| With the expansion of the reclaimed water supply network application scope and scale, the key problem that restricts the development of the reclaimed water supply network appears constantly. The optimization design of reclaimed water supply network is one of the important aspects. At present optimization design of reclaimed water supply network only considers cost and hydraulic reliability factors, ignores water quality reliability and environmental factor. That lead to waste energy, and water quality of the end of the user is not ensured, and environmental benefit is reduced.Therefore, there are cost, water quality reliability and greenhouse gas emissions to be considered. The main research content is as follows:First of all, optimization design model of water supply network at home and abroad is introduced. which has the following Characteristics: the development process of optimization design model is from the single objective to multi-objective, from tree water supply network to annular water supply network, from linear to nonlinear,from static to dynamic. Secondly, the multi-objective optimization design model of reclaimed water supply network is set up, which includes three objective functions namely cost, node relative water quality entropy and greenhouse gas emissions. The meaning of the three objective functions is introduced respectively. The constraint conditions are determined, which are head loss, flow rate, pipe diameter and node continuity equation. The third, the algorithm of multi-objective optimization design model is introduced, which includes conventional algorithms and intelligent algorithms.Conventional algorithms include the enumeration method, the mathematical programmin g method, etc. Intelligent algorithms include simulated annealing algorithm, particle swarm optimization algorithm, ant colony algorithm, hybrid leapfrog algorithm, multiobjective harmony search algorithm, etc. The meaning and application of all kinds of algorithms are respectively introduced. The strength Pareto algorithm is introduced mainly. Finally, The strength Pareto algorithm is applied to a reclaimed water supply network of plain area in north China. The reclaimed water supply network is optimized based on the MATLAB and EPANET. The optimization results are chosen by comparison. |
