scholarly journals Toxicity and Bioremediation of Heavy Metals Contaminated Ecosystem from Tannery Wastewater: A Review

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Bernard E. Igiri ◽  
Stanley I. R. Okoduwa ◽  
Grace O. Idoko ◽  
Ebere P. Akabuogu ◽  
Abraham O. Adeyi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Critical Evaluation ◽  
Cost Effective ◽  
Fold Increase ◽  
Genetically Engineered ◽  
Tannery Wastewater ◽  
Environmental Technology ◽  
Cost Effective Approach ◽  
Removal Of Heavy Metals ◽  
Near Future

The discharge of untreated tannery wastewater containing biotoxic substances of heavy metals in the ecosystem is one of the most important environmental and health challenges in our society. Hence, there is a growing need for the development of novel, efficient, eco-friendly, and cost-effective approach for the remediation of inorganic metals (Cr, Hg, Cd, and Pb) released into the environment and to safeguard the ecosystem. In this regard, recent advances in microbes-base heavy metal have propelled bioremediation as a prospective alternative to conventional techniques. Heavy metals are nonbiodegradable and could be toxic to microbes. Several microorganisms have evolved to develop detoxification mechanisms to counter the toxic effects of these inorganic metals. This present review offers a critical evaluation of bioremediation capacity of microorganisms, especially in the context of environmental protection. Furthermore, this article discussed the biosorption capacity with respect to the use of bacteria, fungi, biofilm, algae, genetically engineered microbes, and immobilized microbial cell for the removal of heavy metals. The use of biofilm has showed synergetic effects with many fold increase in the removal of heavy metals as sustainable environmental technology in the near future.

Surfactant Washing to Remove Heavy Metal Pollution in Soil: A Review

2020 ◽  
Vol 13 (1) ◽  
pp. 3-16
Author(s):  
Jianghong Liu ◽  
Jian Xue ◽  
Dandan Yuan ◽  
Xiaohang Wei ◽  
Huimin Su
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Soil Washing ◽  
Cost Effective ◽  
Cost Effective Approach ◽  
Long Time ◽  
Protection Agent ◽  
Remediation Of Soil

Heavy metal pollution has pervaded many parts of the world, especially developing countries such as China. The discharge of wastewater containing heavy metals will cause soil pollution for a long time and harm to human health. Soil washing is an environmentally feasible and cost-effective approach for the clean-up of sites contaminated with heavy metals. As a relatively environmental protection agent, surfactants are widely used in soil washing. This paper generalized the methods of remediation of soil from heavy metals, expounded the mechanisms of soil washing by surfactant and the types of surfactants and summarized the application of different surfactants in washing heavy metals from soil. Finally, the application prospects and development trends of surfactant washing heavy metals from soil have been prospected.

scholarly journals Nanoadsorbants for the Removal of Heavy Metals from Contaminated Water: Current Scenario and Future Directions

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1379
Author(s):  
Rohit Kumar ◽  
Protima Rauwel ◽  
Erwan Rauwel
Keyword(s):  
Heavy Metals ◽  
Cost Effective ◽  
Water Current ◽  
Contaminated Water ◽  
Metallic Ions ◽  
Future Directions ◽  
The Past ◽  
Commercial Scale ◽  
Removal Of Heavy Metals ◽  
Current Scenario

Heavy metal pollution of aquatic media has grown significantly over the past few decades. Therefore, a number of physical, chemical, biological, and electrochemical technologies are being employed to tackle this problem. However, they possess various inescapable shortcomings curbing their utilization at a commercial scale. In this regard, nanotechnology has provided efficient and cost-effective solutions for the extraction of heavy metals from water. This review will provide a detailed overview on the efficiency and applicability of various adsorbents, i.e., carbon nanotubes, graphene, silica, zero-valent iron, and magnetic nanoparticles for scavenging metallic ions. These nanoparticles exhibit potential to be used in extracting a variety of toxic metals. Recently, nanomaterial-assisted bioelectrochemical removal of heavy metals has also emerged. To that end, various nanoparticle-based electrodes are being developed, offering more efficient, cost-effective, ecofriendly, and sustainable options. In addition, the promising perspectives of nanomaterials in environmental applications are also discussed in this paper and potential directions for future works are suggested.

scholarly journals Magnetic Graphene Oxide Composites are the Solutions for Sustainable Remediation of Ecosystems

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Lakshmi Prasanna Koduru
Keyword(s):  
Heavy Metals ◽  
Graphene Oxide ◽  
Membrane Separation ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
Cost Effective ◽  
Hybrid Nanocomposites ◽  
Magnetic Graphene Oxide ◽  
Removal Of Heavy Metals ◽  
Potential Applications

