Najihah Abdul Rashid
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Preferred name
Najihah Abdul Rashid
Official Name
Najihah Abdul , Rashid
Alternative Name
Rashid, Najihah Abdul
Rashid, N. A.
Rashid, N.
Main Affiliation
Scopus Author ID
57203142293
Researcher ID
HVA-6875-2023

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Influence of leachate matrix on oxidation performance of ozonation and aops

2022-12-15 , Kow Su Huan , Fahmi Muhammad Ridwan , Che Zulzikrami Azner Abidin , Najihah Abdul Rashid , Naimah Ibrahim , Abdul Haqi Ibrahim , Ong Soon An , Wikurendra E.A. , Handayani D.

Landfill leachate is a critical environmental issue that should be adequately treated to prevent it from spreading to the environment. This study explored the influence of raw leachate matrix and treated leachate matrix on O3, O3/H2O2, and O3/PS performance. O3 and AOPs were conducted in a laboratory-scale batch reactor. The findings showed the degradation of p-cresol, COD, and humic substances was much slower in treated leachate matrix than in raw leachate matrix. However, color was found easier to remove in treated leachate. The results revealed a synergic effect between molecular O3 and dissolved organic matter in the raw leachate as the O3 performance was enhanced in the presence of raw leachate matrix, except for color removal. The highest degradation of more than 90% was achieved in O3 /H2 O2 to remove COD, p-cresol, and humic substances, although it is the most affected by the leachate matrix. This study provides vital insight into the notable performance of O3 /PS in color removal regardless of the influence of leachate matrix, suggesting that the sulfate radical-induced oxidation outperformed O3 and O3 /H2 O2 in reducing nitrogen-containing compounds.

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Investigation of Biosand Filter (BSF) on the Treatment Performance of Industrial Latex Wastewater

2024-01-01 , Najihah Abdul Rashid , Abdul Latif Abdul Rani , Mohd Firdaus Omar , Zainol N.A. , Salwa Mohd Zaini Makhtar , A B Wahab M. , Nabilah Aminah Lutpi , Farrah Aini Dahalan

Biosand Filters (BSF) has great potential to improve the water quality. BSF is used extensively in the treatment of drinking water in rural areas because it is affordable, simple to use, and has a high removal efficiency. This study used actual latex effluent to examine the effectiveness of SBR. The growth of the biolayer in the BSF is also observed. This study analyzes consistent and stable results for COD, DO and NH4-N+. With removal performance ranging from 87 % to 99 %. DO value for BSF varied from lowest value of 1.5 mg/L to 8mg/L. Overall, the BSF was capable of producing treated water for water reclamation.

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Effect of Cycling Time Strategy on the Treatment of Industrial Latex Wastewater with Granular Sludge

2020-07-09 , Najihah Abdul Rashid , Abdul Latif Abdul Rani , Omar M.F. , Abdullah M.A.H.

Effects of cycling time on the performance of granular sludge in sequencing batch reactors (SBR) were evaluated. Two reactors, reactor 1 (R1) and reactor 2 (R2) was introduced to industrial wastewater with varying chemical oxygen demand (COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. However granules in R1 utilizes cycling time of 24 hours whilst R2 utilizes cycling time of 4 hours. The overall performance for both reactors were excellent, where COD removal efficiency was kept at about 78 % to 98 % removal. Although higher COD removal was observed for both reactors, granulation did not occur in R1 when applying cycling time of 24 hours. In contrast to R2, decrement of cycling time to 4 hours promotes the growth of dense and structured sludge granules.

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Real-Time Flood Monitoring System Using Raspberry PI

2020-12-18 , Fairuz M.F.M. , Mohamad Rizal Abdul Rejab , Rohani S Mohamed Farook , Aznor Hanah Abdul Halim , Najihah Abdul Rashid , Rifaat M.N.M.

Flood has been a major concern for a very long time and the inability to monitor it in real-time has been a major disadvantage in maintaining a healthy hydrologic process. The main problem in monitoring flood is the amount of time taken for data to reach users and how long the data is relevant for as in monitoring flood, timing is the crucial key. This research proposes a Real-Time Flood Monitoring System that can aid in monitoring flood more efficiently. The system utilizes a set of sensors connected to a single-board computer that determines values in which is vital in monitoring flood. To ensure a fast transmission of data, the values are transferred over Wide Area Network (WAN) to host these values on a remote server. The remote server hosts these data on a website and application which is made accessible for the public with an ease of access. As a result, it can be viewed by users who wish to know the necessary values in determining danger level and further actions can be taken in ensuring their safety. Data which is transferred on real-time allow less time to be taken in order for the news to spread around as time is very crucial in saving people from natural disasters. These data also have a great importance for safety enforcement to be used in determining safety precautions that can be taken in order to ensure the safety of people around a particular area.

