Results showed that the sonochemical modification process could reduce particle size, enhance effective cation exchange capacity from 0.10 to 1.58 meq/g, and enlarge the surface area of CL from 31.14 to 37.25 m 2 /g The cadmium removal efficiency of the modified CL was optimized using response surface methodology (RSM) with …

The studied soil was collected from the surface layer (0–20 cm) of a village close to a mining area southwest of Jiangxi, China. The collected soil was air-dried and ground before sieving to remove >2 mm gravels and <0.075 mm fine particles (particle-size cut points based on the previous studies), and then homogenized and stored until …

The actual design run by the statistics software, Design-Expert 8.0.6, is presented in Table S1. The experimental sequence and the summarized results are presented in Table 1.The significant factors in the flocculating process were determined to be X 2 (P = 0.0025), X 3 (P = 0.0065), and X 1 (P = 0.0173), respectively (Table S2). …

1. Introduction. Soil and crop pollution as a result of mining activities is now an important issue around the world (Candeias et al., 2014).Pollution is predominantly from mining activities in paddy fields of China, whilst the soils in the south are more polluted than north China (Zhao et al., 2015).High concentrations of heavy metals (As, Cu, Zn, Cd, Pb …

The areas of the active and abandoned mine fields were 2103.63 m 2 and 10,425 m 2, respectively.The extent of current environmental degradation in the area caused by gold mining activities, the demographic and socio-economic characteristics of the people are recently published in Mensah and Tuokuu (2023).We produced thematic …

Designing an efficient and recyclable adsorbent for cadmium pollution control is an urgent necessity. In this paper, cow manure, an abundant agricultural/animal husbandry byproduct, was employed as the raw material for the synthesis of magnetic cow manure biochar. The optimal preparation conditions were found using the response …

In this study, the process of cadmium biosorption on NaOH pretreated Aspergillus niger biomass was investigated in the batch mode. The effect of three independent variables, initial pH of solution (1.3–8.7), biomass dosage (0.1–7.5 g/l) and initial cadmium ion concentration (0.5–37.5 mg/l) on the biosorption process was …

The process typically involves open-pit or underground mining of the ore, followed by flotation, roasting, and refining to separate cadmium from zinc and other elements. Geologically, cadmium is found in sedimentary rocks and is commonly associated with sulfide mineral deposits. These deposits are typically formed through hydrothermal …

The cadmium-resistant bacteria can be grouped into three levels. The main group consists of bacteria which efflux the cadmium from the cells. The bacteria of the other two groups are capable of detoxifying or binding cadmium. ... The coal mine isolated bacteria Anabaena doliolum Ind1 could also remove the about 92% of cadmium …

Modified date: 29/07/2023. Cadmium is a chemical element with the symbol "Cd" and atomic number 48. It is a soft, bluish-white metal that belongs to the transition metals group in the periodic table. Discovered in 1817 by German chemist Friedrich Stromeyer, cadmium has since found various industrial applications despite its known toxicity.

Statistical optimization for cadmium removal using Ulva fasciata biomass: Characterization, immobilization and application for almost-complete cadmium removal …

1. Introduction. Cadmium accumulation and persistence in nature leads to heavy metal pollution. On one hand, biodegradation of Cd 2+ is difficult, as only the chemical valence and compound species is changed under the action of microorganisms [1], which may even transform it into a more toxic compound [2].On the other hand, Cd …

The word, "optimization," is somewhat ambiguous; the Oxford English Dictionary defines it as: the action of making the best or most effective use of a situation or resource. For us, that has historically meant dynamic, automated truck assignments based on real-time situational information. Leveraging our industry-first and still best-of ...

