Enviro Wiki’s Post

In case you are interested how Fe scraps can help with treatment of groundwater contaminated with Zn and Ni, check out this fresh publication: https://lnkd.in/gBn9GhcU It summarizes the experience gained from the MetalRem project and includes my humble contribution to the laboratory-scale experiments.

When predicting metal leaching and acid rock drainage from landforms, as an industry we continue to struggle in communicating with confidence kinetic testing results, and the required scaling using empirical and/or numerical methods. Check out Okane’s latest Converations on Closure, where we describe Okane’s Advanced Customizable Leach Colimns (ACLCs) that can be purpose fit to your needs and eliminate the need for geochemical scaling factors. #AMD #ML-ARD #mineclosure #sustainability

How can we better predict acid and metalliferous drainage (AMD) to inform mitigation and management strategies? This month’s Conversation on Closure dives into the role of kinetic geochemical tests—like column leach and humidity cell testing—and what design features to consider when enhancing test methods to replicate real-world and specific site conditions as closely as possible. To learn more, read the article here: https://lnkd.in/e-9iQcPF. #AMD #KineticTesting #EnvironmentalGeochemistry #Okane

Application report describes the principle of the #ICPOES analysis of #lithium hydroxide, as well as line selection and detection limits with the SPECTRO ARCOS MultiView. Learn more now: https://lnkd.in/eNjp_YfZ

📚Revolutionizing Carbonate Reservoir Stimulation: Insights from Alternating Acid Fracturing 📍This study explores alternating acid fracturing in carbonate formations using true tri-axial experiments. Results reveal that combining acid and pad fluids reduces fracturing pressure, enhancing natural fracture connectivity. Innovative curvature analysis via 3D scanning unveils intricate fracture morphologies, offering a pathway to optimize acid fracturing designs and stimulate unconventional reservoirs effectively. 📍Alternating acid fracturing with fluids like gelled acid and cross-linked gel demonstrates superior performance over single-acid treatments. Observations highlight complex fracture propagation and hydraulic-natural fracture interactions. The findings are a breakthrough in understanding fracture dynamics, providing critical guidelines for acid fracturing in heterogeneous, low-porosity carbonate reservoirs. Check out this article: https://lnkd.in/dg6UMVBM #carbonate, #acid #fracturing, #hydraulic fractures, unconventional #reservoirs, #stimulation design

Thermal analyses, like the Rock-Eval (RE) analysis, are promising to quantify SOC and SIC in a single analysis, but, to our knowledge, no development was conducted to assess δ13CSOC and δ13CSIC. We coupled a RE device to an isotopic gas analyser (Picarro) to continuously measure δ13CCO2 and approach δ13CSOC and δ13CSIC. We hypothesised that different carbonate mineralogies and/or crystal sizes in SIC involve fluctuations of the δ13CCO2.

🔬 𝐄𝐗𝐏𝐄𝐂 𝟕𝟗𝟔 𝐇𝐢𝐠𝐡-𝐓𝐡𝐫𝐨𝐮𝐠𝐡𝐩𝐮𝐭 𝐒𝐮𝐩𝐞𝐫 𝐌𝐢𝐜𝐫𝐨𝐰𝐚𝐯𝐞 𝐃𝐢𝐠𝐞𝐬𝐭𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦 Handling rock samples is challenging due to their complexity and insolubility, making precise pre-treatment crucial for accurate testing. The EXPEC 796 High-Throughput Super Microwave Digestion System features a sealed reaction chamber preloaded with 40-100 Bar of inert gas. It utilizes an efficient microwave direct coupling waveguide design, achieving temperatures of up to 300℃ and ultra-high pressures of 200 Bar. With a maximum throughput of 80 positions, it ensures the efficient and thorough digestion of samples. At EXPEC, we used the EXPEC 796 to digest rock quality control samples, followed by elemental analysis using ICP-OES and ICP-MS. We evaluated the sample parallelism after digesting three types of rock samples: quartz sandstone, shale, and granite gneiss, using this system. The results show that the super microwave digestion method completely digests various rock types, with shorter pre-treatment times and higher digestion throughput. EXPEC Technology has achieved significant breakthroughs and industrialization in the field of scientific instruments and high-end mass spectrometry. Customization services are available, with a minimum order requirement of 20 units. #MicrowaveDigestion #Geochemistry #GCMS #GC #LCMS #analyticalinstruments #innovation #automation #science #technology #analyze #analysis #analyzer #labinstruments #testequipment #biotechnologies #spectrometer #spectroscopy #environment #testing #laboratory #instruments #metalanalysis #materialanalysis #semiconductorindustry #environmentalanalysis #materialInspection #sanitation #metalanalyzer

How to detect the type of #fouling or #scaling on the #reverse_osmosis membrane from the analysis of the total amount of water produced and the quality of the #permeate flow? . . . Fouling/scaling in #reverse_osmosis membranes manifests itself as an increase in the pressure difference at the inlet and outlet of a #pressure_vessel. An increase in pressure drop indicates the accumulation of pollutants on the surface of the #membrane and a decrease in the flow passage area, resulting in a dramatic #pressure_drop. Therefore, the flow pressure drop at the inlet and outlet of the #pressure_vessel and the permeate flow should be checked regularly to detect the clogging. In the time of detecting #fouling or #scaling, #permeate stream quality data should be reviewed. When #scaling is formed on the surface of the #membrane, according to the nature of the materials accumulated on the surface of the #membrane, at the same time as the production flow rate decreases in the process, the #TDS of the production flow should also increase. This is despite the fact that when biological clogging occurs on the surface of the #membrane, not only the unusual increase in #TDS of the production stream is not seen, but a slight decrease in this parameter may also be reported. This phenomenon can be understood by examining the separation mechanism in #reverse_osmosis #membranes. In #reverse_osmosis membranes, unlike #microfiltration, #ultrafiltration, and even #nanofiltration membranes, the separation mechanism is not based on the #sieve_mechanism and the #solution_diffusion process is formed to form the infiltrated flow. Therefore, the concentration of each substance in the infiltrated flow (assuming constant #transmembrane_pressure) depends on the concentration of that substance on both sides of the #membrane and the #solubility_coefficient of that substance in the #membrane environment. It is obvious that the formation of scaling on the surface of the #membrane increases the concentration difference significantly and we can expect an increase in #TDS in the produced water. However, #biological_fouling on the membrane surface cannot play this role. It is clear that by correctly diagnosing the type of scaling/fouling, you can choose a suitable #treatment_method to #regenerate the membrane. Of course, in some cases due to #bad_operation and/or #wrong_design, both phenomena may occur at the same time, in which cases it is recommended to split one of the #membranes for further investigation and by conducting laboratory tests on the #membrane, the exact type and determine the composition of the #blockage. #RO #Desalination #Water #Drinking_water #Fresh_water #Fouling #Scaling #Permeate #CIP #Retentate 

Just released: Binding mechanisms of trivalent chromium on colloidal phases from ultramafic systems: Insights from batch experiments and XAS analysis Highlights • Cr(III) sorption to ten mineral phases and humic acid was investigated. • Binding mechanisms depend on the surface properties of each phase. • Only pyrolusite partially oxidized Cr(III) to Cr(VI); Cr(III) persisted with other phases. • Cr K-edge XAS spectroscopy indicates Cr(III) surface complexation process. • Sorption isotherms could be predicted with Langmuir or linear isotherm equations. https://lnkd.in/efFRpewA

Identification of Geochemical Anomalies Based on RPCA and Multifractal Theory.