Design Optimization of Sludge Hygenization Research Irradiator

Simulation and optimization of sludge hygienization research irradiator

“…Both the approaches are computationally costly. Mahendra et al [12] have used an approach which is based on calculation of volume averaged and time averaged dose rate in the post-processing phase. The present approach is computationally much cheaper [12] and agrees well with the experimental dosimetry data [2] as it incorporates features of an Eulerian as well as Lagrangian model by taking dose absorption as well as residence time into account.…”

“…Computationally expensive CFD coupled with dose calculation using Monte Carlo photon transport code gave VADR as 0.725 kGy/hr and TADR as 0.664 kGy/hr. The VADR of 0.609 kGy/hr and TADR of 0.812 kGy/ hr [12] was evaluated based on the CFD calculation coupled with Yamakoshi's dose evaluation model [22]. The approach based on recurrent neural network and modified Sievert integral gave VADR as 0.758 kGy/hr and TADR as 0.635 kGy/hr.…”

“…Subsequent use is made of the product as a safe fertilizer. Mahendra et al [12] carried out design optimization of the irradiator vessel for its multiple planar source assembly. A schematic diagram of an existing irradiator with its source arrangement is shown in Fig.…”

“…The irradiator vessel uses set of two Cobalt-60 pencils placed in each of the 13 tubes. All of these 26 numbers of such Cobalt-60 pencils do not have the same radioactivity levels thus optimization is required for source placement in order to maximize the dose absorption [11,12]. Management of sludge flow rate also becomes an important issue so as to maintain the required dose level as the radioactivity decays with time.…”