Metal removal from wastewater using peat
peat
Peat has been investigated by several researchers as a sorbent for the capture of dissolved metals from wastestreams. Besides being plentiful and inexpensive, peat possesses several characteristics that make it an effective media for the removal of dissolved metal pollutants. The mechanism of metal ion binding to peat remains a controversial area with ion-exchange, complexation, and surface adsorption being the prevalent theories. Factors affecting adsorption include pH, loading rates, and the presence of competing metals. The optimum pH range for metals capture is generally 3.5–6.5. Although the presence of more than one metal in a solution creates competition for sorption sites and less of a particular ion may be bound, the total sorption capacity has been found to increase. Studies have also shown that metals removal is most efficient when the loading rates are low. In addition, recovery of metals and regeneration of the peat is possible using acid elution with little effect on peat’s sorption capacity.
The utilization of peat and other biomass materials for the treatment of wastewater containing heavy metals is gaining more attention as a simple, effective and economical means of pollution remediation. Pelleting processes can now produce a robust media for a variety of applications where traditional methods of pollutant removal would be economically or technologically difficult.
Utilization of peat for the treatment of wastewater containing heavy metals is gaining attention as a simple, effective and economical means of wastewater treatment. Peat is plentiful, inexpensive and readily available. It also possesses several characteristics that make it an effective media for the removal of dissolved metal pollutants. Peat will accept a wide range of effluent compositions and it removes a multitude of heavy metals.
The mechanism of metal ion binding to peat is an area of great debate and the heterogeneity of peat from different locations and degrees of decomposition, in addition to different experimental methods, makes comparing study results difficult. Theories include ion-exchange, surface adsorption, chemisorption, complexation, and adsorption-complexation. The sorption capacity is dependent on the type of peat investigated and the constitution of the wastewater treated. The presence of multiple metals in solution will create competition for available adsorption sites on the adsorbent surface with certain ions having a higher affinity for sorption than others. While the sorption of individual ions may be lower than if they were present alone, the total sorption capacity will increase. pH plays a crucial role in metal ion sorption by peat. The optimum sorption pH is different for each metal, but a generalized optimum pH range for most divalent metal ions can be considered to be between 3.5 and 6.5. Loading rates of metal-bearing wastewater also significantly influence sorption. Removal of metals is most efficient at low loading rates and as the loading rates increase, the efficiency decreases. Recovery of metals and regeneration of the peat is possible without an appreciable effect on performance.
Metal removal from wastewater using peat
peat
Peat has been investigated by several researchers as a sorbent for the capture of dissolved metals from wastestreams. Besides being plentiful and inexpensive, peat possesses several characteristics that make it an effective media for the removal of dissolved metal pollutants. The mechanism of metal ion binding to peat remains a controversial area with ion-exchange, complexation, and surface adsorption being the prevalent theories. Factors affecting adsorption include pH, loading rates, and the presence of competing metals. The optimum pH range for metals capture is generally 3.5–6.5. Although the presence of more than one metal in a solution creates competition for sorption sites and less of a particular ion may be bound, the total sorption capacity has been found to increase. Studies have also shown that metals removal is most efficient when the loading rates are low. In addition, recovery of metals and regeneration of the peat is possible using acid elution with little effect on peat’s sorption capacity.
The utilization of peat and other biomass materials for the treatment of wastewater containing heavy metals is gaining more attention as a simple, effective and economical means of pollution remediation. Pelleting processes can now produce a robust media for a variety of applications where traditional methods of pollutant removal would be economically or technologically difficult.
Utilization of peat for the treatment of wastewater containing heavy metals is gaining attention as a simple, effective and economical means of wastewater treatment. Peat is plentiful, inexpensive and readily available. It also possesses several characteristics that make it an effective media for the removal of dissolved metal pollutants. Peat will accept a wide range of effluent compositions and it removes a multitude of heavy metals.
The mechanism of metal ion binding to peat is an area of great debate and the heterogeneity of peat from different locations and degrees of decomposition, in addition to different experimental methods, makes comparing study results difficult. Theories include ion-exchange, surface adsorption, chemisorption, complexation, and adsorption-complexation. The sorption capacity is dependent on the type of peat investigated and the constitution of the wastewater treated. The presence of multiple metals in solution will create competition for available adsorption sites on the adsorbent surface with certain ions having a higher affinity for sorption than others. While the sorption of individual ions may be lower than if they were present alone, the total sorption capacity will increase. pH plays a crucial role in metal ion sorption by peat. The optimum sorption pH is different for each metal, but a generalized optimum pH range for most divalent metal ions can be considered to be between 3.5 and 6.5. Loading rates of metal-bearing wastewater also significantly influence sorption. Removal of metals is most efficient at low loading rates and as the loading rates increase, the efficiency decreases. Recovery of metals and regeneration of the peat is possible without an appreciable effect on performance.
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