19 research outputs found
Distributions of organochlorine pesticides in sediment and aquatic biota: Benzenehexachlorides (BHCS) / Azlina Mat Saad and Fadli Fizari Abu Hassan Asari
No full textThe usage of organochlorine pesticides (OCPs), which is also known as persistent organic pollutants (POPs), is either prohibited or restricted. However, a number of studies on sediments and aquatic biotas including fish and shellfish revealed that most of the compounds for instance Benzenehexachlorides (BHCs) group are still present in the
environment. Aquatic biotas can be used as bioindicator to monitor the concentrations of BHCs in the aquatic systems
such as rivers and oceans. At the same time, sediments can also be used to investigate the existence of BHCs in the
environment. Sediments serve as a home for benthic biota such as worms and clams, which are commonly consumed
by fish and benthic feeders. OCPs are easily absorbed on suspended particulate organic matter due to their high
octanol–water partition coefficient (Kow) which accumulated in bed sediments, which makes the sediments as potential contamination source
Metaldehyde: a brief on biodegradation and detection methods / Azlina Mat Saad
No full textMetaldehyde has been used to eradicate plant pests such as golden apple snails and
slugs. This toxic pesticide has adverse effects on the environment including human health
and animals. The biodegradation process naturally reduces the toxicity of this harmful
pesticide, but in a long term. Many studies have been conducted in analysing the
biodegradation process in water and soil. In addition, various methods have been proposed
in detecting this pesticide, especially in the aquatic environment. Both biodegradation and
detection are essential fields in ensuring the sustainability of our environment. This paper
gives a brief idea on both concepts, and works as a platform for young researchers in the
environmental pollution
Nine treatments of Metaldehyde in water / Azlina Mat Saad..[et al.]
No full textMetaldehyde is widely applied in the agricultural sector, largely in the removal of snails and slugs. Its water-soluble characteristic causes the compound to end up in our watery
system. This is very dangerous as it is able to pollute drinking water and food source; thus adversely affect our health. Hence, removing metaldehyde is an important task for those
involved with the treatment of water. For this reason, this paper gathers nine various methods which are proposed and used in treating water contaminated with metaldehyde.
The simple but significant explanation will be able to assist those who are new in the fields of pesticide removal and water treatment. In parallel, it will be the basis for more advanced researches in the future
Penggunaan kaedah ‘Pass The Marker!’ dalam pengajaran dan pembelajaran (P&P) subjek ekonomi / Fadli Fizari Abu Hassan Asari and Azlina Mat Saad
No full textSubjek-subjek ekonomi kaya dengan pelbagai jenis gambarajah dan persamaan. Justeru, lakaran graf dan penyelesaian persamaan adalah kemahiran-kemahiran asas yang perlu dikuasai para pelajar. Bagaimanapun, kaedah pengajaran yang terlalu menggunakan slaid, adakalanya menyekat perkembangan
kemahiran-kemahiran asas ini. Justeru kaedah ‘Pass the Marker!’ telah diperkenalkan oleh penulis. Kaedah seakan ‘Chalk and Talk’ ini digunakan bersama konsep-konsep lain seperti Ekono‘Cinta’Metrik, Ekono‘Cinta’ dan Ekono‘Raya’. Ianya didapati berjaya memberikan pemahaman yang kukuh selain mengurangkan kadar kegagalan subjek secara drastik. Selain itu kaedah ini berjaya membantu para pelajar memenangi pingat di pertandingan inovasi. Juga, tugasan kelas para pelajar berjaya diangkat sebagai kertas kerja di persidangan antarabangsa. Kesemuanya bermula dengan kaedah ‘Pass the Marker!’ ini
Aerobic granules in lab-scale bioreactor: a focus on size distribution and settling velocity properties / Azlina Mat Saad... [et al.]
No full textBiogranulation technology using aerobic granules is one of the most important discoveries in the field of wastewater treatment. This advanced technology is better than conventional wastewater treatment method because it is cost-effective and space-reduced. The evolution of aerobic granules from seed sludge to granules in sequencing batch reactor system was studied in this study. The purposes of this study are to measure the size of aerobic granules over time and to determine the settling velocity of the aerobic granules against time. The sequencing batch reactor system was operated in four processes involved feeding, aeration, settling and withdraw. The bioreactor was inoculated with seed sludge sample taken from wastewater treatment plant in Arau, Perlis and run at room temperature. Synthetic wastewater containing acetate and other elements were used to feed the biomass in the bioreactor system. The aerobic granules started to be detected in the sequencing batch reactor after two weeks of operation. The aerobic granules in size categories (>0.20.40.6 mm) had increased over the time. An increase of settling velocity (29.8 m/h) was observed in this present study. These findings demonstrate that the increase of aerobic granules size and settling velocity were important in determining the evolution of aerobic granules study
Development of aerobic granules using Sequencing Batch Reactor (SBR): a proposed workflow / Azlina Mat Saad ... [et al.]
