Coupling simulation of microbial growth and MICP phenomena based on reaction-diffusion system

Abstract

Microbially induced carbonate precipitation (MICP) has been recognized as that microbial metabolism may induce a generation of calcium carbonates in the pores and/or on the surface of sand particles. However, only actual observations approach of inner structures by microscopes are difficult to understand the MICP process. In the current work, we propose a mathematical and numerical simulation model based on the reaction-diffusion system and finite difference method, respectively in order to understand dynamically calcium carbonate precipitation process and relationship between bacterial growth and precipitation. As a result, some temporal and spatial precipitation structures of calcium carbonate such as active and inactive bonds structures were obtained through some numerical examples, which are in good agreement with the existing experimental results.

[Retracted] Numerical Simulation Method for Microbial Remediation Effect of Nano Heavy Metal Contaminated Soil

“…At present, soil remediation techniques at home and abroad mainly include (i) physical methods, including guest soil/soil exchange, electric remediation, thermal treatment, and mulching [3]; (ii) biological methods, including phytoremediation, bioremediation, and microbial remediation [4,5]. Third, chemical methods include acid/base conditioning, curing/stabilization, and chemical drenching [6]. Among them, physical remediation requires special equipment, which is relatively costly and prone to secondary pollution; biological remediation has a long cycle time; chemical remediation has the characteristics of short cycle time, wide applicability, and diversification of treatment methods, but chemical remediation requires a large amount of chemical reagents to be invested; the heavy metal content of the soil needs to be constantly and repeatedly tested during the remediation process; and the production of chemical reagents cannot achieve lowcarbon environmental protection.…”