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首页> 外文会议>International biohydrometallurgy symposium >Sulphate reduction optimization in the presence of Desulfotomaculum acetoxidans and Desulfobacter postgatei species. Application of factorial design and factorial correspondance analysis methods
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Sulphate reduction optimization in the presence of Desulfotomaculum acetoxidans and Desulfobacter postgatei species. Application of factorial design and factorial correspondance analysis methods

机译：硫酸盐还原优化在脱硫酰氧氮的存在和后脱硫后脱硫。因子设计与阶乘相应分析方法的应用

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The "green acid process" leads to the production of large quantities of phosphogypsum solid waste. In Morocco, this waste is rejected at sea, contributing to the pollution of the environment. One of the main objectives of the present study is to develop an integrated biological process for the production of sulfur from phosphogypsum, comprising a biological sulfate reduction step. This paper presents the results of sulphate reduction rate optimization studies in the presence of Desulfotomaculum acetoxidans and Desulfobacter postgatei species. The experimental work was carried out according to the method of factorial design, and the results were analysed according to a factorial correspondence analysis technique. Four factors were studied, i.e., the initial sulphate and acetate concentrations ((SO_4)_i, (Act)_i), and the initial pH and incubation temperature (pH_i,T_i). Three response-variables were determined: the maximal average sulphate reduction and sulphide production rates and the final pH. These studies show that for Desulfotomaculum acetoxidans (i) optimum bacterial growth and optimum sulphate reduction are obtained for pH range from 6.6 to 7.6 and T_i range from 30 deg C to 40 deg C (ii) optimum initial concentrations range from 7.75 to 17.25 mM for sulphate and from 10 to 20 mM for acetate (iii) strong inhibitions occur respectively below pH_i= 6.1, above pH_i= 8.1 and above T_i = 45 deg C (iv) Strong inhibitions are obtained below 3 mM and above 22 mM for sulfate and below 5mM and above 50 mM for acetate. For Desulfobacter postgatei (i) optimum bacterial growth and optimum sulphate reduction are obtained for pH_i range from 6.2 to 8.4 and T_i range from 25 deg C to 35 deg C (ii) optimum initial concentrations range from 10 to 22 mM for sulphate and from 12.5 to 27.5 mM for acetate. (iii) strong inhibitions are obtained respectively above pH_i= 9.5 and T_i- 40 deg C and below pH_i=5.1 and T_i= 20 deg C (iv) strong inhibitions are obtained below 4 mM and above 28 mM for sulfate and below 5 mM and above 45 mM for acetate.
机译：“绿酸过程”导致生产大量磷酸缺口固体废物。在摩洛哥，这种废物在海上被拒绝，有助于环境污染。本研究的主要目的之一是开发磷酸缺口生产硫的综合生物学方法，包括生物硫酸盐还原步骤。本文介绍了脱硫乙酰氧酰胺和脱硫后硫酸盐氧化物和脱硫后硫酸盐还原率优化研究的结果。根据因子设计方法进行实验工作，并根据阶乘对应分析技术进行分析结果。研究了四种因素，即初始硫酸盐和醋酸盐浓度（（SO_4）_I，（ACT）_I）和初始pH和孵育温度（pH_i，T_I）。确定了三个响应变量：最大平均硫酸盐还原和硫化物生产率和最终pH值。这些研究表明，对于乙酰氧毒性（I），最佳的细菌生长和最佳硫酸盐还原在6.6至7.6和T_I的范围内得到30℃至40℃（II）的最佳初始浓度，范围为7.75至17.25mm。硫酸盐和乙酸盐（III）的10至20mm的强烈抑制分别在pH_i = 6.1以下发生，上述pH_i = 8.1且上述T_I = 45℃（iv）在3mm且高于22mm的硫酸盐中获得的强抑制，用于硫酸盐和下方。乙酸盐5mm和50 mm。对于PH_I的PH_I，从6.2-8.4和35℃（ii）的最佳初始浓度为硫酸盐的最佳初始浓度为6.2至8.4，T_i的温度范围为5.2至35℃（II）的温度范围，为脱硫（I），从6.2至8.4和35℃（ii）的最佳初始浓度为硫酸盐的最佳初始浓度为50至22mm。乙酸盐27.5毫米。 （iii）分别获得的强抑制分别在pH_i = 9.5中获得，并且T_i-40℃并低于pH_i = 5.1和T_i = 20℃（iv），得到低于4mm且高于28mm的强抑制，用于硫酸盐，低于5mm，乙酸盐以上45毫米。

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