Enhancement in mesophilic aerobic digestion of waste activated sludge by chemically assisted thermal pretreatment method.
The effects of hybrid microwave (MW)-alkali pretreatment methods on the efficiency of mesophilic aerobic digestion were studied. The MW-alkali pretreatment (95°C-pH 12) was observed to enhance the sludge solubilization synergistically from 0.5% (raw) to 52.5% (MW-NaOH) and 48.7% (MW-KOH), which are 20% greater than the additive value of MW only and alkali only (16%(MW)+28.4%(NaOH)=44.4% and 16%(MW)+25.5(KOH)=41.5). The higher VSS solubilization was observed for hybrid MW-NaOH (53.9%) and MW-KOH (47.4%) methods. The batch mesophilic (35°C) aerobic digestion system led to 81.1% TCOD degradation and 72.4% VSS degradation at 20 days of retention time, with 35% higher TCOD and VSS reduction in comparison with the control system. The filterability of microwave-alkali pretreated sludge was improved remarkably after aerobic digestion. Moreover, the proposed method is capable of effectively sanitize the sewage sludge and produce Class A biosolids.
Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan, ROC.
Vinay Kumar
VK
Tyagi
Shang-Lien
SL
Lo
D000468:Alkalies / Q000737:chemistry* / Q000528:radiation effects; D001420:Bacteria, Aerobic / Q000378:metabolism* / Q000528:radiation effects; D006361:Heating / Q000379:methods*; D008872:Microwaves; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
D000468:Alkalies; D012722:Sewage