TY  - EJOU
AU  - Jusoh, Hajjar Hartini Wan 
AU  - Kasan, Nor Azman 
AU  - Manan, Hidayah 
AU  - Nasir, Nurfarahana Mohd 
AU  - Yunos, Fareza Hanis Mohd 
AU  - Hamzah, Sofiah 
AU  - Jusoh, Ahmad 

TI  - Chicken Eggshell as an Innovative Bioflocculant in Harvesting Biofloc for Aquaculture Wastewater Treatment
T2  - Journal of Renewable Materials

PY  - 2023
VL  - 11
IS  - 5
SN  - 2164-6341

AB  - Implementation of biofloc technology (BFT) system in aquaculture industry shows high productivity, low feed
conversion ratio, and an optimum culture environment. This study was divided into two phases. The first phase
involved maintaining the water quality using the optimum carbon-to-nitrogen ratio by manipulating pH in culture water. The second phase examined the performance of harvesting biofloc (remaining phytoplankton and suspended solids in the system) using chicken eggshell powder (CESP). This study showed that pH 7 to 8 were the
best biofloc performance with high removal percentage of ammonia (>99%) with a remaining ammonia concentration of 0.016 mg L<sup>−1</sup> and 0.018 mg L<sup>−1</sup>
, respectively. The second phase of this study was performed to determine the optimal formulation and conditions of using CESP as a bio-flocculant in harvesting excess biofloc. The
use of eggshell showed a higher harvesting efficiency of more than 80% under the following treatment conditions:
0.25 g L<sup>−1</sup> of eggshell dosage; with rapid and slow mixing rates of 150 and 30 rpm, respectively; 30 min of settling
time; settling velocity of 0.39 mm s<sup>−1</sup> and pH of 6 to 7. Therefore, the results indicated that biofloc would be the
best green technology approach for sustainable aquaculture wastewater and the CESP is an organic matrix that
environmental-friendly bio-coagulant for biofloc harvesting.
KW  - Chicken eggshell; aquaculture; biofloc; coagulant; water quality; harvesting

DO  - 10.32604/jrm.2023.026086