9 research outputs found
Potential treatment of biodegradable organic matter in wastewater from wet market using Agro-Based Mixed Culture (ABMC)
No full textWastewater from wet market is mainly composed of suspended solids, high levels of organic pollutants, fats, oil, and grease and often being classified as „high strength‟. This wastewater must be treated in a manner that minimizes potential harm to public health and detrimental impacts on the environment. The conventional technologies require high cost. Increasing volumes of wastewater combined with limited space availability and tightening environmental standards has promoted the development of biotechnological processes for the treatment of wastewater. A laboratory-scaled shake-flask systems experiment was conducted to test the potential of using Agro-Based Mixed Culture (ABMC) to treat biodegradable organic matter in wastewater from wet market. Different variables were tested for 13 days treatment optimization including: types of agro-base material, mixture, concentration (%v/v) and agitation (rpm). The results were subsequently compared with wastewater sample without adding ABMC as the control. All water quality parameters analyzed showed significant difference (improving water quality) compared to untreated sample (P<0.01). Treatment for all parameters tested were highest using non-sterile ABMC.50% ABMC mixture, 100% ABMC concentration, 150 rpm agitation speed for 13 days. Highest percentage reduction of water quality parameter can best be observed for Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) with 86% and 63%, respectively, followed by Ammoniacal Nitrogen (AN) with 55% reduction. Dissolved Oxygen (DO) and turbidity gives only 36% improvement and 44% reduction. The pH turns acidic from 6.10 to 5.24. Optimized ABMC treats better than Commercial EM. A larger scale and long-term treatment was tested using suspended growth batch bioreactor for 31 days treatment. At day 13, treatment performance for all parameter was better in bioreactor as compared to shake-flask system. However, by prolonging the treatment time, treatment efficiency for DO and turbidity reduced. For BOD, COD and AN, the value became constant after certain period of time. The reduction of BOD, COD and AN achieved was up to 91%, 72% and 62%, respectively. DO improve only by 14% while turbidity reduction was 48%. This study indicated that ABMC has potential to treat biodegradable organic matter in wastewater from wet market. The application of ABMC in wastewater treatment is capable of being a cost-effective biological treatment method because it is from local agricultural product which is cheap and easy to obtain
Development of chitosan/pluronic F108/polyethersulfone (PES) nanofiltration (NF) membrane for oily wastewater treatment
No full textFabrication and characterisation of polyethersulfone/chitosan/non-ionic nanofiltration membrane for dyes removal
No full textDevelopment of polyethersulfone (PES)/silver nanoparticles (AgNPs)/polyethylene glycol (PEG) nanofiltration membrane
No full textDevelopment of chitosan/pluronic F108/polyethersulfone (PES) nanofiltration (NF) membrane for oily wastewater treatment
No full textThis study discusses a new finding for nanofiltration membrane development using phase inversion
technique whereby polyethersulfone (PES) polymer was added with surfactant and additive. This
research focuses on the development of a membrane that is efficient in treating oily wastewater and
reducing membrane's low permeation flux issues. Five PES nanofiltration membranes were
synthesized with pluronic F108 surfactant and different amounts of chitosan additive for each
formulation. Subsequently, the effect of adding surfactant and additive on membrane performance
was studied. Results showed that the membrane with the optimal amount of chitosan gave the
highest flux and the rejection of oily wastewater with up to 90%. In addition, Fourier transforminfrared (FTIR) spectroscopy technique was used to characterize and analyse the membrane's
properties. Hence, the developed membranes were successfully characterized and proved to be a
good treatment for oily wastewater
Preliminary analysis on the water quality index (WQI) of irradiated basic filter elements
No full textWater quality characteristic of the National Hydraulic Research Institute of Malaysia (NAHRIM) lake undergoing remediation by the constructed wetlands: a baseline study
No full textThis study was conducted to determine the baseline water quality characteristics of a contaminated NAHRIM lake undergoing remediation by the constructed wetlands, based on the physico-chemical and biological parameters. The sampling was conducted for six months (May-October) in 2016 from 5 stations of the lake and analysed using APHA standard methods for water and wastewater analysis, while Malaysian water quality index (WQI) was used to calculate quality of the lake. The results showed that, the Conductivity, Dissolved Oxygen, NO3-N, NO2-N, PO4, Temperature, Turbidity, TDS, TSS, and Zn were under class I, while pH, B and COD were categorized under class II. NH3-N, BOD, Fe, Escherichia coli, Total coliform and Mn were categorized as class III. Moreover, Al was not given any classification under NWQS but their concentration did not exceed EPA guidelines. Furthermore, as compared to the water samples from the constructed wetlands that reported a class III WQI, the lake was observed to show an overall class II WQI. This is suggestive of the retaining and remedial role of the constructed wetlands being the first point of contact for the contaminants going to the lake. Thus the lake is suitable for recreational activities
Preparation of polypropylene filter incorporated with titanium dioxide and reduced graphene oxide for real water treatment
No full textHerein, we report the hydrothermal preparation of a reduced graphene oxide/titanium dioxide incorporated porous polypropylene (PP-RGO/TiO2) filter for water treatment application. The as-prepared PP-RGO/TiO2 filter was characterized by Raman and Field Emission Scanning Electron Microscopy (FESEM) analyses. The Raman spectra suggested the successful reduction of GO to RGO and the incorporation of TiO2 into the RGO sheets. The photocatalytic activity of the PP-RGO/TiO2 filter was investigated in relation to the degradation of methylene blue (MB), and it showed complete degradation of MB after illumination by a halogen lamp for 2 h. Further, this PP-RGO/TiO2 filter was used for the treatment of real lake water. The dissolved oxygen (DO) of the lake water after being treated with the PP-RGO/TiO2 filter in the presence of ultraviolet (UV) irradiation showed great reductions of 7.5, 14, and 24% for the first, second, and third cycles, respectively. The chemical oxygen demand (COD) of the lake water was effectively decreased to 43, 27, and 16% in successive cycles by the PP-RGO/TiO2 filter with the assistance of UV. Moreover, a good reduction in the NH3–N concentration was also shown in lake water when it was treated under the same condition as the DO, with an increase in the ammonia removal of >27%. The PP-RGO/TiO2 filter maintained its ability to remediate wastewater even after three cycles of treatment
A preliminary study of marine water quality status using principal component analysis at three selected mangrove estuaries in east coast Peninsular Malaysia
No full textThis research presents marine water quality status in three different mangrove estuaries. The objective of this study is to evaluate the surface water quality of three estuaries in east coast Peninsular Malaysia. The parameters measured were Dissolved Oxygen (DO), pH, Biochemical Oxygen Demand (BOD), total dissolved solid (TDS), ammonium (NH4-N), turbidity (TUR), total suspended solid (TSS) and coliform. Monthly sampling was performed during the dry season, from June 2016 until September 2016. Data were analysed using principal component analysis (PCA). PCA yielded two PCs where VF1 forms strong factor loadings for pH, NH4-N, SAL, and TDS signifying saltwater intrusion in mangrove area. VF2 designed strong factors of BOD, TUR and Coliform and strong negative loading of DO indicating anthropogenic pollutions in the area. This study output will be a baseline setting for future studies in mangrove estuary marine water quality. Mangrove marine water samples of future monitoring studies in mangrove estuary will benefit by enabling understanding of pollution loading and coastal water quality. It is essential to plan a workable water quality modelling as powerful tool to simulate marine water quality and forecast future consequences to facilitate mangrove biodiversity conservation
