Industrial waste derived biosorbent for toxic metal remediation: Mechanism studies and spent biosorbent management (original) (raw)
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Removal of Heavy Metals from Wastewater Using Low Cost Adsorbents: A Review
—The adsorption process is being widely used by various researchers for the removal of heavy metals from waste streams and activated carbon has been frequently used as an adsorbent. Despite its extensive use in the water and wastewater treatment industries, activated carbon remains an expensive material. In recent years, the need for safe and economical methods for the elimination of heavy metals from contaminated waters has necessitated research interest towards the production of low cost alternatives to commercially available activated carbon. Therefore there is an urgent need that all possible sources of agro-based inexpensive adsorbents should be explored and their feasibility for the removal of heavy metals should be studied in detail. The objective of this study is to contribute in the search for less expensive adsorbents and their utilization possibilities for various agricultural waste by-products such as seaweed, algae, chitosan, egg shell and saw dust etc. for the elimination of heavy metals from wastewater.
Heavy metal removal from wastewater using various adsorbents: a review
Journal of Water Reuse and Desalination, 2016
Heavy metals are discharged into water from various industries. They can be toxic or carcinogenic in nature and can cause severe problems for humans and aquatic ecosystems. Thus, the removal of heavy metals from wastewater is a serious problem. The adsorption process is widely used for the removal of heavy metals from wastewater because of its low cost, availability and eco-friendly nature. Both commercial adsorbents and bioadsorbents are used for the removal of heavy metals from wastewater, with high removal capacity. This review article aims to compile scattered information on the different adsorbents that are used for heavy metal removal and to provide information on the commercially available and natural bioadsorbents used for removal of chromium, cadmium and copper, in particular.
2023
The release of massive pollutants amounts continuously because of urbanization and industrialization has caused a big ecological problem worldwide. Due to their activities, effluents of many industries: mining operations, paper/pulp, and batteries, release different heavy metals, including Copper (Cu), Lead (Pb), and Nickel (Ni), into the environment. Heavy metals are of big concern due to their high toxicity, big bioaccumulation susceptibility, and serious threat to humans and ecosystems. Compared to organic pollutants, which are highly influenced by biological and chemical degradation, heavy metals have no degradation into end products using these methods. Therefore, the removal of such metals is considered a big challenge in water purification. For metals removal, different techniques have been applied, such as precipitation, ultrafiltration, and coagulation. However, those applications have many drawbacks: low efficiency, high consumption of reagents, and generation of toxic sludge. In contrast, adsorption considers an effective method for metal removal, owing to the method’s simplicity, economic and versatility, making it the most convenient way for toxic metals removal. Many conventional adsorbents, such as activated carbon and alumina, have been effectively employed. Nevertheless, the biggest disadvantages of using such adsorbents appear to be their price due to high activation costs and limited reusability. Biosorption has lately emerged as a method with several advantages, including minimal cost, ease of use, and great efficacy, even for trace amounts of metallic ions. This paper aims to review the relevant literature regarding the adsorption method for heavy metals removal from wastewater. Different treatments of heavy metals from wastewater and their related features are highlighted. The metals’ toxicity and hazards to health and the environment are also discussed. The application of various materials as bioadsorbents is explored, such as natural adsorbents and industrial and agricultural wastes.
An Overview of Adsorption Technique for Heavy Metal Removal from Water/Wastewater: A Critical Review
International Journal of Pure and Applied Sciences
Heavy metal pollution in the environment and effects on human health is within the most important issues. Because of continuous deterioration of water quality and persisting contamination level it has been observed and concerned by the scientists. Recently, to remove heavy metals from water/wastewater using various methods has been extensively studied. In conventional technologies, heavy metal removal/remediation is provided expensive because of non-regenerable materials used and high costs. Adsorption processes are being widely performed by several researchers for this purpose and various materials have been frequently used as adsorbent. It has been proved that adsorption is an effective method for purification, because of significant advantages including stability, utility, low-cost, ease of operation and performance. As adsorption technology is reduce the heavy metal ions concentrations to very low levels and because of using various low-cost adsorbent materials including biosorbents, clays, activated carbons, zeolites, metal oxides, it has major advantages. Metal adsorption onto adsorbent material, especially on agricultural wastes is a rather complex process because it is controlled by various factors. This process includes complexation, chemisorption, adsorption-complexation on surface and pores, micro precipitation, ion exchange. When used biological materials for adsorption process, some functional groups including sulphydryl, amido, hydroxyl and carboxyl, attach metal ions from water. This paper reviews the available adsorbent materials that have been used to heavy metal removal from water/wastewater and evaluates this technique advantages. Herein, the biosorbents such as banana peel, astragalus, chestnut sheel, natural adsorbents including clay also some artificial materials, like carbon-nanomaterials, zeolites, metal oxides, are reviewed as adsorbent materials for removal of different heavy metal ions like As(V), Pb(II), Cd(II), Cr(VI), Th(IV) and Eu(III) from water/wastewater.
