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Title:	Treatment of domestic wastewater through pilot hybrid reed bed constructed wetland system
Authors:	Omar Hamed Omar Jehawi (P64448)
Supervisor:	Siti Rozaimah Sheikh Abdullah, Prof. Ir. Dr.
Keywords:	Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Domestic wastewater Wetland system
Issue Date:	19-May-2020
Description:	There are several methods to treat domestic wastewater for intended use. One of treatment wetlands is through a Hybrid Reed Bed Constructed Wetland system (HRBCW) system. Combination of constructed wetlands (CWs) enhances pollutant removal efficiency as hybrid CWs could cover the limitation of each single CWs. In our study we employed a HRBCWs in three-stages, consisting of mix of three type of flow systems, Surface-Flow (SF), Vertical-Flow (VF) and Horizontal-Flow (HF), with dimension for each tank was 2 m (L), 1 m (W), 1 m (H). The media in each flow system was arranged from top to bottom, with three layers of medium-sized gravel (10-15 mm diameter), river sand (3-5 mm diameter), and larger-sized gravel (30-35 mm diameter). The first HRBCW system connected surface flow (SF), vertical flow (VF) and horizontal flow (HF) system (SF-VF-HF) as HRBCWs1, the second connected SF1-SF2-HF as HRBCWs2, the third connected SF-VF1-VF2 as HRBCWs3, and the last HRBCWs connected SF-VF-HF and another system as unplanted system for control measure. The domestic wastewater collected in a sedimentation tank from 110 households in Bukit Puteri, Universiti Kebangsaan Malaysia was used for the entire experiment. Water quality (DO, pH, Temperature, Turbidity, COD, TSS, NH3-N, NO3-N and PO4-P) were monitored in all the systems, within 3-days hydraulic retention time. All the systems were planted with Scirpus grossus that could survive and reproduce with batch and continuous feeds of 86.5 L/day of the raw wastewater. The results indicate that the system with different sizes of gravels can achieve average COD removal efficiency of 84.52%, 71.62%, 76.56% and 78.43% for HRBCWs1, HRBCWs2 HRBCWs3 and control system respectively under batch operation, and achieved 82.96%, 79.17%, 78.28% and 49.79% respectively under continuous operation. Whilst, the TSS removal efficiency under batch operation were 86.35%, 84.13%, 81.71% and 77.64% respectively, and for continuous operation were 85.69%, 79.43%, 80.63% and 75.32% respectively. Also, the average removal efficiency of NH3-N under batch operation were 87.70%, 79.90%, 87.12% and 75.81% respectively, and average removal efficiency under continuous operation were 84.68%, 77.66%, 86.22% and 74.74%, respectively. For the PO4-P removal efficiency were 67.31%, 63.36%, 62.93% and 52.76% respectively in the batch operation but in the continuous operation were only 70.97%, 67.35%, 69.43% and 60.44% respectively. In addition, the kinetic removals were investigated with the results show that k1 values for HRBCWs1, HRBCWs2 and HRBCWs3 under batch operation are in the range of 0.35-0.47, 0.28-0.49 and 0.41-0.43 d-1, respectively. In contrast, the higher k1 values under continuous operation ranged from 0.35-0.53, 0.31-0.51 and 0.17-0.51 d-1, respectively. The NH3-N biosorption by HRBCWs1, HRBCWs2 and HRBCWs3 were well fitted to the pseudo first-order plot, respectively. The planted HRBCW systems shows a better performance than control system. In conclusion, the findings from this study have given evidence that the HRBCWs1 using S. grossus with SF-VF-HF arrangement has the best removal effectiveness for treating domestic wastewater. Hence, HRBCW has been proven to be effective for domestic wastewater treatment and can be suitably applied for small community.,Ph.D.
Pages:	318
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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