Flocculation behavior and mechanism of bioflocculant produced by Aspergillus flavus

Aljuboori, Ahmad H. Rajab; Idris, Azni; Al-joubory, Hamid Hussain Rijab; Uemura, Yoshimitsu; Abubakar, B. S. U. Ibn

doi:10.1016/j.jenvman.2014.12.035

Cited by 78 publications

(35 citation statements)

References 29 publications

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“…These myco-flocculants were more stable at moderate temperatures (range 25 o C and 35 o C). Similar findings were observed by Aljuboori et al [9], on the bioflocculant produced by Aspergillus flavus with a residual flocculating activity of about 93% at temperature range from 5 to 45 °C, thus indicating a thermostable bioflocculant. The result was similar to reported for the bioflocculant produced by Aspergillus parasiticus and it had moderate heat-stability [20].…”

Section: Compatible Mixed Culturesupporting

confidence: 89%

“…Similarly, Gong et al [8] reported Serratia ficaria produced bioflocculant SF-1 showed 91.8 -93.7% turbidity removal from wastewater, which is better than that of PAC and PAM. Aspergillus flavus produced IH-7 bioflocculant showed better flocculation performance than PAC and IH-7 was significantly used to flocculate different types of suspended solids such as activated carbons, kaolin clays, soil solids, and yeast cells [9]. Moreover, bioflocculants are widely used for the recovery of suspended solids (SS) from wastewater treatment [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Production and Stability of Myco-Flocculants From Lentinus Squarrosulus Rwf5 and Simplicillium Obclavatum Rwf6 for Reduction of Water Turbidity

Jebun

Mamun

Alam

et al. 2018

IIUMEJ

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The production and stability of two novel myco-flocculants produced by river water fungus (RWF) were investigated. Screening tests were conducted to find suitable nutrients, pH, nutrient concentration, inoculum dose, and stability for two myco-flocculants L. squarrosulus (RWF5) and S. obclavatum (RWF6). The strains showed good flocculating activity in reducing turbidity of kaolin suspension while malt extract was used as nutrient source. Supernatants of RWF5 and RWF6 were able to reduce turbidity from 900Â±10 NTU to 46 NTU (95%) and 195 NTU (78%), respectively. In order to enhance the production, optimization of cultivation conditions were studied using a one-factor-at-a-time (OFAT) method. L. squarrosulus (RWF5) reduced 96% of turbidity at optimum conditions, comprising of 0.1% (w/v) malt extract, 3% (v/v) inoculum dose, and initial pH 7.0 for 6 days. The results of the compatible mixed culture showed good flocculation activity at 88% compared to a single culture of S. obclavatum at 78%. On the other hand, L. squarrosulus showed better turbidity reduction in the single culture rather than the mixed culture. The stability of L. squarrosulus and S. obclavatum supernatants showed excellent turbidity reduction over a wide pH range of 4-8 with the maximal flocculation rate of 96% and 90%, respectively, at pH 7.0. They also exhibited high turbidity removal ability in a temperature range of 4 oC â€“ 55 oC for 24h with a maximum turbidity removal rate of 96% (RW5) and 87% (RW6) at 25 oC. Time stability of the L. squarrosulus supernatant showed good turbidity removal potential at above 90% at room temperature (28Â± 2 oC) and 85% at low temperature (4 oC) for 12 days. The high flocculating rate of the myco-flocculants and their good stability under wide range of temperature indicated their potentiality as biodegradable flocculants for water and wastewater treatment industry. ABSTRAK: Keberhasilan dan kestabilan dua myco-gumpalan baharu oleh kulat air sungai (RWF) telah dikaji. Ujian penapisan telah dijalankan untuk mencari nutrien sesuai, pH, kepekatan nutrien, dos inokulum dan kestabilan dua myco-gumpalan L. squarrosulus (RWF5) dan S. obclavatum (RWF6). Rantaian menunjukkan aktiviti gumpalan yang baik dalam mengurangkan kekeruhan air sungai dengan penggantungan koalin di mana ekstrak malt telah digunakan sebagai sumber nutrien. Larutan supernatan RWF5 dan RWF6, masing-masing mampu mengurangkan kekeruhan dari 900Â±10 NTU kepada 46 NTU (95%) dan 195 NTU (78%). Bagi meningkatkan pengeluaran, keadaan optimum bagi menggalakkan hasil telah diselidiki menggunakan kaedah Satu Faktor pada Tiap Masa (OFAT). Pada takat optimum, L. squarrosulus (RWF5) mengurangkan 96% kekeruhan, ianya terdiri daripada ekstrak malt 0.1% (w/v), dos inokulum 3% (v/v) dan pH awal 7.0 selama 6 hari. Keputusan kultur campuran yang sesuai menunjukkan aktiviti penggumpalan yang baik pada 88% berbanding kultur sendirian S. obclavatum pada 78%. Pada waktu sama, L. squarrosulus menunjukkan pengurangan kekeruhan yang lebih baik dalam kultur sendirian berbanding kultur campuran. Kestabilan larutan supernatan L. squarrosulus dan S. obclavatum menunjukkan pengurangan kekeruhan yang sangat baik pada pH yang luas iaitu 4-8 dengan kadar maksimum kekeruhan pada 96% dan 90%, pada pH 7.0 masing-masing. Keduanya menunjukkan kebolehan penyingkiran kekeruhan yang tinggi pada skala suhu 4 oC â€“ 55 oC selama 24 jam dengan kadar nyah kekeruhan maksimum pada 96% (RW5) dan 87% (RW6) pada suhu 25 oC. Kestabilan masa larutan supernatan L. Squarrosulus menunjukkan potensi penyingkiran kekeruhan terbaik atas 90% pada suhu bilik (28Â± 2 oC) dan 85% pada suhu rendah (4 oC) selama 12 hari. Kadar gumpalan yang tinggi oleh myro-gumpalan dan kestabilan yang baik pada julat suhu yang luas menunjukkan potensinya sebagai agen biodegradasi gumpalan kepada air dan industri rawatan loji air.

