The evaluation of Bacillus-secreted polyglutamic acid as anti-scaling treatment for circulating cooling water

Li, Yutong; Yan, Zhen; Li, Jun; Song, Chao; Zhu, Fanping; Wang, Shuguang

doi:10.1007/s11356-022-21299-3

Cited by 3 publications

(2 citation statements)

References 47 publications

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“…The FTIR spectra of freeze-dried GPA-BG biopolymer revealed the presence of BG by the peaks corresponding to the wavenumbers 994 cm −1 and 1076 cm −1 . The peaks of GPA were at 1214 cm −1 and 1415 cm −1 [ 45 , 46 ]. As indicated in Figure 8 , there existed a sharp increase in intensity at 1030 cm −1 for both CL and ML.…”

Section: Resultsmentioning

confidence: 99%

Freeze-Dried β-Glucan and Poly-γ-glutamic Acid: An Efficient Stabilizer to Strengthen Subgrades of Low Compressible Fine-Grained Soils with Varying Curing Periods

Vishweshwaran,

Sujatha,

Baldovino

2024

Polymers

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The freeze-drying of biopolymers presents a fresh option with greater potential for application in soil subgrade stabilization. A freeze-dried combination of β-glucan (BG) and γ-poly-glutamic acid (GPA) biopolymers was used to treat low compressible clay (CL) and low compressible silt (ML) soils in dosages of 0.5%, 1%, 1.5%, and 2%. The California bearing ratio (CBR) test for the treated specimens was performed under three curing conditions: (i) thermal curing at 60 °C, (ii) air-curing for seven days followed by submergence for 4 days, and (iii) no curing, i.e., tested immediately after mixing. To investigate the influence of shear strength on the freeze-dried biopolymer-stabilized soil specimens and their variations with aging, unconfined compressive strength (UCS) tests were conducted after thermal curing at 60 °C for 3 days, 7 days, and 7 days of thermal curing followed by 21 days of air curing. The maximum CBR of 125.3% was observed for thermally cured CL and a minimum CBR of 6.1% was observed under soaked curing conditions for ML soils. Scanning electron microscopy (SEM), infrared spectroscopy, average particle size, permeability, and adsorption tests revealed the pore filling, biopolymer adsorption and coating on the soil surface, and agglomeration of the soil along with the presence of hydrogen bonds, covalent amide bonds, and Van der Waals forces that contributed to the stiffening of the stabilized soil. Using three-dimensional (3D) finite element analysis (FEA) and layered elastic analysis (LEA), a mechanistic–empirical pavement design was carried out for the stabilized soil and a design thickness catalog was prepared for the maximum CBR. The cost reductions for a 1 km section of the pavement were expected to be 12.5%.

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Section: Resultsmentioning

confidence: 99%

Freeze-Dried β-Glucan and Poly-γ-glutamic Acid: An Efficient Stabilizer to Strengthen Subgrades of Low Compressible Fine-Grained Soils with Varying Curing Periods

Vishweshwaran,

Sujatha,

Baldovino

2024

Polymers

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“…Further studies have discovered that soluble extracellular polymeric substances (s-EPS) secreted by Bacillus cereus can form a biomineralized film, inhibiting corrosion and calcium scale crystal formation [18]. Concurrently, Bacillus subtilis has been found to form a dense biofilm on the surface of cold-rolled steel, decelerating corrosion [19]. Liu proposed the reduction of COD and nutrient limitation as strategies for controlling biological pollution without the need for increased bactericide usage [20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Microbial Community in Circulating Cooling Water System of Coal Power Plant during Reagent Conversion

Wang,

Ye,

et al. 2023

Sustainability

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The use of phosphorus-containing chemical corrosion and scale inhibitors has been found to result in excessive phosphorus discharge and an inability to reduce the high concentration of CODcr in the circulating cooling water, thereby making it challenging to comply with increasingly stringent sewage discharge standards. This study aims to assess the practicality of utilizing biological corrosion and scale inhibitors in coal power plants’ operation, as well as investigating the correlation between water quality indicators and microbial communities during the conversion period. The data illustrates that, in comparison to the chemical method, there is a decrease in turbidity of the circulating water from 19.44 NTU to 9.60 NTU, a reduction in CODcr from 71.55 mg/L to 45.47 mg/L, and a drop in TP from 2.35 mg/L to 0.38 mg/L. Microbial community analysis during the transition period reveals that microorganisms rapidly establish a new equilibrium in the circulating water, sediment, and fiber ball, resulting in significantly different microbial community structures. The relative abundance of corrosive microorganisms such as Flavobacterium, Pedomicrobium, and Hydrogenophaga is significantly diminished in the circulating water, whilst the abundance of anaerobic microorganisms like Anaerolineaceae and Rhodopseudomonas in the sediment also declines. Conversely, there is an increased presence of microorganisms associated with contaminant degradation, such as CL500-3 and SM1A02. These findings suggest a decrease in the risk of system corrosion and an enhancement in contaminant degradation capability. This study provides evidence supporting the replacement of chemical agents with biological agents in circulating cooling water systems, contributing to more environmentally friendly and sustainable practices.

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Does the concentration ratio contribute to the scaling of circulating cooling seawater?

Qi,

Wei,

Wang

et al. 2024

Desalination

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The evaluation of Bacillus-secreted polyglutamic acid as anti-scaling treatment for circulating cooling water

Cited by 3 publications

References 47 publications

Freeze-Dried β-Glucan and Poly-γ-glutamic Acid: An Efficient Stabilizer to Strengthen Subgrades of Low Compressible Fine-Grained Soils with Varying Curing Periods

Freeze-Dried β-Glucan and Poly-γ-glutamic Acid: An Efficient Stabilizer to Strengthen Subgrades of Low Compressible Fine-Grained Soils with Varying Curing Periods

Analysis of Microbial Community in Circulating Cooling Water System of Coal Power Plant during Reagent Conversion

Does the concentration ratio contribute to the scaling of circulating cooling seawater?

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