Degremont Water Clarification Technologies

Transcription

1 Degremont over 70 years of providing treatment solutions MEMBRANE Wide range of t reatment solutions Headwor ks Disinfection Biology Bios olids Separation Recy cle/reus e Membrane Degremont Water Clarification Technologies Case Study of AQU AD AF Clarifier presented by Mukesh GROVER Tech nical Dir ecto r Degremont Water Clarification Technologies q Turbocirculator - solids contact q Densadeg - high rate solids contact with lamella tube q Pulsator - pulsating sludge blanket q Pulsatube - pulsating sludge blanket with lamella tubes q AquaDAF - very high rate dissolved air flotation Slide: 2 Degremont Clarif ication Technologies Typical Clarification Rates and Application Turbocirculator Clarif ier High rate solids contact type reactor clarifier Clarific ati on Te chnol ogy Turbocirculator Densadeg Pulsator Pulsatube AquaDAF Ty pi cal Cl arifi ca ti on Ra te s (m/hr ) 2.0 to 3.5 (upto 5.0 for softening) 10.0 to 20.0 (upto 30 for softening) (upto 100 for storm water) 2.5 to to to 40.0 Ty pi cal A ppl ic ati on Clarification, Softening Clarification, Softening, Storm water clarification, Filter Washwater clarification Clarification (>10 NTU) Clarification (<50 NTU) Maj or I ndi an Ins ta lla ti ons Delhi, Angul (Orissa) Delhi, Bangalore Delhi, Chennai, Bangalore, Mumbai, Kolkatta Bangalore Typical applications: DW : Clarification, Lime Softening, Presettler WW : Primary & Tertiary Clarification IWW/PW : Carbonate removal, Metal Precipitation, Colour removal Simple & robust process Very efficient Multiple application Slide: 3 Slide: 4

2 Densadeg Clarif ier High rate solids contact type Lamella clarifier Pulsator Clarif ier Pulsating sludge blanket type clarifier Typical applications: DW : Clarification, Lime Softening WW : Primary & Tertiary Clarification IWW / PW : Carbonate removal, Metal Precipitation, Colour removal Typical applications : Raw Water Clarification (River, Dam, Reservoir) Clarification of Water with Algae Compact, Versatile & robust Inbuilt Thickener Very efficient High Quality Water Multiple applications Modular & robust process Rectangular Flat Bottom RCC Tank No underwater moving parts Even water distribution over entire bottom Even sludge withdrawal across the tank Slide: 5 Slide: 6 MEMBRANE AquaDAF Clarifier High-Rate Dissolv ed Air Flotation Technology by Degremont Typical applications: Dissolved Air Flotation process Clarification of low turbidity waters Water with low density solids (i.e. Algae, etc.) Water with high TOC Cold waters; Thermal variation pretreatment before Membrane filtration Simple & robust process Very small footprint Modular Polymer not necessary Slide: 8

3 Internal System (HF Model) Operating Principles Flash Mixer Hydraulic Flocculation Com pr essed Air Sludge Channel Air-Water Dispersion Zone Recycled clarified water Mobile Weir Clarified Water Channel Recycle St ream: Recycle flow: 8-10% of throughput Recycle flow Operating Pressure: 4-5 bar Accumulated Sludge Layer Unpacked Saturator Vessel Compressed air injection Sludge Micro-Bubble Production: Bubbles production : special depressurization nozzles Clarified Water Bubble diameter: Range µm Air Blanket: Milky appearance Raw water Solids adhere to bubbles and float to surface Continuous production of air blanket Coagulated Water Inlet (after Flash Mixer) False Fl oor Flotation Zone Slide: 9 Transition Zone Slide: 10 Advantages Major References worldwide Flexible & Robust : treats water with temperature >3 C best solution for low turbidity / high algae raw water adapts to occasional peaks of TSS or Turbidity upto 200 NTU. Cost effective : Reduction in the time required for the response to 5 min Decrease the size of footprintwhile retaining its performance. Easy to operate : Easy to operate and maintain (very few mechanicals, no lamella modules, no clogging) No need to add material to weigh down the flocs. Instantaneous Start and Stop. Slide: 11 USA - Seneca USA - South San Joaquim FRANCE - St Brieux CANADA - Gatineau CHINA - Macao FRANCE - Apremont USA - White Tanks USA - Lake de Forest CHILE - Minera Escondida CHINA - Qin Gzhen BRAZIL - Manaos SPAIN - Barcelona Slide: MLD 34 MLD 35 MLD 44 MLD 60 MLD 72 MLD 77 MLD 80 MLD 92 MLD (sea water) 106 MLD 285 MLD 480 MLD (sea water) BAHRAIN - Al Dur 575 MLD (sea water) INDIA Bangalore 600 MLD (u/c) USA Howarth, NJ 770 MLD (u/c)

