Effect of Limited Aeration in COD Removal of a Side-Stream AnMBR

Student report (2018)

Authors

S. Koduvayur Balasubramanian Civil Engineering & Geosciences

Contributors

R.E.F. Lindeboom Sanitary Engineering - CEG (supervisor 1)
S. Pande Water Resources - CEG (supervisor 2)
A.L. Piaggio Sanitary Engineering - CEG (coach)
Faculty
Civil Engineering & Geosciences
Copyright: © 2018 Sasidhar Koduvayur Balasubramanian
Anaerobic Digestion Limited Aeation COD Removal Side-stream AnMBR
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Published Date

01-11-2018

Language

English

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Faculty

Civil Engineering & Geosciences

Abstract

Anaerobic wastewater treatment is a preferred attractive treatment mainly because of its simplicity and compactness as it produces lesser sludge compared to the aerobic system. Despite this, it has its own disadvantages as it takes more time for bacterial growth and treatment and also contributes to nutrients such as N and P to the effluent. Anaerobic digestion can be divided into four categories namely hydrolysis, acetogenesis, acidogenesis and methanogenesis. Hydrolysis is generally the rate limiting step of an anaerobic digestion. Studies show that hydrolysis is faster in aerobic process than in anaerobic process. Hence, hydrolysis may be fastened by supplying air. But oxygen inhibits the growth of strong anaerobes in the later stages of anaerobic digestion mainly affecting methanogenesis. This study focusses on studying the removal of organics by using 0.05vvm air into the filtration part of an 8-litre side-stream AnMBR with a fly ash membrane filter module. The result thus obtained is compared with a 100-litre AnMBR of similar construction without any air. The study observed a higher removal of COD in the aerated system than the non-aerated system.