tailieunhanh - Waste Water Treatment and Reutilization 2011 Part 8

Tham khảo tài liệu 'waste water treatment and reutilization 2011 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 178 Waste Water - Treatment and Reutilization GA configuration Variables 9 Population size 11 single strains 12 consortia Generation gap 1 Selection probability Mutation probability Total bits in chromosome 36 Table 2. Parameter settings for the genetic algorithm. The GA used here followed the generational model and had a population size of 11 single strains or 12 consortia . Each solution was represented as a string of 9 values encoding values for variables of environmental conditions. In this way each solution encoded for a specific set of environmental conditions selected in the experiment Table 3 . INITIAL RANGES OF VARIABLES pH - every unit NH4Cl - g L every g NaH2PO4 - g L every g NaHCO3 - g L every g KCl - g L every g Acetate 1 - 10 mM every 1 mM Perchlorate 60 - 400 every 10 ppm Trace minerals 0-10 ml L every 1ml L Vitamins 0-10 ml L every 1ml L Table 3. Ranges of environmental conditions used for the optimization with the GA. The initial population was generated at random. Fitness values were linearly rescaled with Li LI and fmax 0. Roulette Wheel selection was used and no elitism was applied. Single crossover was performed on each pair of selected individuals with probability of per bit. Over the course of eleven generations of optimization using a GA a statistically significant increase in average perchlorate degradation rate by Dechloromonas spp. KJ and Dechloromonas Miss R was observed when optimization of consortia Pl6 and Cw3 resulted in 109 and 143-fold increase in average perchlorate degradation rate Kucharzyk et al. 2011 . The data obtained in this part of GA optimization provided a composition of an optimal medium for maintaining mixed cultures in further analysis and entailed the use of the GA to artificially construct a consortium from 10 isolates such that the consortium is optimized for the reduction of perchlorate in progress . In the next .

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