Unsaturated soil is a form of natural whose pores are filled by air and water. Different from saturated soil, the microstructure unsaturated consists three phases, namely, solid phase (soil particle), vapor phase, liquid phase. Due to matric suction pores, hydraulic mechanical behaviors soils present significant dependence on moisture condition, which usually results in series unpredictable ris...

Heavy metal pollution in soil and water has been of worldwide concern due to their biotoxicity/ecotoxicity the ecosystem, accumulation food chain, persistence environment. Microbially induced carbonate precipitation (MICP) is known as an efficient cost-effective biogeochemical process for remediation heavy metals contaminated This study reviews mechanisms biomineralization urease-producing micr...

Abstract In the present study, optimization of microbiologically induced calcium carbonate precipitation (MICP) to produce biosandstone regarding compressive strength is shown. For production, quartz sand was treated sequentially with ureolytic microorganism Sporosarcina pasteurii (ATCC 11859) and a reagent containing urea chloride. Response surface methodology (RSM) applied investigate influen...

Microbially induced carbonate precipitation (MICP) technology is an environmentally friendly technique that can contribute to tailings consolidation and ecosystem restoration. Our study found local MICP bacteria, Lysinibacillus fusiformis, could remediate copper pollution at different slope positions (K1, K2, K3) in arid areas. We analyzed the effect of treatment on slag from macro- microscopic...

Conventional geotechnical practice considers that soil is an inert construction material and its engineering properties do not change with time. However, a living ecosystem, naturally as stable ecological system gradually established following initial construction. Over the last few decades, researchers started exploring way to engineer some microorganisms’ activities in order solve problems en...

Abstract Protocols for microbially induced carbonate precipitation (MICP) have been extensively studied in the literature to optimise process with regard amount of injected chemicals, ratio urea calcium chloride, method injection and intervals, population bacteria, usually using fine- medium-grained poorly graded sands. This study assesses effect varying urease activities, which not systematica...

The development of alternatives to soil stabilization through mechanical and chemical has paved the way for biostabilization methods. Since its development, researchers have used different bacteria species treatment. Soil treatment bioremediation techniques been understand effect on strength parameters contaminant remediation. Using a living organism binding grains make mass dense durable is ba...

This research focused on the evaluation of potential use a soil-isolated bacteria, identified as Staphylococcus equorum, for microbial-induced calcite precipitation (MICP) and copper removal. Isolated bacteria were characterized considering growth rate, urease activity, calcium carbonate precipitation, tolerance minimum inhibitory concentration (MIC) precipitation. Results compared with Sporosa...

To improve the mechanical properties of calcareous sand, it is proposed that microbial induced calcium carbonate precipitation (MICP) technology be used. A series solidification tests were conducted in natural seawater and freshwater environments. The standard stress path static triaxial apparatus was used to conduct shear on sand solids under varying reinforcement conditions. composite power-e...