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Development of aerobic granular sludge using industrial latex wastewater

2015 , Najihah Abdul Rashid

An attempt of developing aerobic granules using industrial latex wastewater sludge was conducted. Optimization of cycling time were investigated and assessment of the effect of fluctuating organic loading was performed. Subsequently followed by investigation of physical characteristics of a stable aerobic granules under inconsistent and constant organic loading. Finally, aerobic granular sludge produced was then characterized by a height to diameter ratio (H/D) of 2.7 and 14. Experimental investigation was conducted in sequencing batch reactors R1, R2, R3 and R4 with cycling time of 4 hours after selection of cycling time was conducted based on preliminary investigation. Four batches of experiment were performed to support the objectives of this study. Similar size of sludge flocs was inoculated to all four reactors with reactor configuration of 2.7 and 14 together with various organic loading rate. R1 and R3 was introduced to real latex wastewater with varying chemical oxygen demand (COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. However, granules in R1 were cultivated with superficial air velocity (SAV) of 4.25 cm/s, whereas granules R3 utilized SAV of 1.1 cm/s. R2 and R4 was fed with synthetic wastewater with consistent COD loadings of 0.07 kgCOD/m3/d but with different application of SAV. All four reactors achieve granulation, although granules developed in R1 and R3 is bigger and denser than in R2 and R4. But when compared to granules grown in R1 and R3, R2 and R4 granules were less compact and smaller in size. R2 and R4 granules can reach granule size of 0.2 to 0.6 mm within 210 days, compared to R1 and R3 granules that can only developed up to 4.75 mm within 150 days. This result shows significant difference between R1 and R3 with R2 and R4 granules, and that COD loadings appear to be a crucial factor for complete granulation. When R1 granules were compared to granules in R3, an apparent difference of granules characteristics were observed with a high average settling velocity (SV) value in R3 than in R1. On the other hand, R2 and R4, displayed unstable development of granules throughout the study but stable reactor performance after formation of granules. Utilization of a constantly low organic loading rate (OLR) does not seem to favour a stable granules formation, although high height to diameter ratio was applied to enhance the SAV within the reactor in order to intensify shear force optimizing the formation of a more stable and compact granules.

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Influence of leachate matrix on oxidation performance of ozonation and aops

2022-12-15 , Kow S.H. , Fahmi Muhammad Ridwan , Che Zulzikrami Azner Abidin , Najihah Abdul Rashid , Naimah Ibrahim , Abdul Haqi Ibrahim , Ong Soon An , Wikurendra E.A. , Handayani D.

Landfill leachate is a critical environmental issue that should be adequately treated to prevent it from spreading to the environment. This study explored the influence of raw leachate matrix and treated leachate matrix on O3, O3/H2O2, and O3/PS performance. O3 and AOPs were conducted in a laboratory-scale batch reactor. The findings showed the degradation of p-cresol, COD, and humic substances was much slower in treated leachate matrix than in raw leachate matrix. However, color was found easier to remove in treated leachate. The results revealed a synergic effect between molecular O3 and dissolved organic matter in the raw leachate as the O3 performance was enhanced in the presence of raw leachate matrix, except for color removal. The highest degradation of more than 90% was achieved in O3 /H2 O2 to remove COD, p-cresol, and humic substances, although it is the most affected by the leachate matrix. This study provides vital insight into the notable performance of O3 /PS in color removal regardless of the influence of leachate matrix, suggesting that the sulfate radical-induced oxidation outperformed O3 and O3 /H2 O2 in reducing nitrogen-containing compounds.

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Aerobic granules cultivated using industrial rubber wastewater: Effect of size distribution and Performance of granules.

2020-12-18 , Najihah Abdul Rashid , Abdul Latif Abdul Rani , Mardhiah Farhana Omar , Muhd Afiq Hizami Abdullah

Sequential batch reactors (SBR) have been successfully developed granular sludge using industrial rubber wastewater on a cylindrical shaped SBR. SBR was introduced to industrial wastewater with varying chemical oxygen demand (COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. First phase of experiment utilized 24 hours cycle time whilst second phase of experiment utilized 4 hours cycle time. Granules were successfully developed at the second phase (4 hours) of experiment. Fortunately, the overall performance for both cycles were excellent. COD removal efficiency throughout the experiment was kept at about 78 % to 98 %. Although higher COD removal was observed for both cycle, granulation did not occur in the first phase (24 hours). Decrement of cycling time to 4 hours promotes the growth of dense and structured sludge granules.

