EFFLUENT REDUCTION PROJECTS SULPHURIC ACID PLANT
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1 EFFLUENT REDUCTION PROJECTS SULPHURIC ACID PLANT
2 BACKGROUND INFORMATION Sulphuric acid plant in Umbogintwini. Double absorption plant, capacity of 550MTPD. Built by Simon Carves in Side stream plants such as: Liquid SO2 Plant, Liquid SO3 and Oleum plant.
3 PRESENTATION OVERVIEW SECTION A Water consumption in acid plant. SECTION B Effluent generation from the acid plant. SECTION C Effluent reduction projects.
4 OBJECTIVES Conduct a total water balance to identify: Projects on sustainable development of water resource, Projects on minimizing water consumption and Projects on minimizing environmentally pollution loading. Reduce the effluent volume hence costs.
5 WATER IS A LIMITED RESOURCE Water of good quality is becoming a scarce resource. Water costs are rising faster than inflation. Discharge standards are becoming increasingly stringent. Treatment costs are rising faster than water costs. Industrial water reuse/recycling is neccessary
6 WATER CONSUMPTION Demin Plant 55% Waste heat boilers Durban Metro Water R6.64/m m3/month Cooling towers 36% Acid dilution 5.7% Sand filter no.1 & 2 Safety showers Other 3.3% Washing
7 EFFLUENT GENERATION SOURCES Demin Plant 49% Heat boilers 20% Cooling system 25% Other 3% Rain Primary effluent plant (9 500m3/month) Separation tank Secondary effluent plant Storm water
8 EFFLUENT REDUCTION PROJECTS (Implemented) Replacing co-current current with counter current demin plant (2007), Automating boiler blowdown system (2007), Optimizing sandfilter backflush system (2005), Re-using the cooling tower blowdown (2006) and Recycling the condensate(2007).. Total expenditure: R3,5m Payback period: 17 months IRR (Nominal): 70% (Real): 61% NPV: R7.96m
9 1. REPLACING CO-CURRENT CURRENT WITH COUNTER CURRENT DEMIN P SHORT COMINGS OF CO-CURRENT CURRENT DEMIN PLANT (i.e. As water quality deteriorates, it underperforms) Feed Water Conductivity (us/cm) Mar-03 1-Jun-03 1-Sep-03 1-Dec-03 Effect of Feed Water Cond. on Demin Plant Run-time 1-Mar-04 1-Jun-04 1-Sep-04 1-Sep-04 1-Mar-05 Date (quarterly) 1-Jun-05 1-Sep-05 1-Dec-05 1-Mar-06 1-Jun-06 1-Sep-06 1-Dec Run-time (hours) Cond Running Time 1. MORE REGENS 2. HIGH EFFLUENT 3. MORE CHEMICALS R/m Mar-03 Demin plant operating cost 01-Jul Nov Mar Jul Nov Mar Jul Nov Mar Jul Nov-06 m Average monthly effluent volume per year R 2,500,000 R 2,000,000 R 1,500,000 R 1,000,000 R 500,000 R 0 CI's effluent cost 2,242,459 1,201,516 1,164,
10 CO-CURRENT CURRENT SYSTEM V/S COUNTER CURRENT SYSTEM A. CO-CURRENT CURRENT SYSTEM Uses regen chemicals less effectively as it comes into contact with heavily saturated resins firsts Feed water Regen chemicals Effluent Water outlet B. COUNTER CURRENT SYSTEM Enables the regen chemicals to contact the least saturate resins first. Regen chemicals Water outlet Feed water Effluent
11 ADVANTAGE OF COUNTER CURRENT OVER CO-CURRENT CURRENT D.PLANT COUNTER-CURRENT CURRENT SYSTEM OVER CO-CURRENT CURRENT SYSTEM 1. Less regeneration chemicals consumption 2. Less effluent generation. 3. Effective resins exchange rate USE OF RIVER WATER 1. Saving feed water cost (R. water: R3.24 & DBN metro water: R6,64) USE OF DEMIN WATER IN REGEN CYCLE. 1. Avoid polluting resin layer & therefore increase in plant run time ADDITIONAL WATER TREATMENT EQUIPMENT 1. Sand-filter: remove Suspended solids from the water 2. Carbon filter: decrease organic loading from the water 3. Degassing tower: removes CO2 from de-cationised water
