The RDA analysis showed the some acidic microbes were highly associated with heavy metals. Previous studies have verified the heavy metal polluted soil would affect the microbial community structure, microbial biomass and microbial residues [37–39]. Some specific microorganism have the ability to adsorb heavy metal [40–41]. We found that ...
The purposes of this paper are (1) to investigate the behavior, distribution, and characteristics of heavy metals including REEs, Th, and U in sludge compared with those in natural soil and (2) to study the removal/recovery process of heavy metals from polluted sludge with biosurfactant elution by batch and column experiments.
heavy metals. Figure 2 shows a series of several revegetation test plots on the chat piles in Galena, Kansas. Another way plants can be used to clean up heavy-metal contaminated soil is called phytoextraction. Some plant spe-cies can take up heavy metals and con-centrate them in their tissue. The plants can be harvested and the con-
With the expansion of industrial production, the soil is becoming increasingly contaminated with heavy metals from industrial effluents. Soil pollution can be primary (by industrial effluents, agrochemicals, and so on) or secondary (by polluted water, air, and so on). Polluted soil itself can become a source of pollution, thus affecting human ...
In Taiyuan city in China, contamination of agricultural soil by heavy metals can occur through different means such as use of sewage water for irrigation for metals like Cd, Cu, Hg, Pb, Zn and Cr or from soil parent material for As and Ni (Liu et al., 2015) .
Even low concentration of heavy metals may inhibit the physiological metabolism of plant. ... Heavy metal contamination of soil and ... Ecotoxicology and Environmental Safety, 66, 258–266 (2007 ...
This contamination can move offsite and affect downstream ecosystems. One remediation strategy that has the potential to stabilize soils, stabalize soil, prevent erosion, and reduce surface runoff, involves active revegetation of mine tailings. Although the revegetation of tailings is a promising remediation strategy, heavy metal contamination ...
Ecological risk assessment of soils before and after leaching and amendment was conducted by growing pak choi, a very popular leaf vegetable in China which is usually employed to assess the ecological risk of heavy metals in soils (Zhou et al., 2005). DTPA extraction was used to assess the phytoavailability of soil residual heavy metals.
The elution of attached substances on the surface of soil particles such as heavy metals will be suppressed, because each particle of soils is coated with impermeable materials uniformly. In order to utilize solid wastes and soils, it has been evaluating the basic properties by laboratory experiments.
A Review of Heavy Metal Contamination of Food Crops in Nigeria Michael Monday Onakpa*, Anoka Ayembe Njan† and Ogbureke Chidiebere Kalu‡ Heavy metal contamination of food crops is an issue of global concern that ultimately results in toxicity and diseases in humans and animals through consumption of contaminated soils and food crops. With a
paper, the sources of heavy metal contaminated soil, the existing soil remediation technology, ... For example, excessive Cd can inhibit the activity of protochlorophyll ester reductase, resulting in photosynthesis disorders and even death of plants. Heavy metals ... in-situ soil elution and heterotopic soil elution…
The metals were extracted from the soil by flushing with a 0.05 M aqueous solution of EDTA sodium salt (E-Na (2)). Cu or Pb extraction efficiencies of about 95 and 98% were observed, respectively ...
Soil pollution by heavy metals is a serious environmental problem worldwide (Li et al., 2014). Elevated levels of heavy metals in soil pose a severe threat to ecosystem sustainability and human health through the food chain (Li et al., 2014; Wang et al., 2018). As one of most key global pollutants, mercury (Hg) attracts great concern
The accumulation of heavy metals in soils and its impact on food safety is of increasing concern. It has been reported that more than 20 million ha of land have been contaminated with heavy metals that can result in the potential health risks to human beings and soil ecosystems. This can potentially jeopardize the food security in China.
To control the ecological risks of heavy metal-contaminated soil more effectively, the present study focused on the combination of soil washing (with FeCl3) and in situ immobilization (with lime ...
Co-contamination of the environment with toxic chlorinated organic and heavy metal pollutants is one of the major problems facing industrialized nations today. Heavy metals may inhibit biodegradation of chlorinated organics by interacting with enzymes directly involved in biodegradation or those involved in general metabolism. Predictions of metal toxicity effects on organic pollutant ...