No full textThis study highlights on the development of aerobic granules using sequencing batch reactor (SBR). The development involves four phases; fill, aerate, settle, and draw in every cycle. In easing the understanding; the flowchart, schematic diagram, and list of equipment are presented in this paper. Sampling is another important stage in completing the process. In addition, the composition of synthetic wastewater including nutrients and trace elements are detailed out in this paper. In monitoring the development of aerobic granules, several parameters should be measured consistently. As a guideline, expected results have been listed in ensuring the smoothness of the proposed workflow
Ikan keli as a potential bioindicator for organochlorine pesticides pollution in Malaysia / Azlina Mat Saad … [et al.]
No full textIkan keli or catfish is very synonym among Malaysian as a delicious cuisine. At the same time, less is known about its capability in becoming a bioindicator for Organochlorine Pesticides (OCPs) pollution. This is vital since most of the publications on OCPs pollution in Malaysia have used shellfish (mollusk, clam, oyster, mussel etc.) as samples. Availability is the main key, where this species is easily found in several type of water environment including river, swamp, lake, confluent and even paddy field. Scientifically known as Clarias batrachus, this species has been used as a bioindicator to investigate organochlorine pesticides (OCPs) groups namely DDTs, BHCs and Cyclodienes. In this study, samples have been selected from two different seasons which are monsoon and inter monsoon. Using Gas Chromatography Electron Capture Detector (GC-ECD), significant level of OCPs contamination has been detected. This result is similarly in range with other studies that used shellfish as their samples. From commercial perspective, this species can be reared in industrial water treatment pond. Low in maintenance cost and its resistant characteristic may assist industry in identifying their pollution level and looking for long term improvement. This will at the end contributing for better pollution management and sustainable development in Malaysia
Development of aerobic granules using Sequencing Batch Reactor (SBR): a proposed workflow
No full textThis study highlights on the development of aerobic granules using sequencing batch reactor (SBR). The development involves four phasesfill, aerate, settle, and draw in every cycle. In easing the understandingthe flowchart, schematic diagram, and list of equipment are presented in this paper. Sampling is another important stage in completing the process. In addition, the composition of synthetic wastewater including nutrients and trace elements are detailed out in this paper. In monitoring the development of aerobic granules, several parameters should be measured consistently. As a guideline, expected results have been listed in ensuring the smoothness of the proposed workflow
Aerobic granules in lab-scale bioreactor: a focus on size distribution and settling velocity properties
No full textBiogranulation technology using aerobic granules is one of the most important discoveries in the field of wastewater treatment. This advanced technology is better than conventional wastewater treatment method because it is cost-effective and space-reduced. The evolution of aerobic granules from seed sludge to granules in sequencing batch reactor system was studied in this study. The purposes of this study are to measure the size of aerobic granules over time and to determine the settling velocity of the aerobic granules against time. The sequencing batch reactor system was operated in four processes involved feeding, aeration, settling and withdraw. The bioreactor was inoculated with seed sludge sample taken from wastewater treatment plant in Arau, Perlis and run at room temperature. Synthetic wastewater containing acetate and other elements were used to feed the biomass in the bioreactor system. The aerobic granules started to be detected in the sequencing batch reactor after two weeks of operation. The aerobic granules in size categories (>0.20.40.6 mm) had increased over the time. An increase of settling velocity (29.8 m/h) was observed in this present study. These findings demonstrate that the increase of aerobic granules size and settling velocity were important in determining the evolution of aerobic granules study
Penyingkiran racun siput gondang emas menggunakan granulasi aerobik
No full textPeningkatan jumlah populasi siput gondang emas dalam sawah padisecara langsung telah meningkatkan penggunaan racun perosak iaitu metaldehyde. Sisa racun perosak yang telah digunakan akan berakhir di dalam sistem air yang merupakan sumber air dan habitat kepada hidupan akuatik. Manusia dan haiwan lain turut menerima impak negatif dengan pencemaran ini. Sisa racun terkumpul di dalam badan mampu merosakkan sistem saraf dan hati. Sebagai penyelesaian, kajian ini akan memantau keupayaan granul aerobik untuk menyingkirkan metaldehyde dari air sisa.Sebuah bioreaktor yang dikenali sebagai reaktor kumpulan penjujukan telah digunakan untuk membangunkan butiran aerobik. Sampel enapcemar diaktifkan diambil dari loji rawatan air sisa telah digunakan sebagai enapcemar benih untuk memulakan pembentukan granul aerobik.Biomas dalam enapcemar benih diberi makan air sisa sintetik yang terdiri daripada beberapa bahan kimia sebagai sumber karbon dan nutrien
