Abstract

Wetlands can act as “metal sinks” and play a vital role in the remediation of metal-contaminated environments. In an integrated steel plant, metal-laden toxic effluents are produced during the production of coke from bituminous coal. Untreated/partially treated coke-plant effluents contaminate the aquatic ecosystems by the release of organic and inorganic pollutants including heavy metals. Heavy metals are persistent in nature and toxic to human beings. Treatment methodologies incorporating natural wetlands and the development of artificial wetlands could be a holistic approach with multiple benefits to treat contaminated coke-plant effluent. Naturally growing emergent macrophytes (Typha latifolia, Colocasia esculenta, Scirpus grossus) can be used for the design of constructed wetlands for the treatment of coke-oven effluent. By studying the metal-specific accumulation in root and shoot, the bioconcentration factor and translocation factor can be calculated and remediation potential for each plant can be evaluated for the design of wetlands. This chapter highlights the feasibility and utility of wetlands (natural and constructed) to remediate metal-contaminated coke-plant effluents.

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