Effect of Limited Aeration in COD Removal of a Side-Stream AnMBR
Sasidhar Koduvayur Balasubramanian (TU Delft - Civil Engineering & Geosciences)
Ralph Lindeboom – Mentor (TU Delft - Civil Engineering & Geosciences)
Saket Pande – Graduation committee member (TU Delft - Civil Engineering & Geosciences)
Antonella Piaggio – Coach (TU Delft - Civil Engineering & Geosciences)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.