Removal of ammonium by-products from the effluent of bio-cementation system through struvite precipitation

Gowthaman, Sivakumar; Mohsenzadeh, A.; Nakashima, Kazunori; Kawasaki, Satoru

doi:10.1016/j.matpr.2021.09.013

Cited by 28 publications

(18 citation statements)

References 32 publications

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“…High ammonia released from MICP may pose a threat to human health and other organisms in the environment (Lee et al 2019). Other successful efforts to remove ammonia produced from MICP was done through struvite precipitation (Gowthaman et al 2021b).…”

Section: Effect Of Cementation Dosagementioning

confidence: 99%

“…Another study treatment of peaty soil (loss of ignition of 65.815%) with fibre incorporated with bio-cementation using isolated native bacteria showed higher fibre content gained higher strength (Chen et al 2021). Gowthaman et al (2021a) has proposed the use of scallop powder addition with Sporosarcina sp. (SIID 33,506) to improve the unconfined compressive strength of clayey amorphous peat with organic content of 39% from Tomikawa, Hokkaido, Japan.…”

Section: Introductionmentioning

confidence: 99%

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Effect of microbial-induced calcite precipitation towards strength and permeability of peat

Phang

Wong

Chan

et al. 2022

Bull Eng Geol Environ

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Peat is known as problematic ground with low bearing capacity and extensively high compressibility. Bio-cementation or commonly known as microbial-induced calcite precipitation (MICP) has been recently introduced as a ground improvement alternative for peat under waterlogged condition. Using isolated bacteria strains P19 and P21 from tropical peat, it is found that unconfined compression strength (UCS) increases with bacteria concentration at a reducing rate. A maximum unconfined compressive strength of 82.05 kPa was measured with bacteria strain P21 at 108 CFU/mL. For the range of cementation reagent varying from 0.1 to 4.0 mol/kg, the largest strength improvement occurred at 1 mol/kg and 2 mol/kg using indigenous bacteria and bacteria strain P21, respectively, for peat with sand content of 25%. At 4.0 mol/kg, the cementation reagent has detrimental effect to MICP resulting in significant reduction in strength. Due to MICP, the UCS of peat increases with sand content. Calcium carbonate precipitation results in a reduction of permeability and an increment of strength of peat–sand mixture under a submerged condition up to 28 days.

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Section: Effect Of Cementation Dosagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of microbial-induced calcite precipitation towards strength and permeability of peat

Phang

Wong

Chan

et al. 2022

Bull Eng Geol Environ

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“…The experiment results showed that negatively charged zeolite could absorb NH 4 + to standard levels (i.e., less than 0.5 mg/L). Gowthaman et al [58] used struvite to significantly reduce ammonium produced as a by-product during MICP by a two-step method. In the first stage, the conditions of rinsing were studied to optimize ammonia removal from soil.…”

Section: Microbial Sand Consolidationmentioning

confidence: 99%

“…A high concentration of NH 4 + will harm the environment. At present, the research on ammonia removal mainly includes using natural zeolite to remove ammonium ions, the use of struvite to reduce ammonium by two steps, and reducing the pH in the reaction process to reduce ammonium ions [57][58][59]. More research on ammonium ion removal methods is needed in the future.…”

Section: Conclusion and Suggestions For Future Researchmentioning

confidence: 99%

Critical Review of Solidification of Sandy Soil by Microbially Induced Carbonate Precipitation (MICP)

et al. 2021

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Microbially induced carbonate precipitation (MICP) is a promising technology for solidifying sandy soil, ground improvement, repairing concrete cracks, and remediation of polluted land. By solidifying sand into soil capable of growing shrubs, MICP can facilitate peak and neutralization of CO2 emissions because each square meter of shrub can absorb 253.1 grams of CO2 per year. In this paper, based on the critical review of the microbial sources of solidified sandy soil, models used to predict the process of sand solidification and factors controlling the MICP process, current problems in microbial sand solidification are analyzed and future research directions, ideas and suggestions for the further study and application of MICP are provided. The following topics are considered worthy of study: (1) MICP methods for evenly distributing CaCO3 deposit; (2) minimizing NH4+ production during MICP; (3) mixed fermentation and interaction of internal and exogenous urea-producing bacteria; (4) MICP technology for field application under harsh conditions; (5) a hybrid solidification method by combining MICP with traditional sand barrier and chemical sand consolidation; and (6) numerical model to simulate the erosion resistance of sand treated by MICP.

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“…However, the main problem induced by MICP is the release of ammonia during the cementation process, imposing a negative impact on the ecological environment once excessive ammonia has been produced [20], approximately according to the following Equation (1). Studies have shown that the use of low-pH MICP [21,22], struvite precipitation [23], and calcium phosphate biocement [22,24] is more effective in reducing the amount of ammonia produced. More research on ammonium ion-removal methods is needed in the future to promote the application of MICP [25].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Disintegration Resistance of Microbially Solidified Granite Residual Soil

et al. 2022

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Microbially induced calcium carbonate (CaCO3) precipitation (MICP) is an emerging soil-treatment method. To explore the effect of this technology on granite residual soil, this study investigated the effects of the mechanical properties and disintegration resistance of microbially cured granite residual soil under different moisture contents by conducting direct shear and disintegration tests. The curing mechanism was also discussed and analyzed. Results showed that MICP can be used as reinforcement for granite residual soil. Compared with those of untreated granite residual soil, the internal friction angle of MICP-treated granite residual soil increased by 10% under a moisture content of 30%, while its cohesion increased by 218%. The disintegration rate of the MICP-treated granite residual soil stabilized after a maintenance time of 5 days under different water contents. Therefore, we provide the explanation that the improvement of the shear strength and disintegration resistance of granite residual soil is due to CaCO3 precipitation and the surface coating.

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Removal of ammonium by-products from the effluent of bio-cementation system through struvite precipitation

Cited by 28 publications

References 32 publications

Effect of microbial-induced calcite precipitation towards strength and permeability of peat

Effect of microbial-induced calcite precipitation towards strength and permeability of peat

Critical Review of Solidification of Sandy Soil by Microbially Induced Carbonate Precipitation (MICP)

Experimental Study on the Mechanical Properties and Disintegration Resistance of Microbially Solidified Granite Residual Soil

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