Heavy metals are one of the primary contaminants in the environment [1]. Exposure to heavy metals, even at trace levels, is believed to be a high health risk for humans [2,3]. Heavy metals are naturally occurring throughout the earth’s crust [4]. But most of the environmental contamination results from the anthropogenic activities such as mining and smelting operations, industry, and domestic and agricultural use of metals and metalcontaining compounds. Migration of these contaminants into non-contaminated areas as dust or leachates through the soil and spreading of heavy metals containing sewage sludge are a few examples of events contributing towards contamination of the ecosystems [5]. Hence, water is the one of the major routes through which heavy metals and radionuclides may enter the human body [6,7]. The sources of water pollution are shown in Figure 1. The conventional wastewater purification techniques including chemical coagulation, photo degradation, precipitation, flocculation, activated sludge, membrane separation and ion exchange are limited to the removal of heavy metals at trace levels [7-9]. However, adsorption is one of the best methods for the purification of water, owing to its low cost and easy handling of materials [7,10-12]. Moreover, adsorption approaches using commercial activated carbon, micro-filtration and membrane techniques are effective, but their use is limited by the complicated installation process involved coupled with the high maintenance costs of the systems [7,13]. Hence, these drawbacks have necessitated the search for an alternative method which is inexpensive, renewable and cost-effective for the removal of heavy metals from aqueous solutions. Many scientific groups have prepared graphene or graphene oxide (GO) based hybrid nanocomposites for various potential applications [14-17]. The study of literature survey and stability of the GO-based nanocomposites prompted us to survey on graphene oxide and reduced graphene oxide-based inverse spinel nickel ferrite nanocomposites for the removal of heavy metals and radionuclides from water with the purpose of reducing their environmental impact

scholarly journals THE INITIAL ION EFFECT OF HEAVY METALS ADSORPTION BY USING HYDROTHERMAL CARBONIZATION BANANA PEELS

2020 ◽  
Vol 4 (1) ◽  
pp. 08-10
Author(s):  
Nurhaliza Said Mohd ◽  
Rabiatul Manisah Mohamed
Keyword(s):  
Heavy Metals ◽  
Phase 1 ◽  
Chemical Characterization ◽  
Cost Effective ◽  
Hydrothermal Carbonization ◽  
Banana Peel ◽  
Initial Concentration ◽  
Heavy Metals Adsorption ◽  
Removal Of Heavy Metals ◽  
Metals Adsorption

Accumulation of heavy metals in water is of particularly important because it can impact upon human health through possible contamination of food. The use of banana peel was investigated. Hydrothermal carbonization (HTC) was chosen as alternative process. The objective of this project is to synthesize banana peel hydrochars adsorbent via HTC process and to evaluate the heavy metals adsorption performance of banana peel hydrochars adsorbent. Conventional methods in removal of heavy metals require high operational cost, need highly skilled labour, and generate sludge at the end of the operation. Compared to other techniques, banana peel absorbent is a cost- effective adsorbent, easy to operate, environmentally safe and no health risk for the operator. Besides, large quantity of banana peel waste contributes to its significant disposal problem. Thus, this study is expected to solve problems of banana peel, by preparing banana peel adsorbent through hydrothermal carbonization. There are three phases in this project, phase 1 which is synthesis of banana peel based on hydrochars, banana peel was chopped the peels into small pieces. It was then soaked in KOH solution for 2hours and transferred into PTFE and heat for 2hours at 230°C. For phase 2, physico-chemical characterization of banana peels hydrochars by using FTIR. The result obtained shown that all of the content in banana peels will activate the surface of banana peel to enhance the adsorption of the heavy metals. For the final phase, by using AAS, the initial and final concentration of the metals was tested to determine the removal of heavy metals by the prepared hydrochars. The results showed that the removal capacity of the hydrochars increased when the initial concentration of the metals increased. From the research, it can be concluded that, as the initial concentration of the metals higher, the ability of the hydrochars to remove the metals also higher and stronger.

scholarly journals Removal of Heavy Metal from Wastewater using Water Chestnut Shell as an Adsorbent

2021 ◽  
Vol 9 (VI) ◽  
pp. 3113-3120
Author(s):  
Girish R. Jangle
Keyword(s):  
Heavy Metals ◽  
Membrane Separation ◽  
Activated Carbons ◽  
Low Cost ◽  
Chemical Activation ◽  
Cost Effective ◽  
Chemical Precipitation ◽  
Chemical Oxidation ◽  
Cost Effective Approach ◽  
Exchange Membrane

The contamination of water resources as a result of industrial activity is on the rise and is a global concern. The heavy metals found in wastewater are long lasting and non-biodegradable. Contamination with heavy metals over acceptable limits could result in major health problems. Chemical precipitation, chemical oxidation, ion exchange, membrane separation, reverse osmosis, electrodialysis, adsorption, and other technologies are used to lessen the influence of heavy metals on water bodies. Some procedures are extremely costly, energy-intensive, and frequently result in the production of harmful by-products. The use of adsorption as a cost-effective approach for removing heavy metals from industrial wastewater has been examined. The usage of Trapa bispinosa peels/shell as a low-cost adsorbent for wastewater treatment is discussed in this paper. Chemical activation was used to make activated carbons from Trapa bispinosa peels and shells. Activated carbons made from a combination of Trapa bispinosa peels/shells and Phosphoric acid with varying impregnation ratios. The results revealed that the activating temperature for the production of Trapa bispinosa-derived activated carbon is 500℃ (AC). CHNS, X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy were used to analyze the activated carbons.

