Hassimi Abu Hasan

Universiti Kebangsaan Malaysia | ukm · Department of Chemical and Process Engineering

Aquaculture sector plays important role for the economic development in Malaysia, but environmental concerns are arising due to the pollution caused by the discharge of untreated wastewater. Coagulation-flocculation-sedimentation is currently the best practice of aquaculture wastewater treatment. This research aims to compare the performance of che...

The environmental impacts of aquaculture wastewater and biowaste from shellfish processing have become a major challenge to aquaculture expansion and sustainability. There is need to develop measures for the wastewater treatment and proper recycling of the biowaste. In this study, dry legs of giant freshwater prawn (Macrobrachium rosenbergii) were...

The major sources of waste from aquaculture operations emanates from fish or shellfish processing and wastewater generation. A simple technique called coagulation/flocculation utilizes biowaste from aquaculture to produce chitosan coagulant for wastewater treatment. A chemical method was applied in the present study for chitin and chitosan extracti...

Domestic wastewater contains various organic and inorganic substances that need to be treated using appropriate technology. Phytotechnology is one of the technologies that have high efficiency in removing contaminants. Thus, this study aims to analyze the potential of Pistia stratiotes, as a floating plant, in removing various contaminants in domes...

The negative impacts of aquaculture wastewater can best be curtailed by sustainable treatment before discharge. As far as environmental safety is concerned, there is no safer place where floc recovered from the treatment of aquaculture wastewater can be disposed. Therefore, it has become imperative to find a more sustainable way of recycling the fl...

Unless better measures are put in place to address the environmental and social impacts emanating from the huge waste generated from sea food processing industries; ‘tragedy of the commons’ is inevitable. Needless to re-emphasise the enormous contributions of aquaculture as the perfect substitute to capture fisheries which has been proven unsustain...

The adsorption process of reactive blue 49 (RB49) dye and reactive red 195 (RR195) dye from an aqueous solutions was explored using a novel adsorbent produced from the sunflower husks encapsulated with copper oxide nanoparticle (CSFH). Primarily, the features of a CSFH, such as surface morphology, functional groups, and structure, were characterize...

This study aimed to evaluate the effectiveness of plant-based coagulant extracted from Leucaena leucocephala seeds compared with alum in removing solids from aquaculture wastewater. Water-extraction method was used to extract the active ingredients from the seeds by dissolving the seeds' powder in distilled water at 20 g/L concentration, whereas al...

Contaminants of emerging concern (CECs) are primarily anthropogenic compounds found in water at trace concentrations and mostly still ignored. Pharmaceuticals and personal care products (PPCPs) are two popular categories of CECs. PPCPs are persistent in the environment and capable of disrupting the physiology of target receptors. PPCPs are reported...

MIkroalga mendapat perhatian kerana kebolehupayaannya untuk hidup dalam persekitaran yang tercemar. Mikroalga merupakan mikroorganisma yang menggunakan sebatian-sebatian karbon, nitrogen dan fosforus untuk pertumbuhan, sekaligus merawat efluen. Efluen kilang kelapa sawit (POME) merupakan efluen yang terhasil daripada proses pengekstrakan minyak saw...

Phytoremediation was used in this study to polish treated palm oil mill effluent using Azolla pinnata. The effectiveness of phytoremediation using A. pinnata can be proved through the reduction of the contamination concentration of wastewater before and after treatment. Preliminary study was made to determine the range of variables that are require...

This study concerns the role of activated carbon (AC) from palm raceme as a support material for the enhancement of lipase-catalyzed reactions in an aqueous solution, with deep eutectic solvent (DES) as a co-solvent. The effects of carbonization temperature, impregnation ratio, and carbonization time on lipase activity were studied. The activities...

In this study, we proposed three vegetated constructed wetlands (CWs) together with a non-vegetated CW acting as a control in a continuous sub-surface flow system (CSSFS) designed for the remediation of mixed pharmaceuticals (ibuprofen and paracetamol with concentrations of 600 and 60 μg/L, respectively) spiked in domestic wastewater and operated a...