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Studies on factors affecting unconfined compressive strength of industrial rubber sludge containing heavy metals treated using ordinary Portland cement via stabilization/solidification technique

2020-12-18 , Abdul Latif Abdul Rani , Najihah Abdul Rashid , Muhd Afiq Hizami Abdullah , Mohd Firdaus Omar , Salim A.S. , Anuar N.A.I.

High concentration of selected heavy metals within industrial rubber sludge collected from rubber industry wastewater treatment plant has classified the waste as scheduled waste. Special treatment to the waste by using ordinary Portland cement via solidification/stabilization (S/S) technique has been performed in laboratory scale. The objective of this research is to determine related factors that affect unconfined compressive strength (UCS) performance of stabilised/solidified (s/s) cube specimens which contains industrial rubber sludge waste. Other parameters observed include the curing condition (i.e. air and water immersion curing method), waste composition, specimen age and density. The prepared fresh mix were cast in plastic moulds in order to produce 50 mm3 cubical shape specimens and leaved to set approximately 24 to 48 hours. The prepared specimen batches are S1 (90% OPC + 10% waste), S2 (70% OPC + 30% waste), S3 (50% OPC + 50% waste). UCS was performed on respective specimen age of 7 and 28 days. Positive results were obtained as relatively the average compressive strength of 7 day air cured specimens reach 5.25 MPa, 5.28 MPa, and 2.16 MPa for S1, S2 and S3.While, 28 days air cured specimens results are 9.59 MPa, 8.01 MPa, and 1.46 MPa for S1, S2, and S3 respectively. As for water immersion, the compressive strengths are 8.19 MPa, 4.93 MPa, and 1.90 MPa for 7 days, and 7.75 MPa, 10.10 MPa, and 2.11 MPa for 28 days at respective S1, S2 and S3 sequence. As conclusion, the specimens prepared passed the minimum requirement for secured landfill disposal which is at 1 MPa.

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Analysis of lead (Pb) leaching from stabilized/solidified sample containing rubber sludge waste treated using ordinary Portland cement and rice husk ash

2022-11-18 , Abdul Latif Abdul Rani , Najihah Abdul Rashid

Lead (Pb) contaminated sludge originating from industrial rubber wastewater treatment has become a serious problem if been direct disposed in landfill. Lead has been recognized as harmful toxic heavy metals and capable to cause carcinogenic effect to human and other living creatures. The leaching of Pb from this waste can leads to more severe environmental problem associated with the contribution by water run-off, groundwater and surface water contaminations. An attempt to treat the rubber sludge using ordinary Portland cement and rice husk ash using stabilization/solidification technique has been performed in this study. Objective of this study is to evaluate the effectiveness of ordinary Portland cement and rice husk ash mixtures in reducing the leachability of lead in stabilized/solidified specimen. Based on the findings, it is revealed that lead from leaching of sample batches prepared (i.e. OWR1, OWR2 and OWR3) have successfully reduced as compared to the control batches. The combination of ordinary Portland cement and rice husk ash were proven to reduce the leaching of lead into the leachant closed to acceptable limit which was at 15?ppm.

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Competitiveness of Industrialised Building System (IBS) and Conventional Method in Construction Industry in Terms of Quality

2023-10-04 , Mardhiah Farhana Omar , Muhd Afiq Hizami Abdullah , Najihah Abdul Rashid , Fatt H.L. , Abdul Latif Abdul Rani , Ishak H.

Construction quality is defined as the achievement of a satisfactory level of performance in construction work. One of the variables considered in the management of construction projects is quality. The quality of the building can be determined by its performance and compliance with all applicable requirements. However, the construction sector is facing difficulties because the quality of several projects has fallen short of expectations. As a result, the problem of lack of attention to construction quality must be addressed. Therefore, the objective of this study is to identify the elements that affect construction quality in the construction sector when IBS are used compared to conventional techniques, as well as to evaluate the success of construction with IBS compared to conventional methods in terms of quality. The final objective is to evaluate the link between the elements affecting the building quality in the Industrial Building System (IBS) and the conventional technology, as well as the quality success of the building. In this study, the quantitative analysis was conducted through questionnaire surveys that included the G7 construction companies in Selangor interested in building quality. Stratified random sampling approach was used in this study. QLASSIC was conducted by 130 Class 7 contractors from Selangor registered with the CIDB. This means that 97 people from the population are needed to complete the questionnaires. The results suggest that the most important elements affecting construction quality are that the construction of IBS components is not affected by extreme weather conditions because the prefabricated components are manufactured in a controlled environment, unlike the traditional technique. In addition, unlike traditional methods, IBS requires the use of professional personnel to install the structural components. As a result, the quality of a building can increases and defects can be reduced if it is successful. The importance of this study is that it will help contractors improve their quality on certain jobs and reduce unsatisfactory results in the future.

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