Abstract
Forty six bacterial strains were isolated from nine different sources in four treatment plants namely Indah Water Konsortium (IWK) sewage treatment plant, International Islamic University Malaysia (IIUM) treatment plant-1,-2 and -3 to evaluate the bioconversion process in terms of efficient biodegradation and bioseparation. The bacterial strains isolated were found to be 52.2% (24 isolates) and 47.8% (22 isolates) in the IWK and IIUM treatment plants respectively. The results showed that the higher microbial population (9-10x104 cfu mL-1) was observed in the secondary clarifier of IWK treatment plant. Only the gram-staining identification was done in the strains isolated from IWK treatment plant not to be determined from IIUM. Among the isolates from IWK, 10 isolates of gram-positive bacillus (GPB) and gram-positive cocci (GPC), 10 isolates of gram-negative bacillus (GNB) and rest were both or undetermined. Gram-negative cocci (GNC) were not found in the isolates from IWK.
Highlights
Sewage treatment plants are artificial ecosystems in which the biodegradation of organic pollutants is carried out mainly by bacterial communities and producing excess sludge
The maximum population density (9-10x104 cfu mL 1) of bacterial communities was counted in the influent of secondary clarifier of Indah Water Konsortium (IWK) treatment plant followed by the Islamic University Malaysia (IIUM) treatment plant-3 (6-7x104 cfu mL 1), -2 (2.5-3x104 cfu mL 1) and -1 (2.2-2.5x104 cfu mL 1), respectively
The results indicated that the bioconversion of wastewater sludge might be effective through gram-positive and/or gram-negative strain especially isolated from IWK treatment plant as well as the IIUM treatment plants
Summary
Sewage treatment plants are artificial ecosystems in which the biodegradation of organic pollutants is carried out mainly by bacterial communities and producing excess sludge. This excess sludge presents serious disposal problems due to its huge quantity and toxicity. The effective bioconversion process is being considered to treat the wastewater sludge through potential microorganisms involved. In this process, the potential bacterial strains isolated from different wastewater treatment plants are involved to degrade the dissolved and suspended organic substances in sludge and enhance the biodegradation, biosolids reduction and bioseparation processes. Among microorganisms participating in activated sludge communities bacterial isolates have been attracting increasing attention in terms of faster growth, high resistance to contaminate and adaptation compared to other organisms from biotechnological point of view
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