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• W657109017 abstract "The study of microbial treatment of domestic wastewater treatment plant (DWTP)sludge by liquid state bioconversion (LSB) process was conducted by severalapproaches. A total of 70 strains of filamentous fungi were isolated from threedifferent sources (wastewater, DWTP sludge and landfill leachate), which belongedto the genera of Penicillium (39 strains), Aspergillus (14 strains), Trichoderma (12strains), Spicaria (3 strains) and Hyalojlorae (2 strains). In the screening test, thefungal strains WWZPI003 (Penicillium corylophilum), SCahmAI03 (Aspergillusniger), SCahmTI05 (Trichoderma hamianum) and PC-9 (Phanerochaetechrysosporium), among their respective groups of Penicillium, Aspergillus,Trichoderma and Basidiomycete, played potential roles in tenns of separation,biodegradation and filtration of treated DWTP sludge. The results of thecompatible mixed culture optimization study showed a compatible growth of themixed culture for PIA, PIPC and AfPC and the combinations PIT, AfT and T/PC were observed to be incompatible cultures for the bioconversion of the sludge.Among the combinations, the potential compatible mixed culture of PIA wasselected for DWTP sludge treatment in LSB process. The results obtained inoptimum LSB processes indicated that wheat flour (WF) at a concentration of 1.5-2% (w/w) was a better co-substrate in sludge containing medium, with optimuminitial pH of 4.5-5.5, temperature of 33-350C and inoculum size of 2-3% (v/w).Bioconversion of DWTP sludge was highly influenced by agitation and aerationrate that were 150-200 rpm and 0.5 vvrn, respectively. In a settleability anddewaterability study, 86.45% of TSS was settled in treated sludge while 4.35% inuntreated sample after one minute of settling operation. The results for specificresistance to filtration (SRF) showed that the fungal inoculum had significantpotentiality to reduce SRF by 99.8% and 98.7% for 1% and 4% of sludge,respectively. Bioconversion efficiency was higher by 0.2-20% in fermenter than inthe shake flask in terms of biosolids accumulation and biodegradation of organicmatters in sludge. In developed bioconversion processes, 93.75 g/kg of biosolidswas enriched with fungal biomass protein and nutrients (NPK), and 98.84% ofTSS, 98.22% of TDS, 97.33% of turbidity, 80.24% of soluble protein, 98.81% ofreducing sugar and 92.66% of COD in treated sludge supernatant were removedafter 8 days of treatment. SRF (1.39xlO12 m/kg) was decreased tremendously bythe microbial treatment ofDWTP sludge after 6 days of fermentation. LSB processfor microbial treatment of DWTP sludge is a new biotechnological approach thathas economic value and is non-hazardous as well as environmental friendly, andtherefore may be encouraging to sludge management strategy in futureapplications." @default.
• W657109017 created "2016-06-24" @default.
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• W657109017 date "2002-07-01" @default.
• W657109017 modified "2023-09-27" @default.
• W657109017 title "Microbial Treatment of Domestic Wastewater Treatment Plant Sludge by Liquid State Bioconversion Process" @default.
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