Given that acid-rich rainfall can cause serious damage to heritage buildings in NW China and subsequently accelerate their aging problem, countermeasures protect integrity also preserve the continuity of Chinese culture are pressing need. Enzyme-induced carbonate precipitation (EICP) modifies mechanical properties soil through enhancing interparticle bonds by precipitated crystals formation other minerals is under a spotlight recent years. EICP considered as an alternative microbial-induced...

Heavy metal contamination during the rapid urbanization process in recent decades has notably impacted our fragile environments and threatens human health. However, traditional remediation approaches are considered time-consuming costly, effect sometimes does not meet requirements expected. The present study conducted test tube experiments to reproduce enzyme-induced carbonate precipitation applied lead under effects of urease concentration a calcium source. Furthermore, speciation sequence...

Considering extensive metallurgical mining activities in the northwest of China, handling Cu- and Pb-rich wastewater is a challenging task. Inappropriate can lead to accumulation Cu Pb surrounding environment, thereby posing serious threat human health. Electrokinetic (EK) technology an increasingly popular alternative traditional approaches for contaminated soil remediation owing its high effectiveness low risk secondary pollution. This study first proposed external regulatory system with...

Lead (Pb) can accumulate in organisms causing damage to liver and kidney functions. Preventing Pb2+ migration surrounding environments is considered of great necessity. This study explored the potential applying loess nanoscale zerovalent iron-amended (nZVI-AL) Pb immobilization. The static equilibrium adsorption analyses showed that by nZVI-AL was classed as homogeneous monolayer surface adsorption. nZVI particles provided with more sites for their attachment prevented using Fe-O Fe-O-H...

Inappropriate irrigation could trigger migration of heavy metals into surrounding environments, causing their accumulation and a serious threat to human central nervous system. Traditional site remediation technologies are criticized because they time-consuming featured with high risk secondary pollution. In the past few years, microbial-induced carbonate precipitation (MICP) is considered as an alternative traditional due its easy maneuverability. The enzyme-induced precipitate (EICP) has...

Loess features metastable microstructure and is deemed susceptible to chemical contaminant permeation. However, studies on the loess permeability evolution under water environments are remarkably limited. In this study, response of sodium sulfate seepages was analyzed using temporal relationship cations concentration, X-ray diffraction fluorescence (XRD XRF), mercury intrusion porosimetry (MIP), scanning electron microscope (SEM) tests. The characteristics were identified, its underlying...

Heavy metals in landfill leachate are easily adsorbed by soil particles, causing serious threats to human health and surrounding environments. Mining metallurgy activities intensive Northwest China, thereby enlarging threats. The aim of the present study is enhance our knowledge about linkage between microstructural evolution loess induced lead contamination macro air liquid permeability properties. A series tests on uncontaminated Pb-contaminated specimens were conducted. Their properties...

Abstract For evaluating the structure and strength of loess effectively, a series laboratory tests were performed to investigate compare pore meso-structural characteristics, shear resistivity natural treated with alkali solutions under 4 different concentrations. Scanning electron microscope(SEM) method, direct tests, electrical X-ray diffraction analysis used detect changing process in parameters, micro-structure, mineral composition. The evolution result index stress-strain...

This study focuses on determining the electrical resistivity under acid- and alkali-contaminated loess establishing a correlation between with water content, composition, concentration of contamination. Then, alkali-polluted intact were taken as research objects for experiment by using self-developed voltammetry test device. Test results show that influencing characteristics voltage, pollution remolded analyzed. The reveal major influence acid alkali contamination compacted loess. decreases...