Heavy metal wastes, particularly hexavalent chromium [Cr(VI)], are generated from anthropogenic activities, and their increasing abundance has been a research concern due to their toxicity, genotoxicity, carcinogenicity and mutagenicity. Exposure to these dangerous pollutants could lead to chronic infections and even mortality in humans and animals...

Palm oil mill effluent (POME) is a wastewater generated from palm oil industries that rich with organic and nutrients which can becomes an excellent substrate for biogas production. A comprehensive study was carried out to study the effect of different ratio of inoculum to POME substrate for biogas production. In addition, the removal efficiencies...

Chitosan is a biopolymer compound which is made up of β-1,4 glycosidic bonds. Due to its peculiar nature, chitosan has found applications in science and engineering, food processing, medicine, agriculture and wastewater treatment. Isolation of chitin and chitosan from dry powder shell of Penaeus monodon was achieved through chemical treatment with...

Due to accelerating global efforts toward decarbonization, a clean hydrogen (H2) producing technology, Microbial Electrolysis Cell (MEC), has garnered considerable attention. However, MEC's external energy requirement has raised concerns about its sustainability, scalability and application costs. The objective of this research was to build a renew...

Microalgae have been identified as one of the new feedstocks for renewable energy production. The conversion of microalgae into various valuable products has also been increasing in the last decade. Microalgae harvesting, one of the most important stages in microalgae production, has been studied and reviewed by many researchers. However, most harv...

Natural materials have a high potential to be used as coagulant/flocculant owing to the problems of inorganic materials. Petai belalang (Leucaena leucocephala) is a widely abundant plant in Malaysia and very efficient as a plant-based coagulant in previous research. This research investigated the effectiveness of seeds of L. leucocephala in removin...

Bioflocculants gain attention as alternatives to chemical flocculants because they are more environmentally friendly and highly biodegradable. This study aims to improve the bioflocculant production by Serratia marcescens using one-variable-at-a-time (OVAT) analysis and analyze its flocculating activity performance, toxicity , and the flocculation...

Extensive growth of industries leads to uncontrolled ammonia releases to environment. This can result in significant degradation of the aquatic ecology as well as significant health concerns for humans. Knowing the mechanism of ammonia elimination is the simplest approach to comprehending it. Ammonia has been commonly converted to less hazardous su...

The increasing intensification of the aquaculture industry requires the development of new strategies to reduce the negative impacts of wastewater on the environment. Plant-based coagulants/flocculants, regarded as one of the environmentally friendly technologies for wastewater treatment, show good performance in the removal of suspended solids fro...

The coffee processing industry produces toxic and low biodegradable effluent, which can pollute water bodies. A pre-treatment study on coffee effluent using a dual-media biofilm reactor (DM-BR) containing sand and Hexafilter (HEX) was conducted alongside a control biofilm reactor (C-BR) containing sand media. The novelty of this study lies in the u...

Aquaculture effluent contributes to surface water pollution. Coagulation, flocculation, and sedimentation are currently the best practices in aquaculture effluent treatment, and the utilization of chemical coagulants or floc-culants is still dominant in assisting the treatment processes. This research aimed to analyze the potential of the bacteria-...

Native emergent and floating plants; local reed grass (Phragmites karka) and water hyacinth (Eichhornia crassipes), respectively, were used to treat textile wastewater using an integrated emergent-floating planted reactor (IEFPR) system at hydraulic retention times (HRTs) of 8, 14, and 19 days. Real textile effluent having characteristics of 1686.3...

Ammonia-oxidising bacteria (AOB) consortium has attracted attention considering the cost savings in wastewater treatment. The study aims to optimise the composition of the AOB consortium for ammonia removal. AOB bacteria were isolated from the activated sludge of a coffee effluent bioreactor. All isolates were cultivated in a mineral salt medium co...

