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Seeking Sustainability: Multiobjective Evolutionary Optimization for Urban Wastewater Reuse in China
journal contribution
posted on 2014-01-21, 00:00 authored by Wenlong Zhang, Chao Wang, Yi Li, Peifang Wang, Qing Wang, Dawei WangSustainable design and implementation
of wastewater reuse in China
have to achieve an optimum compromise among water resources augmenting,
pollutants reduction and economic profit. A systematic framework with
a multiobjective optimization model is first developed considering
the trade-offs among wastewater reuse supplies and demands, costs
and profits, as well as pollutants reduction. Pareto fronts of wastewater
reuse optimization for 31 provinces of China are obtained through
nondominated sorting genetic algorithm trials. The control strategies
for each province are selected on the basis of regional water resources
and water environment status. On the national level, the control strategies
of wastewater reuse scale, BOD5 reduction, and economic
profit are 15.39 billion cubic meters, 176.31 kilotons, and 9.68 billion
RMB Yuan, respectively. The driving forces of water resources augmenting
and water pollution control play more important roles than economic
profit during wastewater reuse expanding in China. According to the
optimal allocations, reclaimed wastewater should be intensively used
in municipal, domestic, and recreative sectors in the regions suffering
from quantity-related water scarcity, while it should be focused on
industrial users in the regions suffering from quality-related water
scarcity. The results present a general picture of wastewater reuse
for policy makers in China.