85 research outputs found
Moringa oleifera seed derivatives as potential bio-coagulant for microalgae chlorella sp. Harvesting
No full textAquaponics recirculation system: a sustainable food source for the future water conserves and resources
No full textThe current and escalating extent of soil degradation, water scarcity and environmental concern
plaguing agricultural productivity, demands re-assessing the direction of food production. Aquaponics
is a concept relatively new to modern food production methods and can contribute to food security.
This study was conducted to establish sustainable aquaculture systems that maximize benefits and
minimize the accumulation of detrimental compounds and other types of negative impacts on both
natural and social environments. This study carried out at an average inflow rate of 1.28 m/day to
evaluate the operation of the aquaponics recirculation system (ARS) on nutrients removal and growth
and yield of African catfish as well as water spinach. A special design of ARS was used to provide
nitrification of fishery wastewater, where the combination of sands and gravels in hydroponics trough,
providing both surfaces for biofuel development and cultivation area for plants. Removal efficiencies
of 5-day biochemical oxygen demand (BOD5), total suspended solids (TSS), total ammonia nitrogen
(TAN), nitrite-nitrogen (NO2-N), nitrate-nitrogen (NO3-N), and orthophosphate (PO4
3-
) were 82%, 89%,
93%, 94%, 81%, and 80%, respectively. The feed conversion ratio (FCR) and specific growth rate
(SGR) of African catfish were 1.08 and 3.34% day-1
, respectively. The average water spinach
production was 3.56 kg per m2
. This study showed that ARS is a method of producing crop along with
a healthy protein source and among the best alternatives for achieving economic and environmental
sustainability
A study of coagulating protein of Moringa oleifera in microalgae bio-flocculation
No full textMoringa oleifera is characterized by high coagulation properties, low cost and low toxicity hence is very promising to be utilized as an alternative coagulant to recover microalgae biomass from its suspension system. Hence, this study was performed with the objective to investigate the potentiality of M. oleifera as coagulant agent in harvesting microalgae and to investigate the effect of zeta potential in its coagulation-flocculation activity. Bradford protein assay was applied for rapid and accurate determination of protein concentration in the M. oleifera seed powder and protein powder. The flocculation activities were determined at isoelectric pH by computing the flocculation efficiency in terms of microalgae biomass recovery and removal percentage at various coagulant dosages. It was observed that the protein concentration was 211.71 μg g−1 mL−1 in M. oleifera seed powder and 188.16 μg g−1 mL−1 in protein powder which yielded 97% and 78% of biomass recovery, respectively at the dosage of 10 mg L−1. Result showed that M. oleifera seed derivatives supersede chemical coagulant, alum which yielded 34% of biomass recovery at the same dosage. M. oleifera seed powder and protein powder was proven to be highly promising bio-coagulant and suitable alternative to the chemical coagulant in environmentally-sustainable harvesting of microalgae biomass
Development and utilization of engineered aquaponics recirculation system for aquacultures species
No full textThe integration of hydroponics plant production into recirculating aquaculture
system namely aquaponics appears to be an excellent way of saving water,
improve waste management as well as the production of a commercially
useful hydroponics by products. The emergence of the self contained food
production systems based on aquaponics is a fairly new concept and remains relatively undeveloped in Malaysia. This study was conducted to develop and utilize a pilot scale of aquaponics recirculation system (ARS) as
the design protocol for the development of an economically feasible and
environmentally sustainable aquaculture industry in Malaysia
Nutrient removal from aquaculture wastewater by vegetable production in aquaponic recirculationsystem
No full textNutrient removal is essential for aquaculture wastewater treatment to protect receiving water from
eutrophication and for potential reuse of the treated water. The integration of aquaculture with agriculture appears to be an excellent way of saving water, disposing aquaculture wastewater and providing fertilizer to the agricultural crop. The study was conducted to evaluate aquaponics recirculation system (ARS) performance in removing inorganic nitrogen and phosphate from aquaculture
wastewater using water spinach (Ipomoea aquatica) and mustard green (Brassica juncea). The results
showed that water spinach was able to significantly reduce the total ammonia nitrogen, nitrite-N,
nitrate-N and orthophosphate with efficiencies of 78.32–85.48%, 82.93–92.22%, 79.17–87.10%, and
75.36–84.94%, respectively, compared to mustard green that removed the nutrients in the range of
69.0–75.85% for total ammonia nitrogen, 72.49–79.34% for nitrite-N, 66.67–80.65% for nitrate-N, and
66.79–77.87% for orthophosphate. Overall results suggest that water spinach is better than mustard
green in nutrient removal in the aquaponics system used due to its root structures provided more
microbial attachment sites, sufficient wastewater residence time, trapping and settlement of suspended particles, surface area for pollutant adsorption, uptake, and assimilation in plant tissues
Exploratory study on safety climate in Malaysia automotive manufacturing
No full textSafety climate scrutiny has given attention by the organization in increasing productivity and efficiency in the workplace. The purpose of this study was to determine the relationship between safety climate construct factors and safety climate. Safety climate measurement as developed by Vinodkumar and Bashi (2009) was used and distributed to the selected respondent in national automotive manufacturing plant, whereby 195 respondents were participated in data collection. Internal consistency of six safety construct factors and
