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A Presentation on
Deep Shaft Process
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Introduction:
•The Deep Shaft Process is a mechanism of ultra depthaeration with the depth of 40 to 150 m as an aeration tank.
•It can treat the waste water at higher rate because of higher dissolved oxygen density which activates the micro-organism efficiently.
•It is also known as a space efficient and energy efficientbiological process and widely used in treatment of industrial waste.
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Deep Shaft AdvancedBiological Treatment Process:
• High intensity aerobic liquideffluent treatment process.With oxygen transfer ratetypically 10 times higher thanconventional process.
• Well suited for treatment of high strengths wastes withlow footprint operating andcapital cost
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Description:
• The effluent circulates rapidly in the shaft driven by theinjection of compressed air which provides a differentialdensity in the riser and down comer.
•
The resultant turbulent flow provides intense mixing of gas, liquid and biomass.
• The liquor typically takes between two and six minutes tocirculate once around the shaft and head tank and on
average it circulates 20 to 40 times before discharge.
• The low ratio of the feed to the re-circulation flow meansthat the feed is rapidly diluted and mixed with the entiremass of activated sludge in the system.
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Performance and Characteristics:(Examples for paper-manufacturing)
BOD removal rate: >90% (215mg/l -> 10mg/l)
COD removal rate: >80% (260mg/l -> 37mg/l)
BOD volumetric load: 3.7kg/(m3 d)
Retention time: 1h
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Operational advantages of DeepShaft:
• Full automation possible with minimal instrumentation.
• Resistance to changes in flow rates, BOD loadings and
toxins results in robust and reliable performance.
• Capable of treating a wider range of liquor strengths(typically 1 - 30 kg BOD/m3.day compared with 0.4 -1.3for conventional plants).
• Can operate at higher MLSS concentration (3-10 g/lcompared to 2-5 g/l) for conventional plants.
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• Design sludge loading (kg BOD per day/kg of MLSS) ishigher, (0.7 to 3.5 compared with 0.1 to 0.5), and this
reduces reactor size.
• Limited growth of filamentous organisms meansimproved sludge settling and smaller clarifiers.
• Less sludge produced per kg BOD removed.
•
No moving parts with low maintenance costs.
• Overall cost effective high performance.
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General advantages of Deep Shaft:
• Proven technology with more than 80 plants in operation
• Mechanical simplicity.
• Low capital and operating costs.
• Low land area requirements.
• Low environmental impact (low odour, mist and noise). Also largely underground.
•
High energy efficiency of 1-4Kg BOD/kWhr.
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•Primary treatment not required.
• High oxygen intensity (up to 2.5 Kg/M3/hr compared to0.1 to 0.3 for conventional processes).
• High efficiency of oxygen utilization.
• High BOD removal rates.
• Process is unaffected by climatic changes.
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Applications:
• Pulp paper paper-product manufacturing industry
• Food industry
• Chemical industry
• Sewage industry
• Office buildings (flushing water recycling system)
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Thank You