In this paper, we propose an industrial symbiosis network equilibrium model by using
nonlinear complementarity theory. The industrial symbiosis network consists of industrial
producers, industrial consumers, industrial decomposers and demand markets, which imitates
natural ecosystem by means of exchanging by-products and recycling useful materials
exacted from wastes. The industrial producers and industrial consumers are assumed to be
concerned with maximization of economic profits as well as minimization of emissions. We
describe the optimizing behavior, derive optimality conditions of the various
decision-makers along with respective economic interpretations and establish the nonlinear
complementarity model in accordance with the industrial symbiosis network equilibrium
conditions. Based on the existence proof of the corresponding nonlinear complementarity
model under reasonable assumptions, two groups of numerical examples are given to
illustrate the rationality as well as the effectiveness of the model.