Mass flow-based controls with solids measurements reduce sludge handling costs   Heli Karaila Valmet Suleyman Gemici Valmet Lauri Valtiala Tampere Water 15.04.2016

Valmet in brief Valmet’s unique offering : Process- technology Valmet is the leading global developer and supplier of technologies, automation and services for the pulp, paper and energy industries. Our 12 000 professionals around the world work close to our customers and are committed to moving our customer’s performance forward – every day. Valmet’s net sales in 2016 were approximately EUR 2,9 billion, Valmet’s head office is in Espoo, Finland and its shares are listed on the Nasdaq Helsinki Ltd. Valmet’s unique offering : Process technology, Automation & Services Customer Process- technology Luvut Prospectuksesta ENE oli sisällä Selkeytetty alaotsikko Asiakkaiden lukumäärä sama kuin viime vuonna Services Automation 2017 © Valmet |

Valmet Automation business line overview Extensive range of process automation and information management solutions to take our customers’ business performance forward Global network of expertise close to our Customers Strong R&D investments across the automation offering The Valmet Automation business serves customers in pulp and paper, wastewater and other process industries, power generation and marine . Global market leader with #1 market position in pulp and paper Industry-leading product portfolio Comprehensive services Figures 2015 Net sales EUR 309 million Orders received EUR 309 million Employees 1,600 Automation 1,600 automation professionals > 500 services engineers 450 own operations people Luvut Prospectuksesta ENE oli sisällä Selkeytetty alaotsikko Asiakkaiden lukumäärä sama kuin viime vuonna 2016 © Valmet | Automation Business Line

Tampere Viinikanlahti wastewater plant Finland Tampere Viinikanlahti wastewater plant treats municipal and industrial wastewater 70 – 80 000 cubic meter daily There is produced about 25 000 cubic meter sludge yearly based . The dewatered sludge is used in agriculture, landscaping, road bank covering, and landfill sites. The process has mechanical, biological and chemical treatment phases Biogas of the 2 digesters is used as electricity in the plant 22 September, 2018 © Valmet | H.Karaila / Case Tampere Water Viinikanlahti Finland

Based end customer feedback laboratory measurement is not enough Quality control of centrate water based on infrequently taken lab samples is not adequate mg/l Valmet LS Laboratory Lab sample represents centrate quality at that specific moment: - After a half an hour the situation can be completely different! mg/l Valmet LS Laboratory Valmet LS Laboratory ©Valmet

Tampere Water Viinikanlahti wastewater treatment plant with Valmet’s solids measurement (TS, LS and DS) locations and Valmet SDO 22 September, 2018 © Valmet | Author / Title

Valmet SDO project started autumn 2015 Valmet SDO with Valmet TS, Valmet LS and Valmet DS measurements Viinikanlahti wastewater plant ordered Valmet SDO , sludge dewatering optimizer autumn 2015 for one of their centrifuge. In the same time the plant wanted to optimize also primary sludge pumping as well the sludge feed to the digester based on solid measurements At the centrifuge end customer wanted specially to minimize centrate solid amount and also the dry cake solid amount should be in the optimized level in order to minimize the transporting costs. Also polymer selection and optimizing of the polymer usage was one target value. The project started September 2015 and end customer accepted the delivery January 2016 22 September, 2018 © Valmet | H.Karaila / Case Tampere Water Viinikanlahti Finland

Valmet SDO, Sludge Dewatering Optimizer Centrifuge application Centrifuge: Removes solids from water by way of centrifugal force. The Dry Cake target value varies but usually cake solid is in the 12– 35% range. It is important that the Dry Cake solid amount as high as possible in order the transport costs and incineration costs are optimized Reject water / Centrate solids amounts needs to be minimized in order the material is not circulating inside the plant and cause capacity as well polymer and dewatering costs . The centrifuge controllable variables are torque of centrifuge polymer dosing Centrifuge depended items are max massflow, sludge consistency and volumetric flow to the centrifuge What kind of and how many dewatering units end customer has ? How end customer control the dewatering process ? How end customer control the polymer amount ? Torque control of the centrifuge ? 22 September, 2018 © Valmet | H.Karaila / Case Tampere Water Viinikanlahti Finland ©Valmet

Total solids measurements portfolio Valmet TS Total solids measurements portfolio Valmet Total Solids Transmitter, Valmet TS, microwave based measurement for Measuring Total solids 0…40 %TS (vs. opticals 0…4%TS) sludge sedimentation, digestion, fermentation sludge pumping and treatment applications dewatering, preheating chemical dosing (polymer) dry cake transporting costs, incineration Valmet Low Solids Measurement, Valmet LS, LED based measurement for Measuring Total Suspended Solids 0…0,5 %TSS Optimizing selection of correct polymer type polymer dosage centrifuge capacity and runnability internal solids cycle management of the plant Valmet Dry Solids Measurement, Valmet DS, microwave based measurement for Measuring Total Solids 15…35 %TS Dry cake transporting costs, incineration Valmet LS Valmet DS

Modular Application structure SLUDGE DEWATERING APPLICATION Centrate value feedback + polymer optimization Sludge dry mass feed to centrifuge Dry Cake TS control Torque Polymer Flow Sludge feed flow The application structure is modular. It is possible to go on steps by step. This is how the whole application scture looks like. The centrifuge process is controlled with the inlet mass flow to the centrifuge as well as centrate and dry cake values are optimized. Inputs Values: Valmet TS before the centrifuge Flow measurement before the centrifuge Valmet LS at the centrate, Valmet TS at the dry cake Output values: Polymer setpoint Torque setpoint Sludge feed flow setpoint 15.04.2016 ©Valmet

Centrate TSS Dry Cake TS interactions Manipulated variables Polymer Torque Centrate TSS Controlled variables Dry Cake TS Difficult to control with separate loops , easy with Valmet SDO MPC technology 15.04.2016 ©Valmet

Valmet SDO / Example of the operator display 15.04.2016

In one year of operation, the measurements and control have proved to be very reliable Valmet TS Valmet LS Valmet DS 15.04.2016

More than 140,000 €/year savings  Sludge pumping from clarifiers reduced from 76 m3 to 50 m3 an hour Reduced excess water to thickening Energy savings are approx. 37 %, 5,000 €/year Digester solids increased from earlier 3.5% to 5% 32 % less sludge to treatment Increased biogas production Solid content of centrate water is now 50 % lower and more stable Polymer consumption has decreased almost 40 % from level 8 kg/ton Savings with less material circulated, 10,000 €/year Polymer savings, 49,000 €/year  Easy to dopolymer tests Dried cake solids content has increased by about 1-2 % from 29,7 % to over 31% Saving in transportation costs approx. 80,000 €/a 15.04.2016