Removal efficiency of dissolved organic matter from secondary effluent by coagulation-flocculation processes

Author(s)

Guimaraes, Natalia Rodrigues ^[1] ; Dorr, Fabiane ^[2] ; Marques, Rodrigo de Oliveira ^[1] ; Pinto, Ernani ^{[3, 2]} ; Ferreira Filho, Sidney Seckler ^[1]

Affiliation

^[1] Univ Sao Paulo, Polytech Sch, Hydraul & Environm Engn Dept, Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin & Toxicol Anal, Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING; v. 56, n. 2, p. 161-170, DEC 14 2020.
• Web of Science Citations: 0

Abstract

Wastewater reuse has been widely discussed as an essential strategy to minimize the consumption of drinking water for less noble purposes. During biological wastewater treatment, organic matter is converted into a complex matrix containing a variety of soluble organic compounds. The objective of the present study was to evaluate the removal efficiency of the residual organic load in the final effluent from wastewater treatment plant with a conventional activated sludge process by different coagulants and parameters of coagulation-flocculation process, using dissolved organic carbon (DOC) concentration, molecular weight (MW) size distribution by size exclusion chromatography (SEC) coupled to mass spectrometry (MS), and zeta potential (ZP) analyses. The results showed a DOC removal efficiency up to 45% with iron chloride, and of 38% for aluminum sulfate and 31% for PAC coagulants. ZP was also measured during the procedures and authors conclude that the ZP also does not have a determining role in these removals. SEC and MS assessment was able to detect changes on secondary effluent molecular weight distribution profile after effluent coagulation-flocculation, this technique might be a promising tool to understand the composition of effluent organic matter and be helpful to estimate and optimize the performance of wastewater effluents treatment processes. (AU)

• FAPESP's process: 12/04464-9 - Impact of chemical coagulation on the removal of organic compounds in effluent treated by activated sludge process
• Grantee: Sidney Seckler Ferreira Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50420-9 - Secondary metabolites from aquatic microrganisms and their impact on seafood and freshwater fish aquaculture
• Grantee: Ernani Pinto Junior
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/07914-8 - FoRC - Food Research Center
• Grantee: Bernadette Dora Gombossy de Melo Franco
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC