الفهرس | Only 14 pages are availabe for public view |
Abstract Wastewater treatment is a process used to remove contaminants from wastewater and convert it into an effluent that can be returned to the water cycle. Once returned to the water cycle, the effluent creates an acceptable impact on the environment or is reused for various purposes (called water reclamation). In fertilizer plants water is used for the removal of dust, cooling tower and industrial process steps. Wastewater treatment is a major problem in such complex fertilizer plant from the environmental pollution point of view . wastewater from chemical fertilizer industry mainly contain organics, inorganic and suspended solids The resulting wastewater contains calcium and sulfate in hazardous forms. Our turn in this research is to remove these ions without interaction between each other to avoid calcium sulfate (CaSo4) formation which causes many problems during its filtration and disposal. To achieve this purpose, we separated the path of industrial wastewater that contains sulfate ions from other that contains calcium ions to prevent the formation of calcium sulfate and several reagents were tested focusing on types of reagent and the resulting effect. Anew chelators were prepared by reaction of ethylene diamine with ethyl acetoacetate, tri-ethyl citrate and di-ethyl oxalate to produce organic chelators rich in oxygen atoms that have a good effect on removing calcium and sulfate ions |