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

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

The document UASB Reactor Computer Science Engineering (CSE) Notes | EduRev is a part of the Computer Science Engineering (CSE) Course Environmental Engineering.
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Design of upflow anaerobic sludge blanket reactor (UASB)

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

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• At equilibrium, sludge produced per day = sludge withdrawn per day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
• Ration of height of sludge blanket to total height is ≈0.4- 0.5.
•  HRT (Hydraulic Retention Time)
• Solid Retention Time (SRT

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:

Reactor area required:

Reactor area required =

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## Environmental Engineering

14 videos|73 docs|70 tests

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