4 TK Halli WTP, Bangalore - Project Fact Sheet TK Halli WTP, Bangalore - Project Fact Sheet Client : Bangalore Water Supply and Sewerage Board Location : TK Halli (~85 km from Bangalore city) Objective : Drinking water production for Bangalore city and suburbs Raw water source : River Cauvery, from Shiva Balancing reservoir Treatment Line : Water Line : Cascade Aerator + Prechlorination + Flash Mixer (with alum) + AquaDAF Clarfier + Aquazur VRapid Gravity Sand Filter + Post chlorination Sludge Line : Sludge Thickener + Mechanical Dewatering Commission ing Jan-Feb 2012 Main driv ers in technology selecti on - Highly Rocky Terrain, hence small footprint for fast & opti mum construction cost - Low turb idity water, but with spikes - Light solids,requiring high chemical consumption for clarification by settling - A lgae,incidental increase in algae in raw water affecting the fil ters - Direct Filtration mode operation when Turbidity < 5 NTU (to op timise OPEX) AquaDAF HF30 Design Perfo rman ce Plant treatment capacity Raw water quality (turbidity) Water loss Treated water quality (turbidity) Longer Filter runs 10 units x 90 m 2 each 28 m 3 /m 2.hr design clarification rate Flocculation Hydraulic Hydraulic Desludging by Mobile Weir on clarified water side Footprint = 4,000 m 2 <<< 1/4th of are a re qd. by Lamel la Clari fier > >> AquaDAF 600 MLD 20 NTU (90%iles), 100 max. - < 5 NTU (typically< 2 NTU) - Overall Plant 600 MLD - < 2% < 0.5 NTU 72 hrs (3 days) Slide: 13 Slide: 14 TK Halli WTP, Bangalore Project Fact Sheet Photo Gallery AquazurV Rapid Gravity Sand Filters (24 units) Battery of AquaDAF AquaDAF (10 un its) Cascade aerator Flash Mixer Mixer (2 sets) Sludge Thickener, Dewatering Building Parshal Flume Slide: 15 Slide: 16

5 Air-water saturator False floor Uniform Air Blanket: Milky appearance Slide: 17 Nozzles for microbubl es producti on Slide: 18 Floating Sludge Formation Clarified Water under Floating Sludge Floating Sludge Slide: 19 Slide: 20 Hydraulic Desludging

6 Thank you... Slide: 21 Slide: 22 DAF System Key to High-Rate Operation + Speci al False Floor = High-Rate AquaDAF Clarifi er Special False Floor: Key to High Rate Operation CFD M odel Irregular hole pattern Headloss across floor creates a circular flow pattern within basin Introducing flow resistance to create uniform flow distribution Highly concentrated bubble bed main tained within float area As loadin g rate o n a co nvent ional system increases t here is a tende ncy f or short-circuit ing a nd bubb le bla nket ex pansi on. This can lead to solids carry over. In AquaDAF, a special false floor is construc ted (Plastic/wo ode n panels) w ith a special hole pattern. It introd uces flow resistance an d promotes unif orm flow dis tributi on. Headloss across the floor creates a circular flow pa ttern. T he hi ghly concen trated b ub ble bla nket i s maintained i n th e floa t area at rates of 20 m 3 /m 2 //hr and higher. Enhanced coalescing of sludge High clarification rates: 25 to 40 m 3 /m 2 /hr Slide: 23 Slide: 24