Can polyaluminium chloride and anionic polyacrylamide remove CD 2+ and Zn 2+?

Water treatment residuals produced after addition of polyaluminium chloride and anionic polyacrylamide (PAC-APAM WTRs) were evaluated for the potential to remove Cd 2+ and Zn 2+ from aqueous solutions by batch adsorption studies.

Can anionic polyacrylamide be used as a coagulant in water treatment sludge?

Also, using anionic polyacrylamide (APAM) as a coagulant in the dewatering process of water treatment sludge has been a regular practice to accelerate the dewatering process and decrease the size of dewatering tanks or ponds in large-scale drinking water treatment plants.

How was Pac-Apam slurry filtered?

The PAC-APAM WTRs slurry was centrifuged at 3000 r/min, and the supernatant was filtered by 0.45-μm syringe filters, and the filtrate was analyzed for Cd 2+ or Zn 2+ concentrations.

Does pH affect PAC-Apam adsorption?

The effects of pH on Cd or Zn adsorption onto PAC-APAM WTRs were investigated by batch studies under the following adsorption conditions: initial concentrations of 100mg/L for Cd 2+ and 40 mg/L for Zn 2+, dosage of 0.1 g PAC-APAM WTRs, solution volume of 0.1 L, temperature of 20 °C, adsorption time of 6 h, and pH ranging from 3 to 9.

Can PAC-Apam adsorbent be used for soil remediation?

The limitation of current soil remediation approaches is the cost and the potential ecological risks. Using PAC-APAM WTRs as the adsorbent for soil remediation can reduce the cost of long-distance transportation and landfilling of the WTRs but also reduce the space occupied by the land resources required for their disposal.

Do PAC-Apam WTRS release al 3+ ions?

It is worth noting that the application of this type of WTRs into soil for remediation is mixing the PAC-APAM WTRs with the contaminated soil at a specific ratio rather than completely replacing the contaminated soils (Hovsepyan and Bonzongo 2009). Therefore, the release of Al 3+ ions from PAC-APAM WTRs is likely limited.