What compound inside biocoagulants/bioflocculants is contributing the most to the coagulation and flocculation processes?

Kurniawan, Setyo Budi; Imron, Muhammad Fauzul; Chik, Che Engku Noramalina Che Engku; Owodunni, Amina Adedoja; Ahmad, Asmah; Alnawajha, Mohammad Mohammad; Rahim, Nurul Farhana Mohd; Said, Nor Sakinah Mohd; Abdullah, Siti Rozaimah Sheikh; Kasan, Nor Azman; Ismail, Suzylawati; Othman, Ahmad Razi; Hasan, Hassimi Abu

doi:10.1016/j.scitotenv.2021.150902

Cited by 77 publications

(23 citation statements)

References 83 publications

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“…Thus, microbial flocculants are gaining more attention because they are quickly reproducible within a short time and are weather-independent [ 17 ]. Microbial flocculants are produced by bacteria and fungi and are mainly composed of carbohydrates, proteins, and lipids [ 18 ]. Although bioflocculants are promising alternatives, the high costs of their production and the generally low yields are major bottlenecks for their industrial utilisation [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Isolation and Optimisation of Culture Conditions for a Marine Bioflocculant-Producing Bacterium and Application of Its Bioflocculant in Wastewater Treatment

Selepe

Maliehe

Moganedi

et al. 2022

IJERPH

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The application of bioflocculants has become an alternative to that of chemical flocculants in wastewater treatment due to their environmental friendliness and non-toxic effects. This study aimed at isolating a bioflocculant-producing bacterium from marine water, optimisation of its culture conditions, and investigation of the removal efficiency of its bioflocculant on pollutants in wastewater. The bacterium was identified by 16S rRNA gene analysis. Optimal carbon and nitrogen sources, inoculum size, temperature, pH, and time were determined by the one-factor-at-a-time assay. The cytotoxicity of the bioflocculant was assessed on African green monkey kidney and bovine dermis cells using a tetrazolium-based columetric (MTT) method. Its removal efficiencies on chemical oxygen demand (COD), biological oxygen demand (BOD) and sulphur were determined using the Jar test method. The bacterial isolate was identified as Ochrobactrum oryzae AB84113. A maximum flocculating activity of 92% and a yield of 3.768 g/L were obtained when a 1% (v/v) inoculum size was used in the presence of starch and yeast extract at pH 7, 30 °C, and after 72 h of cultivation. The bioflocculant demonstrated non-cytotoxic effects on bovine dermis and African green monkey kidney cells. The bioflocculant removed 98% COD, 91% BOD and 86% of Sulphur. The bioflocculant has potential for pollutant removal from industrial wastewater.

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Section: Introductionmentioning

confidence: 99%

Isolation and Optimisation of Culture Conditions for a Marine Bioflocculant-Producing Bacterium and Application of Its Bioflocculant in Wastewater Treatment

Selepe

Maliehe

Moganedi

et al. 2022

IJERPH

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“…Polyacrylamide (PAM) as coagulant aid is widely used in wastewater treatment due to its excellent flocculation ability and low monomer cost. Its mechanism involves stretching the macromolecular flocculant in the solution and capturing fine particles to generate large flocs (Kurniawan et al 2022).…”

Section: Analysis Of Purification Bathing Wastewater Mechanism In Dsl...mentioning

confidence: 99%

Purification of bathing wastewater by double suspended layer fluidized bed reactor

Ban

2022

Water Science and Technology

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An external radial magnetic field and built-in stainless steel balls formed a magnetic suspended layer (MSL), as observed in this study. Under the condition of crossflow inflow, the flocculating agent and coagulant aids form a flocculated particles suspension layer (FPSL). Thus a double suspended fluidized bed reactor was constructed to treat bathing wastewater. Using a Particle image velocimetry device to detect flow patterns, analyze the flocculation conditions. The results showed that under the condition of crossflow inflow, at the same time,the flooding water was 0.023–2.101 m3/h, and the dosage of poly aluminum chloride (PAC) and Polyacrylic Amide (PAM) was 90 mg/L and 1.5 mg/L, respectively, removed rates of Turbidity, Chemical Oxygen Demand (CODCr) and linear alkylbenzene sulphonates (LAS) reached more than 99, 90,and 80%. Filtration, grid flocculation and particle interception were functions of the MSL. Meanwhile, the crossflow input created additional vortexes, increasing the likelihood of flocculation particle collision, improving the flocculation condition, and cleaning the MSL. The reactor aids in the development of the initial flocculated particles suspension layer, flocculation strengthening, chemical dosage reducting, effluent qualities improvement, and effluent stability maintenance.

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“…This means a higher dose of MO seed powder will harvest a higher number of microalgae. Kurniawan et al (2022) reviewed that MO seeds contain chemical compounds of Amides group, Ester group, and Hydroxyl group that helps to form bridging structure that enhances the microalgal adsorption capacity. In this context, a higher dose of 70 mg MO seed per litre of microalgae solution is recommended for an effective harvesting process.…”

Section: Coagulant Dosementioning

confidence: 99%

Harvesting of Microalgal Biomass Using Moringa Oleifera as Natural Coagulant: A Cost-Effective Approach

et al. 2022

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Microalgae has been considered one of the most promising 3rd generation biofuel sources. Nevertheless, the commercialization of this biomass has not been successful in developing countries due to the energy-intensive harvesting process. The aim of the present study is to find a suitable coagulant which is locally available, costeffective, non-toxic, and environmentally friendly. In this regard, Moringa Oleifera (MO) seed powder, locally known as Shojne in Bangladesh, is used as natural coagulant to fulfil the present crisis. However, the harvesting efficiency and coagulant properties of MO were evaluated through jar-test, where wastewater grown microalgae, cultured in a photobioreactor (PBR), was used. This study optimized the harvesting parameters such as coagulant dose, mixing rate, and mixing time. As those parameters have a significant impact on the microalgae harvesting process. Low mixing rate and mixing time have better performance with coagulant dose varied from 10-70 mg/L. The highest harvesting efficiency of 83% microalgae recovery was achieved at 20 rpm for 10 minutes with coagulant dose of 70 mg/L. The MO seeds are recommended to be prospective coagulants for both water treatment and microalgae harvesting. Journal of Engineering Science 13(1), 2022, 51-59

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What compound inside biocoagulants/bioflocculants is contributing the most to the coagulation and flocculation processes?

Cited by 77 publications

References 83 publications

Isolation and Optimisation of Culture Conditions for a Marine Bioflocculant-Producing Bacterium and Application of Its Bioflocculant in Wastewater Treatment

Isolation and Optimisation of Culture Conditions for a Marine Bioflocculant-Producing Bacterium and Application of Its Bioflocculant in Wastewater Treatment

Purification of bathing wastewater by double suspended layer fluidized bed reactor

Harvesting of Microalgal Biomass Using Moringa Oleifera as Natural Coagulant: A Cost-Effective Approach

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