Boiler-Feed and Process Water Reclamation from Biotreated Palm Oil Mill Effluent (BPOME): A Developmental Review

Increased water shortages and new environmental policies and regulations have stimulated significant development in reuse programs in the past 20 years.1 Reclaimed water has been recognized as a vital and drought-proof water source to ensure economic and agricultural activities. According to the conclusions of various water reuse surveys, the best water reuse projects, in terms of economic viability and public acceptance, are those that substitute reclaimed water in lieu of potable water for use in industrial, irrigation, environmental restoration, cleaning and toilet flushing. The main benefits of using reclaimed water in these situations are conservation of water resources and pollution reduction. 1 Low Pressure Membranes (LPMs) such as Microfiltration (MF) and Ultrafiltration (UF) integrated with adsorption system could be a viable option for separation of contaminants in wastewater for reuse as boiler-feed or process water in industry. This article technically discusses the main constituents of concern in boiler-feed and process water requirements and finally suggests potentially efficient and low-energy-low-cost hybridized LPM /adsorption treatment facilities to achieve this paradigm shift towards new water sources

Preparation and characterization of powdered activated carbon from empty fruit bunch

Different powdered activated carbon (PAC) samples were prepared from oil palm industrial residue namely empty fruit bunch (EFB). The prepared EFB samples were carbonized and activated in a horizontal furnace. Physical activation consisted of carbonization for 30 minutes using nitrogen gas followed by activation with CO2 gas at different flow rates, temperature and time were used to optimize production conditions. The PAC samples produced were investigated through adsorption study using phenol aqueous solution of 50 mg/L concentration. Characterizations of the best quality PAC samples produced were determined. The result of this work demonstrated that activation temperature had significant effect on the adsorption properties of the activated carbons. The PAC produced at activation temperature of 800oC, CO2 gas flow rate of 0.1 L/min and activation time of 15 minutes proved to be the best quality adsorbent as it had given 95.54% of phenol removal at initial 15 minutes contact time. Characterization of EFB based-PAC showed good quality adsorbent with highly active sites and well-developed pores with BET surface area of 374.37 m2/g. The experimental results indicated that the activated carbon prepared from EFB is a promising product in industrial applications as well in water and wastewater treatment

Boiler-Feed and Process Water Reclamation from Biotreated Palm Oil Mill Effluent (BPOME): A Developmental Review

Increased water shortages and new environmental policies and regulations have stimulated significant development in reuse programs in the past 20 years.1 Reclaimed water has been recognized as a vital and drought-proof water source to ensure economic and agricultural activities. According to the conclusions of various water reuse surveys, the best water reuse projects, in terms of economic viability and public acceptance, are those that substitute reclaimed water in lieu of potable water for use in industrial, irrigation, environmental restoration, cleaning and toilet flushing. The main benefits of using reclaimed water in these situations are conservation of water resources and pollution reduction. 1 Low Pressure Membranes (LPMs) such as Microfiltration (MF) and Ultrafiltration (UF) integrated with adsorption system could be a viable option for separation of contaminants in wastewater for reuse as boiler-feed or process water in industry. This article technically discusses the main constituents of concern in boiler-feed and process water requirements and finally suggests potentially efficient and low-energy-low-cost hybridized LPM /adsorption treatment facilities to achieve this paradigm shift towards new water sources

Optimisation of arsenic adsorption from water by carbon nanofibres grown on powdered activated carbon impregnated with nickel

Contamination of water due to arsenic (As) is increasing in many parts of the world. The removal of As from aqueous solution by using impregnated carbon nanofibres (CNFs) as the adsorbent is reported in this paper. The effects of pH, CNFs dosage, contact time and initial concentration of arsenic were studied at room temperature (±25°C). The interactions among the parameters were also investigated. The data obtained from the adsorption experiment were analysed using statistical software in order to develop a regression equation to represent the optimum operating conditions. The interactions of each parameters were considered during this analysis and the result indicated that the highest removal (97.25%) of As can be attained at pH 6, initial concentration of arsenic of 0.08 mg L-1, contact time of 60 min and CNF dosage of 200 mg L-1. Comparison between impregnated CNF and Powdered Activated Carbon (PAC) were also done and it is determined that impregnated CNF has better removal compared to PAC alone. The final concentration of As after the treatment using CNFs was about 8 ~ 10 times less than that of using PAC. Therefore, it can be concluded that CNFs are highly potential for the adsorption of As from water