This research study reported the feasibility of cadmium removal using green algae, Caulerpa scalpelliformis, under controlled environmental conditions. The algal …

1. Introduction. The extraction of mineral resources in an open pit mine provides valuable (ore) and waste materials for the subsequent stages of the supply chain [Citation 1–3].Figure 1 presents the framework of a typical open pit mining operation. A mixed integer programming (MIP) based mathematical model defines the movement of …

Cadmium is considered as a highly toxic metal. It is widely used in metallurgy, 1 pigment, 2 electronics, 3 and ceramics industries. 4 This metal is also used in solar batteries, electroplating, metallurgical industries, and synthetic chemicals industries. 5,6,7 The recovery of cadmium metals is normally extracted from both primary and …

Cadmium separation from zinc plant residues (ZPR), which contained 16.56% CdO, was optimized using a statistically designed experiment. Variables such as the solid/liquid …

Through three experiments, the average value of the cadmium leaching rate is 98.18%, and the deviation from the predicted value is 1.02, Higher is the …

1. Introduction. As one of the most mobile and potentially toxic elements in the soil, cadmium (Cd) has received broad attention as a source of pollution in paddy fields [1].Cd 2+ exhibits higher solubility and mobility than other heavy metal ions, resulting in its rapid absorption by crops (Zou et al., 2021). Furthermore, Cd 2+ translocates and …

Water pollution caused by toxic heavy metal discharge from process industries and mining sites is a major concern [3]. Despite being an essential micronutrient, excessive heavy metal intake can have a variety of toxic effects [4]. Cadmium is one of the toxic heavy metals and longstanding environmental contaminants [5].

Results showed that the sonochemical modification process could reduce particle size, enhance effective cation exchange capacity from 0.10 to 1.58 meq/g, and …

In this regard, soil samples from 33 locations at 12 mining/smelting sites in China were collected and examined in terms of soil properties, chemical fraction distributions, and bioaccessibilities of cadmium (Cd), lead (Pb), and arsenic (As). ... Total cadmium and lead concentrations ranged from 0.3 to 1937.7 and 13.4–39666.7 mg/kg, …

Cadmium is produced as a by-product from mining, smelting, and refining sulphide ores of zinc, and to a lesser degree, lead and copper. Cadmium minerals do not occur in …

High performance self-assembled sulfidized nanoscale zero-valent iron for the immobilization of cadmium in contaminated sediments: Optimization, microbial …

the cadmium concentration reached 0.05 mg/L with the removal efficiency of 99.5%, still meeting QCVN 40: 2011/BTNMT. After 1400 min, the outlet Cd concentration was 0.052 mg/L with a

The results indicated that 4 g of dry Ulva fasciata biomass was found to successfully remove 99.96% of cadmium from aqueous …

Phosphate mining wastelands are replete with PR, which provides a natural passivator for the bioimmobilization of Cd contamination from these areas. However, PR mainly contains insoluble phosphate, which is not ideal for the direct remediation of Cd-contaminated soil. ... Cadmium-contaminated soil was sterilized at 121 °C. The sterilized …

The highest percentage of cadmium removal was obtained in the run 5 with a value of 99.96%, where cadmium concentration is 200 mg/L, biomass is 4 g/L and pH is 5, while the minimum cadmium removal percentage was observed in the run number 19 with a value of 84.36% where cadmium concentration is 100 mg/L, pH is 5 and biomass …

maximum cadmium removal. ˚e relationship between cadmium removal percentage and the independent vari- ables is determined by multiple-regression statistical analysis and the analysis of variance ...

From the above description, two types of cadmium and arsenic contamination may be caused during the underground coal mining: 1) If the height of the mining fissure growth is larger than the mining depth (Fig. 1), mining fissures can develop to the ground.When the fissure growth results to a cut-through of surface water and goaf, …

This study is focused on the optimization of effective parameters on Cadmium and Zinc recovery by atmospheric acid leaching of low-grade waste by response surface methodology (RSM) and using...

Lead, cadmium and chromium are simultaneously present in electroplating wastewater in the concentration of 18 mg/l, 17 mg/l and 451 mg/l, respectively [9]. In the experiment, 1.4 l of solution is made of fix concentration of 18 mg/l of lead, 451 mg/l of chromium, and 17 mg/l of cadmium was treated under different experimental conditions …

1. Introduction. Due to the adverse effects of heavy metals on plants, animals and humans, the remediation of soils contaminated heavy metal has received much attentions (Li et al., 2018).Cadmium (Cd 2+) is a transitional heavy metal that exists in the aquatic environment through geochemical processes and is increasingly exposed to the …

Association rule mining is an effective methodology to optimize water monitoring. •. Patterns in the data and automatic probes can estimate 56% of laboratory variables. •. The influence of environmental factors is significant in optimizing. •. Water quality and anthropogenic influence do not influence optimization. •.