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http://dx.doi.org/10.4491/KSEE.2011.33.8.578

Effects of Air Supply Rate and Eggshell Addition on Liquid Fertilizer Efficiency of Aerobic Stabilized Organic Wastewater Sludge  

Cheon, Hyo-Chang (Department of Environmental Engineering, Daegu University)
Hwang, Eung-Ju (Department of Environmental Engineering, Daegu University)
Kim, Sang-Hyoun (Department of Environmental Engineering, Daegu University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.33, no.8, 2011 , pp. 578-582 More about this Journal
Abstract
Aerobic digestion of organic sludge generates stabilized slurry which could be used as a nitrogen-rich liquid fertilizer. In this study, the effects of air supply rate and eggshell addition on the sludge fertilizer efficiency were examined. Sludge from a wastewater treatment plant in a food industry was fed to a lab-scale aerobic digester, and the fertilizer efficiency was assessed by the growth of cucumber. Increase of air supply rate up to 200 mL/L/min enhanced the fertilizer efficiency as well as the nitrification efficiency. The addition of eggshell, a potassium-rich leftover, in fertilizer application was also beneficial to the cucumber growth. A proper control of air supply rate and the use of an inexpensive additive would guarantee the quality of sludge liquid fertilizer.
Keywords
Organic Sludge; Aerobic Digestion; Liquid Fertilizer; Fertilizer Efficiency;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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