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Section: Compatible Mixed Culturesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Production and Stability of Myco-Flocculants From Lentinus Squarrosulus Rwf5 and Simplicillium Obclavatum Rwf6 for Reduction of Water Turbidity

Jebun

Mamun

Alam

et al. 2018

IIUMEJ

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“…Based on the morphological characteristics, the selected fungi were found to belong to the same genus: Aspergillus niger and A. flavus. Bioflocculant activity of A. niger and A. flavus has been previously reported by Aljuboori et al [23,24]. Table 1 shows the flocculating activity of the selected strains.…”

Section: Isolation Of Bioflocculant Producing Microorganismsmentioning

confidence: 56%

Characterisation of Fungal Bioflocculants and Its Application in Water Treatment

David

Oluwole

Ayodele

et al. 2019

CJAST

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Bioflocculants of microbial origin have the advantage of being safe, biodegradable and harmless to the environment. Production of bioflocculant by two fungi isolates and the factors affecting its production were investigated in this study. Primary screening of fungi for the production of bioflocculants, efficiencies and conditions for the optimum production of the bioflocculants were determined using standard microbiological and chemical methods. Aspergillus flavus MCB 271 and Aspergillus niger MCBF 08 were the best bioflocculant producers among the fourteen fungal isolates screened. Aspergillus flavus optimally produced bioflocculant with glucose and peptone as sole carbon and nitrogen sources respectively. Calcium ions (Ca2+) at 78.4% served as best cation sources for bioflocculant production with optimal pH of 7 and temperature of 40°C. Aspergillus niger MCBF 08 produced bioflocculant optimally when the media had peptone as a nitrogen source and maltose as a sole carbon source. The two species achieved the maximum flocculating activity of 97% (A. flavus MCBF 271) and 86% (A. niger MCBF 08) at pH values of 7 on the 3rd day of the study and caused a reduction in bacterial load of the wastewater samples by 58.73% and 60.85% respectively. These bioflocculants are thus potential replacement for synthetic flocculants conventionally used for wastewater treatment.

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“…This maybe due to the fact that high concentrations of Na + did interfere with the establishment of the flocs of bioflocculant TPT -1 and Kaolin particles. Moreover, high concentrations of Na + may also have denatured some functional moieties of TPT -1 that might be responsible for flocculation process (Aljuboori et al, 2015). However, TPT -1 maintained high flocculation activity (79.4%), even at high Na + concentration (35 g/L).…”

Section: Discussionmentioning

confidence: 99%

“…The zeta potential of the bioflocculant TPT -1 , Kaolin solution, Kaolin solution with BaCl2, Kaolin solution with both BaCl2 and bioflocculant TPT -1 were measured by a ZetaSizer Nano (Malvern, UK) to determine and propose the flocculation mechanism involved during flocculating of Kaolin particles in suspension by of bioflocculant TPT -1 (Aljuboori et al, 2015). The pH of the suspensions were adjusted to pH 3 using HCl or KOH.…”

Section: Zeta Potentialmentioning

confidence: 99%

Production and characteristics of bioflocculant TPT-1 from a consortium of Bacillus pumilus JX860616 and Alcaligenes faecalis HCB2

Maliehe¹,

Selepe²,

Ntombela³

et al. 2016

Afr. J. Microbiol. Res.

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Flocculation behavior and mechanism of bioflocculant produced by Aspergillus flavus

Cited by 78 publications

References 29 publications

Production and Stability of Myco-Flocculants From Lentinus Squarrosulus Rwf5 and Simplicillium Obclavatum Rwf6 for Reduction of Water Turbidity

Production and Stability of Myco-Flocculants From Lentinus Squarrosulus Rwf5 and Simplicillium Obclavatum Rwf6 for Reduction of Water Turbidity

Characterisation of Fungal Bioflocculants and Its Application in Water Treatment

Production and characteristics of bioflocculant TPT-1 from a consortium of Bacillus pumilus JX860616 and Alcaligenes faecalis HCB2

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