Detail publikace

Less is more: Optimising the biocementation of coastal sands by reducing influent urea through response surface method

Ashraf, M.S., Hassan Shah, M.U., Bokhari, A., Hasan, M.

Originální název

Less is more: Optimising the biocementation of coastal sands by reducing influent urea through response surface method

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The excessive effluent ammonia produced during the conventional biocementation of coastal sands by ureolytic Microbially Induced Calcite Precipitation (MICP) poses a looming threat to the marine environment. This research mitigates this threat by employing a brute force deployment of the Response Surface Method (RSM) for optimal minimisation of urea, which is the primary contributor of this effluent ammonia, to develop a sustainable MICP treatment model for the biocementation of coastal sand columns. The unconfined compressive strength (UCS) and calcium carbonate content (CCC) results of these columns, measured during their UCS and gravimetric acid washing testing, were used in this developed model for its validation and further optimisation. The biocementation solution resulting from this finally optimised MICP model used 75% lesser influent urea per gram of sand than its predecessor treatment model and still significantly improved the UCS of biocemented sand columns (from 0 kPa to 111.63 kPa). The structural analyses (XRD, FESEM) of these biocemented columns showed the adsorption of calcium carbonate and nesquehonite crystals on sand grains. This reduction in the consumption of urea significantly lowers the production of effluent ammonia during the biocementation of coastal sands. Therefore, it is suggested that this optimised MICP treatment model offers a sustainable method for strengthening coastal sands with little to no effect on the natural mosaic of their subsurface ecosystems.

Klíčová slova

Biocementation; Calcium carbonate content; Sustainability; Unconfined compressive strength

Autoři

Ashraf, M.S., Hassan Shah, M.U., Bokhari, A., Hasan, M.

Vydáno

15. 9. 2021

Nakladatel

Elsevier Ltd.

Místo

ELSEVIER SCI LTDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

ISSN

0959-6526

Periodikum

Journal of Cleaner Production

Číslo

315

Stát

Spojené království Velké Británie a Severního Irska

Strany od

128208

Strany do

128208

Strany počet

18

URL

https://www.sciencedirect.com/science/article/abs/pii/S0959652621024264?via%3Dihub

BibTex

@article{BUT172194,
  author="Syed Awais Ali Shah {Bokhari}",
  title="Less is more: Optimising the biocementation of coastal sands by reducing influent urea through response surface method",
  journal="Journal of Cleaner Production",
  year="2021",
  number="315",
  pages="128208--128208",
  doi="10.1016/j.jclepro.2021.128208",
  issn="0959-6526",
  url="https://www.sciencedirect.com/science/article/abs/pii/S0959652621024264?via%3Dihub"
}