Comparing Hydrolyzing To Prehydrolyzed Coagulants For Treatment Of A Florida Slough

Keywords

Aluminum chlorohydrate (ACH); Aluminum sulfate; Coagulants; Dissolved organic carbon (DOC); Ferric chloride; Ferric sulfate; Polyaluminum chloride (PACl)

Abstract

Bench-scale jar testing was conducted to compare the cost and performance of three hydrolyzing and two prehydrolyzed coagulants for treatment of an organic-laden (>8 mg/L total organic carbon) surface water slough. Coagulant dose and pH were varied between 80 and 240 mg/L and 4 and 8 pH units, respectively. Dissolved organic carbon (DOC) removal performance data were depicted graphically and modeled using empirical regressions. Ferric chloride and aluminum chlorohydrate achieved the highest organic removal (85 and 70%, respectively) and color reduction (98 and 97%, respectively) at dose concentrations of 120 mg/L as FeCl3 and 100 mg/L as polyaluminum hydroxychloride, respectively. Cost diagrams were developed using DOC removal performance data. Ancillary effects including alkalinity retention, settling time, and sludge settling rates were also considered in this comparison. This research provides insight regarding the relationship between process conditions and the advantages of using prehydrolyzed coagulants for DOC and color removal from surface water.

Publication Date

2-1-2016

Publication Title

Journal of Environmental Engineering (United States)

Volume

142

Issue

2

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1061/(ASCE)EE.1943-7870.0001021

Socpus ID

84955118875 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84955118875

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