Microbial electrolysis cells (MECs) are a new bio-electrochemical method for converting organic matter to hydrogen gas (H2). Palm oil mill effluent (POME) is hazardous wastewater that is mostly formed during the crude oil extraction process in the palm oil industry. In the present study, POME was used in the MEC system for hydrogen generation as a...

In this study, a new adsorbent derived from sunflower husk powder and coated in CuO nanoparticles (CSFH) was investigated to evaluate the simultaneous adsorption of Levofl oxacin (LEV), Meropenem (MER), and Tetracycline (TEC) from an aqueous solution. Significant improvements in the adsorption capacity of the sunflower husk were identified after th...

The application of plant-based coagulants in wastewater treatment has increasingly progressed in the coagula-tion-flocculation process toward green economy and cleaner production. Plant-based coagulants have a potential as essential substitutes for commercially used chemical coagulants because of their natural characteristics and biodegradability....

Bioaugmentation, the addition of cultured microorganisms to enhance the currently existing microbial community , is an option to remediate contaminated areas. Several studies reported the success of the bioaugmentation method in treating heavy metal contaminated soil, but concerns related to the applicability of this method in real-scale applicatio...

A good bioflocculant-producing bacteria (BPB) was isolated from water sample collected from river sediment. This BPB was identified as Bacillus velezensis isolate JB7 based on 16S rDNA gene sequence and demonstrated maximum flocculating activity of 92.3% toward kaolin suspension compared to other 34 isolates. This isolate JB7 had a circular shape w...

The contamination of aquaculture products and effluents by contaminants of emerging concern (CECs) from the direct chemical use in aquaculture activities or surrounding industries is currently an issue of increasing concern as these CECs exert acute and chronic effects on living organisms. CECs have been detected in aquaculture water, sediment, and...

A reedbed system planted with Phragmites australis was implemented to treat chlorinated hydrocarbon-contaminated groundwater in an industrial plant area. Reedbed commissioning was conducted from July 2016 to November 2016 to treat contaminated groundwater via a pump-and-treat mechanism. Combination of horizontal and vertical reedbed systems was app...

A pressing concern of issues such as climate change has drawn main attention in the world. The burning of fossil fuels by human due to increasing energy demand in various sectors is one of the main factors that influence the climate change. This has resulted in the introduction of many renewable energy sources as alternatives to fossil fuels. Bioga...

In this study, biosurfactant-producing fungi isolated from crude oil sludge were tested to degrade total petroleum hydrocarbons (TPHs) in contaminated sludge. Polymerase chain reaction (PCR) was performed, and the phylogenetic tree based on the fungi genomic sequence was constructed using MEGA-X software and had identified the isolated fungi as Asp...

A phytoremediation experiment was carried out with kerosene as a model for total petroleum hydrocarbons. A constructed wetland of barley was exposed to kerosene pollutants at varying concentrations (1, 2, and 3% v/v) in a subsurface flow (SSF) system. After a period of 42 days of exposure, it was found that the average ability to eliminate kerosene...

The crisis on water resource and environmental pollution are forcing to upgrade conventional technology of wastewater treatment for water recycle and reuse. Coagulation-flocculation is the common wastewater treatment that has shown efficient removal performance based on various coagulants from metal-to plant-based compounds. Dosage application is t...

Batik is well known as one of the unique identifiers of the Southeast Asian region. Several countries that still preserve the batik heritage are Malaysia, Indonesia, China and India. The Batik industry holds a significant place in Malaysia's craft-based industry. In Malaysia, batik motifs and patterns are mostly hand-drawn and painted directly on f...

Treated effluent from a wastewater treatment plant can be further reused as a water resource for a water supply treatment plant. In this case, the treated sewage gathered in the study of the Class V National Water Quality Standard (NWQS) of Malaysia would be treated for use as a water resource for a water treatment plant. In a moving bed biofilm re...