The influence of these heavy metals on plants and their metabolic activities caused by the geological and biological redistribution of heavy metals through pollution of the air, water and soil were briefly discussed in this article. Keywords: Heavy metal, toxicity, effect on plants, heavy metal pollution and Soil pollution 1. INTRODUCTION
Remediation of heavy-metal contaminated soil by in-situ immobilization. Abst from Soc for Envir Toxicology and Chem Ozark-Prairie and S-Central 1996 Regnl Conf, Stlw, OK. Progress 10/01/94 to 09/30/95 Outputs Contaminated soil was treated with amendments (100 …
In order to solve the shortcomings of the traditional curing agent in the treatment of composite heavy-metal-contaminated soil with the solidification and stabilization method, a new type of cementing material A was used as a curing agent, and the Pb, Cd, Cu composite heavy-metal-contaminated soil was artificially prepared to carry out an experimental study on solidification and stabilization ...
Solution [Soil contamination countermeasures] AMEC is calling for "human- and earth-friendly treatment" for soil contamination. AMEC thinks this a real solution. Note: The paper entitled "Development of materials for removing heavy metals such as arsenic contained in water or soil," was awarded the Technology Excellence Award in 2010 by ...
technology. The treatment of Cd contaminated soil is the same as other heavy metal pollution[4]. There are two main ways: first, solidification, changing the form of heavy metals in the soil, reducing their mobility and bioavailability in the environment; second, removal, Remove heavy metals from the soil.
Excessive accumulation of heavy metals in soils and plants may pose risks and hazards to humans and ecosystems through direct ingestion or contact with contaminated soils…
3. Remediation techniques for hydrocarbon and heavy metal contaminated soil. Internationally, petroleum contamination is widespread, posing serious environmental risks including surface and groundwater contamination (Balasubramaniam et al. 2007).The environment can potentially be affected by numerous operations in petroleum exploration, production and transportation, with …
The coexistence of polycyclic aromatic hydrocarbons (PAHs) and heavy metals has deleterious effects on environmental quality. Few reports have studied the mechanisms of plant inoculation with Piriformospora indica to remediate PAH-metal co-contaminated soil by analyzing the chemical speciation of the contaminants. This study investigated the influence of the inoculation of Medicago sativa …
Treatment of Contaminated Soils with Aqueous Surfactants Science Applications International Corp. McLean, VA Prepared for Environmental Protection Agency Cincinnati, OH Nov 85 U.S. DEPARTMENT OF COMMERCE National Technical Information Service. -------f EPA/600/2-85/129 November 1985 TREATMENT OF CONTAMINATED SOILS WITH AQUEOUS SURFACTANTS by ...
According to an official report recently released by the China Ministry of Environmental Protection 1, 19.4% of the arable land in China is contaminated with heavy metals…
na. The accumulation of heavy metals in soils and its impact on food safety is of increasing concern. It has been reported that more than 20 million ha of land have been contaminated with heavy metals that can result in the poten-tial health risks to human beings and soil ecosystems. This can potentially jeopardize the food security in China.
The input of heavy metals in agricultural systems depresses the soil quality and compromises the food safety owing to crop contamination. Metals also affect the structure, morphology, function, and activity of microorganisms in soils and substrates. Heavy metals can inhibit basic processes of microbial metabolism such as respiration. The present study aimed (i) to assess the …
up of heavy metal-contaminated soils. The goal of heavy metal phyto extraction is to reduce metal levels in the soil up to the acceptable levels with in a reasonable time frame [5]. Nickel, lead and mercury are the micronutrients essential for the soil. They occur naturally in the plant and animal tissue [6]. They are
Organic pollution and heavy metal pollution are the most important types of soil pollution.Repair technology is also mainly biodegradable and leaching and other methods.Surfactants are used in these processes, and biosurfactants have been recognized as the best choice to avoid secondary contamination.Biosurfactant has become a popular research ...
population (4). They are major contributors to the contamination of subsurface environments. The contaminants are chemicals (nitrate, heavy metals, organic toxicants), pathogenic microorganisms, and parasitic cysts. The fate of pathogenic microorganisms in soils and aquifer material is …
