UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

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Computer Science Engineering (CSE) : UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

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Design of upflow anaerobic sludge blanket reactor (UASB)

UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

Figure 4.6.1:  Schematic diagram of up flow anaerobic sludge blanket (UASB)

 

Table 4.6.1. Recommended loading on UASB reactor based on the COD concentration

UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

Where, COD: Chemical Oxygen Demand; OLR: Organic Loading Rate; SLR: Organic Loading on Sludge Blanket; HRT: Hydraulic Retention Time.


Important Design Points 

  • For temperature > 200c, SRT of around 30-50 days is used. 
  • At equilibrium, sludge produced per day = sludge withdrawn per day 
  • Average concentration of sludge in UASB reactor UASB Reactor Computer Science Engineering (CSE) Notes | EduRev
  • Ration of height of sludge blanket to total height is ≈0.4- 0.5.
  •  HRT (Hydraulic Retention Time)  UASB Reactor Computer Science Engineering (CSE) Notes | EduRev
  • Solid Retention Time (SRT UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

Problem 4.6.1: Given that the influent to UASB reactor has following characteristics: BOD = 350 mg/l; COD = 820 mg/l, TSS= 395 mg/l, VSS= 270 mg/l, flow rate=8000 m3/d, depth of sludge blanket=2.2 m, reactor height (including settler)=5 m, effective coefficient (ratio of sludge to total volume in sludge blanket)= 0.85.
 Determine HRT for sludge age of 30 days assuming 80% BOD removal efficiency; reactor area, and organic loading on reactor and the sludge blanket.

 Solution:

UASB Reactor Computer Science Engineering (CSE) Notes | EduRev
UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

Reactor area required:

Reactor area required = UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

 

Organic loading rate (OLR) = UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

 

Organic loading rate (OLR)  = UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

 

Organic loading on sludge blanket (SLR)

   UASB Reactor Computer Science Engineering (CSE) Notes | EduRev
UASB Reactor Computer Science Engineering (CSE) Notes | EduRev

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