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Waste Water treatment world pulppaper84 the pulp and paper industry is facing tighter regulations for wastewater discharge and harsher penalties for violations Figure 5. FennoDose controller is designed to give optimal dosing of process chemicals and ensuring optimal process efficiency to be more cost efficient. Polymer products used in these applications must be both cost efficient and show good robust performance in high solids high alkalinity and high conductivity environments. solution New FennoPol polymer grades were developed in order to secure optimal performance under demanding conditions. FennoDose controllers and online sensors were installed on the most critical sludge dewatering applications. results Process runnability has been excellent from the start Sludge handling capacity and solids removal increased in most applications Improved or sustained runnability Improved sludge dewatering capacity Reliable planning of chemical costs consumption Increased operator understanding savings Implementation of FennoDose controllers has reduced the consumption of sludge dewatering chemicals by 20-30 . summary Across a world where clean fresh water is becoming increasingly scarce the pulp and paper industry is facing tighter regulations for wastewater discharge and harsher penalties for violations. To continue operating cost effectively both with respect to plant operations and possible financial penalties combined chemicals and biological methods are simultaneously being used. These should be complemented with modern tools for optimised chemical usage and efficient WWTP operation efficiency. Kemiras deep experience and know- how in wastewater treatment makes it well positioned to support pulp and paper mills with chemicals methods and tools to meet these challenges in the most cost-effective and efficient manner. references 1. Discharge Standard of Water Pollutants for Pulp and Paper Industry National Standard of the Peoples Republic of China GB3544-2008 2. IPPC Best Available Techniques Reference Document for the Production of Pulp Paper and Board Final Draft July 2013 3. EPA 40 CFR Parts 63 261 430. Federal Register Vol 63 No 72 4. Jenkins D. Richard M. and Daigger G. 1993. Manual on the causes and control of activated sludge bulking and foaming. 2nd edition Lewis Publishers. 5. Stabilisation of Activated Sludge Characteristics by Addition of an Iron Compound IWA Forest Industry Wastewaters Proceedings Seattle 2003 6. Rnnbck M. and Papin E 2013 saving energy in waste water treatment. Pulp and paper logistic volume 3 18 28-29 solution The mill instead decided to invest in low energy tertiary treatment with the latest DAF Dissolved Air Flotation technology. Kemira proposed using cost efficient inorganic precipitation products FennoFloc A and FennoPol K polymer. results New treatment capacity reduced the discharge values to recipient Total COD reduced by 70 colour by 95 suspended solids by 95 nitrogen by 60 and phosphorous by 90. Additionally residual bacteria heavy metals and chelating agents were reduced. savings Mill could continue running the existing aeration plant thus avoiding heavy investments to rebuild the aeration step into active sludge technology. OPtimisatiOn anD COntrOL Overdosing of coagulation or flocculation chemicals due to process variations in effluent treatment is very common Figure 5. This normally results in higher operating cost or calls for tighter manual control. Over the past 10 years in collaboration with pulp and paper industry partners Kemira has developed FennoDose controllers to give greater cost efficiencies in different applications where coagulants and flocculants are used. These include raw water process water sludge dewatering and effluent treatment. sLuDGe DeWaterinG Sludge dewatering where the incoming sludge is varying in both composition and solids content is a good example of where the FennoDose controller is a very cost effective solution. Sludge can include various types i.e. debarking sludge RCF and DIP sludge coating colour sludge and sludge from the effluent treatment plants primary sludge biological sludge chemical sludge and sludge mixtures. Case stuDy FennoDose Cost effective handling of sludge residuals Grade RCFDIP packaging board Challenge Mill group in a corporation needed to upgrade their off machine process efficiency for sludge handling