Anti-cyanobacterial activity of Moringa oleifera seeds

Filtrates from crushed Moringa oleifera seeds were tested for their effects on growth and Photosystem II efficiency of the common bloom-forming cyanobacterium Microcystis aeruginosa. M. aeruginosa populations exhibited good growth in controls and treatments with 4- and 8-mg crushed Moringa seeds per liter, having similar growth rates of 0.50 (±0.01) per day. In exposures of 20- to 160-mg crushed Moringa seeds L−1, growth rates were negative and on average −0.23 (±0.05) .day−1. Presumably, in the higher doses of 20- to 160-mg crushed seeds per liter, the cyanobacteria died, which was supported by a rapid drop in the Photosystem II efficiency (ΦPSII), while the ΦPSII was high and unaffected in 0, 4, and 8 mg L−1. High-density populations of M. aeruginosa (chlorophyll-a concentrations of ∼270 µg L−1) were reduced to very low levels within 2 weeks of exposure to ≥80-mg crushed seeds per liter. At the highest dosage of 160 mg L−1, the ΦPSII dropped to zero rapidly and remained nil during the course of the experiment (14 days). Hence, under laboratory conditions, a complete wipeout of the bloom could be achieved. This is the first study that yielded evidence for cyanobactericidal activity of filtrate from crushed Moringa seeds, suggesting that Moringa seed extracts might have a potential as an effect-oriented measure lessening cyanobacterial nuisance

Relationship between adolescents’ family function with socio-demographic characteristics and behaviour risk factors in a primary care facility

Background: The family as a unit of care has great effect in tackling adolescent problems and this could be influenced by family functioning. Objective: This study assesses the relationship between adolescents’ family functioning with socio-demographic characteristics and behavioural risk factors. Method: The research was a cross-sectional, hospital-based study carried out at the General Outpatients Department, University College Hospital (GOPD,UCH), Ibadan, over a period of three months. Four hundred subjects were recruited using a modified Guideline for Adolescent Preventive Services (GAPS) questionnaire, with an incorporated family APGAR (Adaptation,Partnership, Growth, Affection, Resolve) score table. The results were analysed using the Statistical Package for Social Sciences (SPSS), version 11 and the findings on the family assessment and behavioural risk factors were relayed to the respondents. Results: The ages of the adolescents ranged from 10 to 19 years. Of the subjects, 8% were sexually active. Mean age for first coitus among the respondents was 15 ± 2.4 years. The rate of ingestion of alcohol and cigarette smoking was very low. The family APGAR scores obtained revealed that 84.5% subjects were rated as having a functional family (7–10 points) and 15.5% of the subjects were rated as having a dysfunctional family (0–6 points). There was a significant association between perceived family function and subjects’ occupation (p = 0.01), parent social class (p = 0.00) and subjects’ sexual activities (p = 0.00). Conclusion: The majority of the adolescents were rated as having functional families. Dysfunctional families had significantly sexually active respondents

Microfiltration of pretreated sanitary landfill leachate

A laboratory study using a bench scale model of two units operation involving coagulation process with Moringa oleifera seeds extract as a coagulant and filtration process using hollow fibre microfiltration membrane, was adopted to treat Air Hitam Sanitary Landfill leachate in Puchong, Malaysia. The performance of the microfiltration membrane in pretreated sanitary landfill leachate treatment was investigated through a continuous process. The leachate sample was passed through conventional coagulation process before being filtered through a hollow fibre microfiltration membrane of 0.1 µm surface pores. The hollow fibre microfiltration membrane decreased the turbidity, colour, total suspended solids, total dissolved solids and volatile suspended solids in the leachate by 98.30, 90.30, 99.63, 14.71 and 20%, respectively. The results showed that microfiltration is capable of removing high percentage of solids from leachate and might be considered as a polishing stage after on-site biological treatment for sanitary landfill leachate