Research On The Trearment Of Regeneration Explosive Paper Wastewater By Coagulation Sedimentation+BIOFOR Process

Recycled explosive paper wastewater mainly comes from Broken dissociation and washing. The main pollutants in water includeing suspended solids, fiber, and chemical substances added in production process. So the characteristics of the wastewater recycled paper is that high concentration of suspended substance, high COD. Its complexity of the components.The subject is studied on the research of one paper company which located in Poyang County of Jiangxi Province. The feature of this recycled paper wastewater is low, but with a high proportion to recycle use in the production.By free dropping experiment, I confirmed that water recycled for pulp wash can use water out of horizontal flow grit chamber. The best coagulation sedimentation conditions were pH in7.0, the coagulant dosage of PAC for200mg/L, rapid agitate strength4min with110r/min,then slow stirring8min with40r/min, sedimentation20min.In this condition, COD removal rate can reach40.8%, SS removal rate can reach91.2%.When used on engineering "coagulation precipitation-aerobic" method, The recycled paper wastewater treatment can achieve very good effect. The best condition is wastewater first be treated by fine rack and horizontal flow grit chamber, in pH was7.0, the coagulant dosage of PAC for200mg/L, rapid agitate strength4min with110r/min, then slow stirring8min with40r/min, sedimentation20min, Then treatment by BIOFOR, The result of this conditions are COD removal rate can reach70.4%, SS removal rate can reach96%. The water treatment by the integrated processes can reach the 《Pulp and paper industrial water pollutant discharge standards》(GB3544-2008) and company requirement.The subject researched the treatment schemes which can treat the recycled paper wastewater achieved the discharge standard, and researched the way how to reuse. At the same time, The subject researched the necessity and significance of wastewater treatment and recycle project, content and construction scale, process technology plan, the construction term and Investment estimation, the estimate of cost, social appraisal and assess benefit of eco-environment projects.