The performance of local plants was tested using synthetic turbid water resembling real wastewater by measuring their ability to remove turbidity. The selected plants were A. indica, S. palustris, D. linearis, S. polyanthum, M. esculenta, P. sarmentosum, and M. malabathricum which can easily be found locally. The experiment was run based on coagula...

A reedbed system planted with Phragmites australis was implemented to treat chlorinated hydrocarbon-contaminated groundwater in an industrial plant area. Reedbed commissioning was conducted from July 2016 to November 2016 to treat contaminated groundwater via a pump-and-treat mechanism. Combination of horizontal and vertical reedbed systems was app...

This study was conducted to identify the ability of two of Malaysia's native tropical plants (Scirpus grossus and Eichhornia crassipes) to survive in real textile industry wastewater with COD content up to 1391 mg/L. Wastewater sample was taken from textile industry factory plant located in Kepong, Kuala Lumpur. S. grossus and E. crassipes plants w...

The interaction among operating parameters of moving bed biofilm reactors (MBBR) in a treating palm oil mill effluent (POME) was carried out in order to determine the maximum chemical oxygen demand (COD) and ammoniacal-nitrogen (NH3-N) removal. To achieve these goals, a face-centred central composite design was applied to the hydraulic retention ti...

Biocoagulants and bioflocculants are alternative items that can be used to substitute the utilization of common-chemical coagulants and flocculants. Biocoagulants/bioflocculants can be extracted from animals, microorganisms , and plants. Moreover, biocoagulants/bioflocculants have specific characteristics that contribute to the co-agulation and flo...

Azadirachta indica, or Neem, is a natural plant commonly used in medicine and pesticides due to the useful compounds it contains. This study aimed to determine the performance of Neem leaves as a natural coagulant in the removal of turbidity, total suspended solids (TSS) and colour from real aquaculture effluent. The experiment was conducted to det...

Bisphenol A (BPA) is widely used in everyday life and can be found everywhere, including in the ecosystem and manufactured goods. BPA not only has a negative impact in low doses, but it also has biological and pathophysiological implications for obesity and hormonal effects. The objectives of this paper were to review the BPA removal technology and...

In this study, we explored the ability of wild-Serbian Ganoderma lucidum mycelial pellets (GLMPs) in treating synthetic domestic wastewater in a batch reactor under various operating conditions. The GLMPs produce non-hazardous by-products, are environmentally sustainable and able to produce in mass bulk with consistent quality. Riding on the highly...

This study aimed to assess the efficiency of Nerium oleander in removing three different metals (Cd, Cu, and Ni) from simulated wastewater using horizontal subsurface flow constructed wetland (HSSF-CW) system. The HSSF-CW pilot scale was operated at two hydraulic retention times (HRTs) of 4 and 7 days, filled with a substrate layer of sand and grav...

Biosurfactant produced by rhizobacteria has the potential to enhance the degradation of hydrocarbons, leading to more efficient phytoremediation. The aim of this work was to search for bifunctional hydrocarbon-degrading and biosurfactant-producing rhizobacteria. Isolation of bacteria was conducted from three sources (A: rhizosphere of Scirpus gross...

Phytoremediation is an alternative technology for treating domestic and industrial wastewater. Coffee wastewater contains high value of biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS) and turbidity. The wastewaters also possess a distinctive dark brown colour with acidic medium characteristic. This researc...

Fisheries, one of the growing sectors in Malaysia, contribute a notable percentage to the national gross domestic product. The fisheries sector rapidly and dynamically grew throughout the past three decades. Aquaculture commodities are currently providing remarkable contributions to the fisheries sector, overcoming the previous dominance of traditi...

A hybrid treatment system of multimedia-sequencing batch biofilm reactor (MM-SBBR; B) and three control bioreactors (C, D, E) processing synthetic wastewater containing pentachlorophenol (PCP), were used to study the effectiveness of PCP removal and the impact of high-levels of PCP (100 mg L − 1) on bacterial community compositions. Another MM-SBBR...

