of Pickling Waste Acid Liquor is determined to be pH≥1.4, Fe2+≥0.04mol/L, by examining the trends of the process of the oxidation of the Fe2+oxidation rate in Hydrochloric acid pickling waste liquor. And the Cl-would slow down the oxidation rate of Fe2+in the bacterial suspension when its concentration is greater than47.6mg/L; the value of pH is a key factor to the biological oxidation of Hydrochloric acid pickling waste liquor. The evolution of the community structure of Pickling Waste Acid Liquor show that it has less influence on microflora structure with the increase in the proportion of hydrochloric acid pickling waste liquor and its structure changes little, but the amount of dominant bacteria were significantly reduced in the bio-oxidation process.It was discovered by the tolerated experiments of heavy metals that the bacteria could be withstand at least the concentration of300mg/L,1000mg/L and200mg/L for Cu2+、Zn2+、Cd2+. And the study from the adsorption of heavy metals in logarithmic phase have shown that the maximum adsorption rate of Cu2+、Zn2+、Cd2+was84.52%、98.84%、78.74%. Thus it is proved that it exists obvious adsorption effect of heavy metals by the flora in the logarithmic phase.From the adsorption erperiments in the stabilization period, it shows that the the adsorption of heavy metals significantly is lower than logarithmic phase, and the maximum adsorption rates is28.72%、34.14%、55.46%for Cu2+、Ni2+、Cd2+, and it has no almost adsorption effect for Zn2+. The analysis from sediment which adsorbed of Cu2+、Ni2+、Cd2+and Zn2+shows that the peak shape changed little, but the adsorption peak of1427-1cm disappeared after adsorped Cu2+、Zn2+. The analysis investigated by XRD shows that the crystal sediments change little after adsorped Cu2+、Ni2+、Cd2+, in addition to zinc. Element containing Cu、Zn、Ni were discovered in the surface of the adsorption from the sediment through the SEM-EDS scan. The results show that, it provide a new direction for bio-resource utilization of heavy metals and the hydrochloric acid pickling waste liquor by acidophilic microflora.