A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment
Materials, 2021
Heavy metal is released from many industries into water. Before the industrial wastewater is discharged, the contamination level should be reduced to meet the recommended level as prescribed by the local laws of a country. They may be poisonous or cancerous in origin. Their presence does not only damage people, but also animals and vegetation because of their mobility, toxicity, and non-biodegradability into aquatic ecosystems. The review comprehensively discusses the progress made by various adsorbents such as natural materials, synthetic, agricultural, biopolymers, and commercial for extraction of the metal ions such as Ni2+, Cu2+, Pb2+, Cd2+, As2+ and Zn2+ along with their adsorption mechanisms. The adsorption isotherm indicates the relation between the amount adsorbed by the adsorbent and the concentration. The Freundlich isotherm explains the effective physical adsorption of the solute particle from the solution on the adsorbent and Langmuir isotherm gives an idea about the eff...
INTERNATIONAL CONFERENCE OF MATHEMATICS AND MATHEMATICS EDUCATION (I-CMME) 2021
Fresh and healthy water is needed in the daily life and life cycles of all species. However, water pollution is currently a major global concern, owing to various factors such as poor sewage treatment, industrial wastes, marine disposal problems, hazardous waste content, and some agricultural wastes. Therefore, several methods and techniques for water and wastewater remediation have been developed. In addition, nanotechnology has gotten much attention in recent decades, and various nanomaterials (NMs) for water remediation have been created. Nevertheless, nano adsorbents (NAs) products are the most appropriate water and wastewater remediation technique for heavy metals since they are simple to use and come with various adsorbents. Furthermore, numerous studies have recently confirmed that NAs materials such as carbon tubes, polymeric, zeolites, metal, and metal oxide have a significant and promising impact on environmental issues. Therefore, this review has focused on the NMs application as an effective adsorbent in the water and wastewater for heavy metals removal.
In recent decades, there has been a significant increase in the amount of heavy metal ion pollutants in water. Given the high toxicity of heavy metal ions, their removal from contaminated water bodies has been a significant concern. Advanced nano-engineered technologies have created new avenues for the treatment of such metal ions. In order to extract the heavy metal ions found in wastewater, it has offered knowledgeable and reasonably priced solutions. Heavy metal ions found in municipal and industrial wastewater can be effectively removed by using nano-adsorbents, which have demonstrated a higher adsorption rate and a higher adsorption efficiency. These drugs are easily recovered from following treatment and have significantly improved operational conditions. By gathering all of the research papers on the synthesis and benefits of nano-adsorbents in the treatment of wastewater contaminated with heavy metal ions, the current review provides the references examination. The other Nano absorbents for scavenging metallic ions are also summarized. Many harmful metal ions can be effectively removed by these nanomaterials, indicating their great potential in this regard
Removal of Heavy Metals from Wastewater by Adsorption
Heavy Metals - Their Environmental Impacts and Mitigation, 2021
Adsorption processes are extensively used in wastewater treatment for heavy metal removal. The most widely used adsorbent is activated carbon giving the best of results but it’s high cost limits its use. It has a high cost of production and regeneration. As the world today faces a shortage of freshwater resources, it is inevitable to look for alternatives that lessen the burden on existing resources. Also, heavy metals are toxic even in trace concentrations, so an environmentally safe method of their removal necessitated the requirement of low cost adsorbents. Adsorption is a cost-effective technique and gained recognition due to its minimum waste disposal advantage. This chapter focuses on the process of adsorption and the types of adsorbent available today. It also encompasses the low-cost adsorbents ranging from agricultural waste to industrial waste explaining the adsorption reaction condition. The cost-effectiveness, technical applicability and easy availability of raw material...
Waste
Heavy metal contamination in wastewater is a significant concern for human health and the environment, prompting increased efforts to develop efficient and sustainable removal methods. Despite significant efforts in the last few decades, further research initiatives remain vital to comprehensively address the long-term performance and practical scalability of various adsorption methods and adsorbents for heavy metal remediation. This article aims to provide an overview of the mechanisms, kinetics, and applications of diverse adsorbents in remediating heavy metal-contaminated effluents. Physical and chemical processes, including ion exchange, complexation, electrostatic attraction, and surface precipitation, play essential roles in heavy metal adsorption. The kinetics of adsorption, influenced by factors such as contact time, temperature, and concentration, directly impact the rate and effectiveness of metal removal. This review presents an exhaustive analysis of the various adsorben...
Use of Low Cost Adsorbents for the Remediation of Heavy Metals from Waste Water
The problem of water pollution is alarming due to various anthropogenic activities. Heavy metals are being released in the water bodies causing heavy metal pollution and also accumulate in the food chain and ultimately affecting human health. Various activities like manufacturing of fertilizers, industrialization, mining, electroplating, smelters etc are responsible for the release of heavy metals in the water bodies. Various heavy metals include Pb, Cd, Cu, Zn, Ni, Cr, and metalloids like arsenic in drinking water causes harmful effects on human health like allergies, hyper pigmentation, skin cancer, neurological disorders, hypertension, cardiovascular diseases, etc. Therefore there is a need to develop and focus on methods to remove heavy metals from the waste water using techniques which are environment friendly, cost-effective and easily available in nature. Bioadsorbents have come up as one of the promising substitute for heavy metal removal because it is readily available in nature and most importantly the waste residues from agricultural activities is utilized in the manufacturing of bioadsorbent for heavy metal ion removal. Various agricultural residues used to remove metal ions are rice husk, sawdust, peanut husk, groundnut husk, wheat bran, sugarcane bagasse, pine needle, salseed husk, coconut coir, cotton stalks etc. The main objective of this paper is to study about bio-adsorbents derived from agricultural wastes and their applications to remove metal ions from waste water