ANALYZING SIMULTANEOUS HETEROTROPHIC NITRIFICATION AND AEROBIC DENITRIFICATION POTENTIAL OF A NEWLY ISOLATED BACTERIUM, BACILLUS CEREUS STRAIN GS5 SND BY NEWLY ISOLATED BACILLUS CEREUS GS5 STRAIN
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING
Author(s): PRANGYA RANJAN ROUT , PUSPENDU BHUNIA , RAJESH ROSHAN DASH
Abstract: The present study aims in investigating simultaneous heterotrophic nitrification and aerobic denitrification (SND) ability of a newly isolated bacterium. The bacterial strain GS5 was isolated from a laboratory scale denitrifying bioreactor and characterized. Based on phenotypic and phylogenetic characteristics as derived from partial 16S rRNA gene sequence, the isolate was identified to be Bacillus cereus GS5 strain (Gen Bank accession no. KM212993). The strain had exhibited the capability of utilizing ammonia, nitrate and nitrite as sole nitrogen sources in presence of external carbon sources, thus heterotrophic in nature. Considering, initial concentration of ammonium as 50 mg/L, 92.02% was removed after 24h incubation with little accumulation of the intermediates such as hydroxylamine, nitrite, and nitrate. Similarly, the new isolate had a high denitrifying ability, from initial 100 mg/L nitrate, 98.26% was removed in a 24h period under aerobic conditions, with reduced level of nitr
- Publication Date: 26-Oct-2014
- DOI: 10.15224/978-1-63248-030-9-166
- Views: 0
- Downloads: 0
UNCERTAIN EVENTS THAT RESULTING A RISK OF AN INCREASE IN CONSTRUCTION COSTS(CASE STUDIES ON SOME OF THE CONTRACTORS IN INDONESIA)
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING
Author(s): JOSEFINE ERNESTINE LATUPEIRISSA
Abstract: The construction phase of the project implementation stage where the contractor has won the tender and has been prepared for the construction process, is an activity that contains the uncertain events which interact and may originate from internal and external environment of the project. Contractor as responsible and resource managers, must take into account the uncertain events that may lead to the risk of increased costs of the project compared to the initial cost estimate as a consequence of the unforeseen costs that arise during the course of construction. This study aims to identify uncertain events during the execution of the project, then the distribution of the uncertain events to appropriate parties to obtain the uncertain events that are the responsibility of the contractor. Primary data were obtained from several contractors in Indonesia through interviews and questionnaires, while secondary data obtained from the documentation for the implementation of the project. The resu
- Publication Date: 26-Oct-2014
- DOI: 10.15224/978-1-63248-030-9-161
- Views: 0
- Downloads: 0