scholarly journals Cytotoxicity and Bioremediation of Heavy Metals by Highly Resistant Marine Bacteria

2021 ◽  
pp. 48-72
Author(s):  
Enas N. Danial ◽  
Walaa A Majrashi ◽  
Ahlam O. Bin Afif ◽  
Ebtehal S Alamri ◽  
Entesar M. Alhatimi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Marine Bacteria ◽  
Environmental Concern ◽  
Cost Effective ◽  
Human Beings ◽  
Toxic Heavy Metals ◽  
Cost Effective Approach ◽  
Good Potential ◽  
Living Organisms ◽  
Detoxification Mechanisms

Environmental pollution of heavy metals is increasingly becoming a problem and has become of great concern due to the adverse effects it is causing around the world. These inorganic pollutants are being discarded in our waters, soils and into the atmosphere due to the rapidly growing agriculture and metal industries, improper waste disposal, fertilizers, and pesticides. Pollution in industrial areas is a serious environmental concern. Wastewater containing biotoxic substances of heavy metals in the ecosystem is one of the most important environmental and health challenges in our society. Hence, there is a growing need for the development of novel, efficient, eco-friendly, and cost-effective approach for the remediation of inorganic metals (Cr, Hg, Cd, and Pb) released into the environment and to safeguard the ecosystem. Mercury (Hg), Chromium (Cr), Cadmium (Cd), and lead (Pb) are known to cause damage to living organisms, including human beings. In this regard, recent advances in microbes-base heavy metal have propelled bioremediation as a prospective alternative to conventional techniques. Heavy metals are nonbiodegradable and could be toxic to microbes. Several microorganisms have evolved to develop detoxification mechanisms to counter the toxic effects of these inorganic metals. Several marine bacteria highly resistant and capable of growing at higher concentrations of Hg, Cr, Cd and Pb and to evaluate their potential to detoxify. Their detoxification efficiency for Hg, Cr, Cd and Pb indicates good potential for application in bioremediation of toxic heavy metals.

Scientific Insights Into Modified and Non-Modified Biomaterials for Sorption of Heavy Metals From Water

2020 ◽  
pp. 807-827
Author(s):  
Tawfik A. Saleh ◽  
Salawu Omobayo Adio ◽  
Prakash Parthasarathy ◽  
Gaddafi I. Danmaliki
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Environmentally Friendly ◽  
Operating Conditions ◽  
Highly Efficient ◽  
Factors Influencing ◽  
Removal Of Heavy Metals ◽  
Near Future

Adsorption techniques are widely used for the removal of various classes of pollutants from water due to their mild and facile operating conditions. The operations involved in the adsorption techniques are environmentally friendly, economical, highly selective on pollutants, highly efficient and easily operative. However, the adsorption of heavy metals from water using biomaterials (biosorption) is a relatively new and interesting technique which holds a great potential. Its effectiveness in lowering the heavy metals concentration to sub-ppb levels is appealing and has attracted increasing attention. The technique is believed to replace the existing technologies in the near future. This chapter discusses the prospects of biomaterials in the removal of heavy metals from waste water, the modification techniques that can enhance biosorption efficiency, and the factors influencing the biosorption processes.

scholarly journals Role of Bioadsorbents in Reducing Toxic Metals

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Blessy Baby Mathew ◽  
Monisha Jaishankar ◽  
Vinai George Biju ◽  
Krishnamurthy Nideghatta Beeregowda
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Toxic Metals ◽  
Metal Ion ◽  
Lead And Cadmium ◽  
Oil Palm Shell ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Near Future

Industrialization and urbanization have led to the release of increasing amounts of heavy metals into the environment. Metal ion contamination of drinking water and waste water is a serious ongoing problem especially with high toxic metals such as lead and cadmium and less toxic metals such as copper and zinc. Several biological materials have attracted many researchers and scientists as they offer both cheap and effective removal of heavy metals from waste water. Therefore it is urgent to study and explore all possible sources of agrobased inexpensive adsorbents for their feasibility in the removal of heavy metals. The objective was to study inexpensive adsorbents like various agricultural wastes such as sugarcane bagasse, rice husk, oil palm shell, coconut shell, and coconut husk in eliminating heavy metals from waste water and their utilization possibilities based on our research and literature survey. It also shows the significance of developing and evaluating new potential biosorbents in the near future with higher adsorption capacity and greater reusable options.

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