Pharmaceutical compounds in wastewater are currently becoming emerging concern as the utilization of drugs in anthropogenic activities. This research analyzed the effectiveness of pilot-scale vertical subsurface flow constructed wetland (VSSFCW) planted with Scirpus grossus using an aeration system for simultaneous removal of ibuprofen, chemical ox...

Turbidity is a common pollutant parameter in water and wastewater treatment that can be reduced through flocculation. This research was conducted to characterise and analyse the potential of bioflocculant-producing bacteria isolated from aquaculture effluent. Samples were taken from two different aquaculture farms that represent brackish and freshw...

The fungi-based technology, wild-Serbian Ganoderma lucidum (WSGL) as myco-alternative to existing conventional microbial-based wastewater treatment is introduced in this study as a potential alternative treatment. The mycoremediation is highly persistent for its capability to oxidatively breakdown pollutant substrates and widely researched for its...

Modeling and simulation were developed of the continuous catalytic regeneration reforming process for integrating four reactors and studying the effecting operating parameters to improve the process performance. The process model included four reactors as stack and used to investigate the profiles of reformate composition products and research octa...

Phytoremediation is an environmentally friendly technique in wastewater treatment because of its sustainability, cost-effectiveness, and simplicity. This study was conducted to examine the feasibility of use of Lepironia articulata, a potential phytoremediation plant that is native to Malaysia, in remediating coffee processing mill effluent (CPME)....

The content of organic material which is not easily degraded in Benowo landfill leachate is quite high and it makes microorganisms difficult to degrade waste. One of the methods that can be used to reduce organic load is by optimizing the processing of coagulation flocculation using PAC coagulant and chitosan flocculant. This study aims to reduce t...

The aquaculture industry has become increasingly important and is rapidly growing in terms of providing a protein food source for human consumption. With the increase in the global population, demand for aquaculture is high and is estimated to reach 62% of the total global production by 2030. In 2018, it was reported that the demand for aquaculture...

This study was carried out to investigate the potential of Scirpus grossus in polishing final discharge of palm oil mill effluent (POME). The removal of total suspended solids (TSS) and chemical oxygen demand (COD) from POME by S. grossus was conducted in two different flow systems: a sub-surface (SS) and a free-surface (FS) batch constructed wetla...

Macrophytes have been widely used as agents in wastewater treatment. The involvement of plants in wastewater treatment cannot be separated from wetland utilization. As one of the green technologies in wastewater treatment plants, wetland exhibits a great performance, especially in removing nutrients from wastewater before the final discharge. It in...

Sago mill effluent (SME) contains high levels of organic material that can be reused as feedstock for a nutrient source in polymeric bioflocculant fermentation. In this study, SME was reused for bio-based polymeric flocculant or bioflocculant production and was optimised using central composite design (CCD) to obtain a high yield of bioflocculants,...

Hydrogen sulfide (H2S) should be removed in the early stage of biogas purification as it may affect biogas production and cause environmental and catalyst toxicity. The adsorption of H2S gas by using activated carbon as a catalyst has been explored as a possible technology to remove H2S in the biogas industry. In this study, we investigated the opt...

This study investigated the effect of co-culturing microalgae with a floc-forming bacterium. Of the six microalgae isolated from a biofloc sample, only Thalassiosira weissflogii, Chlamydomonas sp. and Chlorella vulgaris were propagated successfully in Conway medium. Hence, these species were selected for the experiment comparing microalgae axenic c...

The utilisation of chemical flocculants in water and wastewater treatment has drawn several concerns especially in terms of further toxicity and its effect to the environment. The utilisation of chemical flocculants produces non-biodegradable and hazardous sludge as by-product of the treatment. Bioflocculants are observed as an alternative to chemi...