12 PERFOMANCE COMPARISON PLANT PARAMETERS counter current co- current Effluent generation per year(81%) Electrical consumption per year: Caustic consumption per year:(60%) tons tons Kwh Kwh 55 tons 140 tons Sulphuric acid consumption per year: (67%) 72 tons 221 tons
13 2. AUTOMATING THE BOILER BLOWDOWN SYSTEM Shortcomings of manual over automatic blowdown system. Dumping unnecessary water to effluent, Dumping unnecessary treatment chemicals to effluent and Increases the scaling potential of the boiler tubes. Energy savings from the blowdown effluent
14 Boiler water control: Manual V/s Automatic blowdown system 1. Boiler water TDS trends from manual boiler blowdown system. Manual boiler blowdown for Boiler no.1 (September 2006) Cond (us/cm) Boiler Cond. Setpoint Cond Days 2. Boiler water TDS trends from Automatic boiler blowdown system. Automatic boiler blowdown Conductivitylevel (us/cm) setpoint cond boiler cond Days
15 COST BENEFIT ANALYSIS Component Manual (Per Month) Automatic(Per Month) Savings (Per Month) Effluent Cost R (2628m 3 ) R (203m 3 ) R (2425m 3 ) Chemical Cost R R 376 R4 504 Feed water Cost R (R18/m 3 of Demin water) R R TOTAL R R R86 954
16 Scale formation on the tubes
17 Main causes for the boiler failure Demin plant underperforming resulting in ions slipping (Chlorides, Sulphates, etc) through to the boilers. Demin plant was underperforming due to change in feed water chemistry over the past six years ( Conductivity used to be below 100uS/cm but was run at 300uS/cm). Demin plant offline resulting in untreated water used in the boiler and therefore running the boiler at high TDS ---- scale formation ---- insufficient heat transfer --- tube collapsing. Poor control of TDS/Conductivity in the boiler (Manual blowdown system) ---- underblowdown underblowdown----- scale formation --- insufficient heat transfer ---- tube collapsing.
18 EFFLUENT REDUCTION FROM COOLING TOWER Cooling tower blowdown is +/- 80m3/day. Investigated the re-use of CT blowdown to the following areas, Acid dilution in the FAT and D&I Pump tanks, 76% acid dilution, Preparation of ATH slurry, After a thorough quality impact evaluation, it was decided to use the effluent for ATH slurry preparation. The effluent reduction achieved from this project was 18m3/day.
19 EFFLUENT REDUCTION FROM SANDFILTER BACKFLUSH Sand filter back flush used to be manually activated every morning for 20minutes (generating approximately 20m3 of effluent). Trials were conducted to establish at what Sand filter dp should the back flush takes place and for how long. After the trial, backflush was to be conducted at 100Kpa sandfilter dp. 50% effluent reduction from sandfilter backflush was incurred.
20 SUMMARY TOTAL EFFLUENT m3 Sandfilter 5 475m3 Cooling tower m3 Demin plant m3 Condensate 4 360m3 Boilers m3 Optimizing backflush system Re-using CT blowdown Installation of Counter current demin plant Recycling condensate Automating boiler blowdown Sandfilter 2 735m3 Cooling tower 4 680m3 Demin plant m3 Condensate 0m3 Boilers 2 436m3 TOTAL EFFLUENT m3
21 CONCLUSSIONS Establish water treatment plant capacity (Benchmark). Continuously monitoring feed water quality. Conduct water balance surveys on a frequent basis.
22 THANK YOU
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