Effects of microaeration on hydrolysis of primary sludge are investigated in 500 ml batch reactors at 377 °C. Two experiments, one with a microaerobic inoculum and one with a combination of a microaerobic and an anaerobic inoculum, are carried out to also investigate the role of the inoculum. Assuming an acidogenic, methanogenic and aerobic biomass yield of 0.1, 0.05 and 0.45 mgC/mgC, respectively, a 50–60% hydrolysis increase, during the 4 day experiment, is observed with a ratio between aerobic and anaerobic metabolism in the range 0.5–0.7. The extra hydrolysed products are oxidized to carbon dioxide and incorporated into new biomass. The oxygen utilization to carbon dioxide production ratio was ∼1:1 on a mol basis. Effects of the oxygen supplied on the hydrolysis of carbohydrates, proteins and lipids are analyzed based on measurements and balances of dissolved carbon, nitrogen and COD. The total observed hydrolysis increase can be accounted for by increased hydrolysis of carbohydrates and proteins. Lipids are only hydrolysed when anaerobic inoculum is added, but no effect of oxygen availability is detected.
Skip Nav Destination
Article navigation
Research Article|
April 01 2006
Enhancing hydrolysis with microaeration Available to Purchase
J.-E. Johansen;
1Institute of Process, Energy and Environmental Technology, Telemark University College, Post box 203, N-3901 Porsgrunn, Norway
E-mail: [email protected]
Search for other works by this author on:
R. Bakke
R. Bakke
1Institute of Process, Energy and Environmental Technology, Telemark University College, Post box 203, N-3901 Porsgrunn, Norway
Search for other works by this author on:
Water Sci Technol (2006) 53 (8): 43–50.
Citation
J.-E. Johansen, R. Bakke; Enhancing hydrolysis with microaeration. Water Sci Technol 1 April 2006; 53 (8): 43–50. doi: https://doi.org/10.2166/wst.2006.234
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00