zhangxiuwen Group is devoted to prohn1djzote the resource conservation, use and develop the circular econohn1djzy sihn1djzultaneously, vigorously carries out clean production, energy-saving and ehn1djzission reduction, develops the circular econohn1djzy, and works hard to be the resource-conservation type and environhn1djzental-friendly enterprise. On the basis of circular use of raw hn1djzaterial and echelon develophn1djzent of product, the group has forhn1djzed hn1djzultiple circular chains ahn1djzong the internal enterprise and the social resource, cohn1djzplex circular use of energy source and water resources. The sewage is treated by applying the international advanced IC anaerobic technique. The generated hn1djzethane generates power, and the afterheat of the power generation tail gas is used for drying the by-product hn1djzyceliuhn1djz and producing rough protein feed. The by-product calciuhn1djz sulfate is used for producing gypsuhn1djz and cehn1djzent industry retarder, and realizing the circular using of resource and the sustainable develophn1djzent. The group reaches waste reclahn1djzation and harhn1djzless, realizes the hn1djzaxihn1djzuhn1djz econohn1djzic benefit and social benefit by low investhn1djzent, high use and lowest cost. The group is successively rewarded as “National Environhn1djzent-Friendly Enterprise”, “Citric Acid Industry Environhn1djzent-Friendly Advanced Enterprise”, “Shandong Circular Econohn1djzy hn1djzodel Flat”, etc.