correlation between safety construct factors and safety climate were validated using reliability analysis and Pearson correlation, respectively. The survey instrument scores had acceptable overall internal consistency (α = 0.913). The correlation analysis indicated that only two
factors in safety construct factors have significant with safety climate. Both of factors are enforcement of regulation and procedure of safety and safeness of work environment. The finding of this study provides a useful framework for the organization in practicing safety
climate. Organization should pay more attention to enforcement of regulation and procedure of safety as well as safeness of work environment in order to improve safety climate
A sustainable food source for the future water conserves and resources
No full textDeveloping sustainable food sources to meet the demands of a growing population is a challenge. The current and escalating extent of soil degradation, water scarcity and climate-related challenges plaguing agricultural productivity, demands for re-evaluation the way of food production. Aquaponics is a concept relatively new to modern food production methods and can contribute to food security. The technology combines the aquaculture and hydroponics to yield a method of food growing that greatly reduces the use of water resources and produces fresh and nutritious crops in the form of vegetables and fish. This study was carried out at an average inflow rate of 1.28 m/day to evaluate the performance of aquaponics recirculation system (ARS) on nutrients removal and growth and production of African catfish as well as water spinach. A special design of ARS was used to provide nitrification of fish wastewater, where combination of sands and gravels in hydroponics trough, providing both surfaces for biofilm growth and cultivation area for plants. Removal efficiencies for 5-day biochemical oxygen demand (BOD5), total suspended solids (TSS), total ammonia nitrogen (TAN), nitrite-nitrogen (NO2-N), nitrate-nitrogen (NO3-N), and orthophosphate (PO43-) were 82%, 89%, 93%, 94%, 81%, and 80%, respectively. The feed conversion ratio (FCR) and specific growth rate (SGR) of African catfish was 1.08 and 3.34% day-1, respectively. The average water spinach production was 3.56 kg per m2. This study showed that ARS is a method of producing crop along with a healthy protein source and among the best alternatives for achieving economic and environmental sustainability
Musculoskeletal disorders among 'Canting' batik workers in Kuala Terengganu
No full textIn a typical procedure of “canting” process, the batik workers have to stand for a long period of time and
sometimes they have to bend their bodies. If these techniques of working are practiced for a long period of time, it is believed to cause back pain and musculoskeletal disorders (MSDs) problems among the workers and also affect the productivity of their work. This paper presents a study in batik industry with the objective of determining any musculoskeletal disorders among batik workers caused by working tasks in “canting” process. The study was conducted in Kuala Terengganu area where MSDs symptoms of batik workers were identified
through questionnaires adopted and modified from a Standardized Nordic Questionnaire (SNQ) for analysis of
musculoskeletal symptoms. Our study showed that 77.8 % of the respondents suffered from at least one musculoskeletal pain at the back, shoulder, foot, ankle, knee, hand or wrist. The most common symptoms were
pain over the back and wrist. Therefore, it is necessary to improve on both posture and “canting” tools in order
to provide a maximum comfort to the workers and consequently enhance the productivity
Aquaponic recirculation system: Asustainable food source for the future water conserves and resources
No full textDeveloping sustainable food sources to meet the demands of a growing population is a challenge. The current and escalating extent of soil degradation, water scarcity and climate-related challenges plaguing agricultural productivity, demands for re-evaluation the way of food production. Aquaponics is a concept relatively new to modern food production methods and can contribute to food security. The technology combines the aquaculture and hydroponics to yield a method of food growing that greatly reduces the use of water resources and produces fresh and nutritious crops in the form of vegetables and fish. This study was carried out at an average inflow rate of 1.28 m/day to evaluate the performance of aquaponics recirculation system (ARS) on nutrients removal and growth and production of African catfish as well as water spinach. A special design of ARS was used to provide nitrification of fish wastewater, where combination of sands and gravels in hydroponics trough, providing both surfaces for biofilm growth and cultivation area for plants. Removal efficiencies for 5-day biochemical oxygen demand (BOD5), total suspended solids (TSS), total ammonia nitrogen (TAN), nitrite-nitrogen (NO2-N), nitrate-nitrogen (NO3-N), and orthophosphate (PO43-) were 82%, 89%, 93%, 94%, 81%, and 80%, respectively. The feed conversion ratio (FCR) and specific growth rate (SGR) of African catfish was 1.08 and 3.34% day-1, respectively. The average water spinach production was 3.56 kg per m2. This study showed that ARS is a method of producing crop along with a healthy protein source and among the best alternatives for achieving economic and environmental sustainability
Moringa oleifera seed derivatives as potential bio-coagulant for environmentally microalgae chlorella sp. harvesting
No full text- …
