Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 278, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2020.111302
Keywords
Advanced wastewater treatment; Powdered activated carbon (PAC); Micropollutants (MPs); Suspended solids (SS); Coagulation; Flocculation; Sedimentation and recirculation
Categories
Funding
- Foundation for Research Support of the State of Rio Grande do Sul -FAPERGS [19/2551-0001865-7]
- National Council for Scientific and Technological Development -CNPq [303.622/2017-2]
- Higher Education Commission of Pakistan
Ask authors/readers for more resources
PAC has shown promising potential in purifying water sources, efficiently removing micropollutants without harmful impacts on the environment. By optimizing parameters like PAC dosing, removal efficiency can be significantly improved. Studies on both batch and pilot plant scales have demonstrated that PAC is an effective and feasible solution for micropollutant removal.
The water reservoirs are getting polluted due to increasing amounts of micropollutants such as pharmaceuticals, organic polymers and suspended solids. Powdered activated carbon (PAC) has been proved to be a promising solution for the purification of water without having harmful impacts on the environment. Parameters such as PAC dosing, wastewater hardness, the effect of coagulant and flocculant were evaluated in a batch scale study. These parameters were further applied on a pilot plant scale for the performance evaluation of PAC based removal of micropollutants concerning the contact time and PAC dosing with main focus on recirculation of PAC sludge. The obtained optimum dose was 10-20 mg/L providing 84.40-91.30% removal efficiency of suspended solid micropollutants (MPs) and this efficiency increased to 88.90-93.00% along with coagulant which further raised by the addition of polymer and recirculation process at batch scale. On pilot plant scale, the concentration in contact reactor and PAC removal effectiveness of dissolved air flotation, lamella separator and sedimentation tank were compared. Constant optimisation resulted in a concentration ranging from 2.70 to 3.40 g/L at dosing of PAC 10 mg/L, coagulant 2.00 mg/L and polymer 0.50 mg/L. PAC doses of 10-20 mg/L with 15-30 min contact time proved best for above 70-80% elimination. The recirculation system has also proved an efficient technique because the PAC's adsorption capacity was practically completely used. Small PAC dosages yielded high micropollutants elimination.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available