Waste Management Waste Heat Evaporator for RO Reject Management Bosch Limited Nashik Plant

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1 1 Waste Management Waste Heat Evaporator for RO Reject Management Bosch Limited Nashik Plant Background Need for the Project Requirement of low cost & optimized solution for RO reject handling Trigger for the Project Recycling of Treated Industrial effluent and reuse in process Uniqueness of the Project For the first time wetting problem faced in Membrane distillation was solved with coated s Milestones & Date of Commencement Lab Trials (June 2016), Pilot Plant Trials (Aug Oct 2016) Membrane Coating (2Q 2017) Operation of WHE with coated (Aug 2017) 2 1

2 Benefits of WHE Waste Heat Evaporator (WHE) Waste Heat Evaporator based on Membrane Distillation. Low cost alternative to conventional MEE for RO reject handling Waste Heat Evaporator (WHE) at Nashik Plant No Boiler Required. Hot water temperature 70 C. Less Operation & Maintenance required as compared to Multi Effect Evaporator. 3 Benefits of WHE Comparison of WHE with MEE Parameter WHE (10 m3/day) MEE (10 m3/day) Tangible Benefits Power Consumption 3.75 KW 17.5 KW Cooling water requirement 4 m3/hr 10 m3/hr Heating media Structural Support Hot water,thermic Fluid, or any waste heat Intangible benefits Structural supports are not required as system is skid mounted Needs 7 bar Heavy Structural support Corrosion Not affected by corrosion Susceptible to corrosion Safety in operations Runs at lower temperature & ground level Runs at higher temperature & at elevated heights Area required 8 mtr x 4 mtr x 4.5 m Height 8 mtr x 4 mtr x 13 mtr height 4 2

3 Replication Potential within Bosch Waste Heat Evaporator can be used for ZLD solution for manufacturing locations across Bosch Handling very high TDS effluents Info Sharing in Senior Leadership Bosch India (22 nd Nov 2017, Bangalore) 5 Replication Potential Other Industries Waste Heat Evaporator can be used for ZLD solution for manufacturing locations across other Industries Handling very high TDS effluents Info Sharing to other Industries in NIMA Index 2018 (May 6 3

4 Challenges Faced The biggest challenge face was due to Wetting of Membrane. 7 Results of WHE - Benchmarking Wetting of Membranes Lab scale trials Pilot plant trials Large scale setup Sr. No Trials description Status Result Remarks 1 High TDS waste water to be feed to WHE Over TDS: ppm, Oil & Grease: 47.4 ppm Surfactant: 8.02, 3.18 ppm 2 Nitrite batch sample Over 3 PICSAL batch sample Over 4 Feed from all stream to be tested with RO + WHE Over 5 Al trials WHE reject s mixture Over TDS: 8904 ppm, Oil n Grease: BDL, Surfactant: 8.19 ppm TDS: 6013 ppm, Oil n Grease: BDL, Surfactant: 9.00 ppm Total 7 lot of RO3 reject taken to cater all stream Surfactant: 1.32 to 8.37 ppm Oil & Grease: 2000 ppm Surfactant: 800 ppm 8 4

5 Priority Plans Agitated Thin Film Dryer For drying reject from WHE. Waste Heat from ATFD to be used in WHE Connected Treatment Facilities (ETP & STP) Implementation of I 4.0 for all treatment facilities 9 Top Ten Best Practices Ozonation as Tertiary Treatment Automation in Treatment Facilities STP, UF, ETP Real time monitoring based on required parameters Energy Efficient treatment facilities Connected Treatment Facilities 10 5

6 Learnings from Projects Parameters like Surfactant causing foam built-up is an important aspect which needs to be considered during plant design. Use of specially coated to avoid wetting of s. Membrane clogging can be prevented with proper pre-treatment. High TDS containing effluents can be directly fed to WHE with minimum pre-treatment. 11 6