Alkyd resin wastewater treatment using coagulation and flocculation method

• Main Authors: Chua, Ronny Roy Y., Go, Joanna Nicole T., Sebastian, Joshua Daniel C.
• Format: text
• Language: English
• Published: Animo Repository 2006
• Subjects: Water > Purification > Coagulation; Water > Purification > Flocculation; Alkyd resins; Coagulation; Flocculation
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/10010
• Institution: De La Salle University

The alkyd resin wastewater is generated from the batch type condensation polymerization of a dibasic acid and polyfunctional alcohol in the presence of oils or fatty acids (Nemerow and Agardy, 1998). The wastewater from the production of alkyd resins has a high concentration of COD (Chemical Oxygen Demand), TDS (Total Dissolve Solids), and is highly acidic. The high level of these water constituents may cause oxygen starvation and eventually destroy the aquatic ecosystem. In this study, the alkyd resin wastewater was treated using chemical treatment, particularly coagulation and flocculation. Different combinations of dosages of the coagulants (alum, ferric sulfate and combination of both) and flocculant (Agfloc888) as well as the pH and mixing rate were tested to give the best results to reduce the level of pollutants. Results showed that alum worked best at pH 5 while ferric sulfate was at pH 4. using 275ppm dosage of alum together with 500ppm of ferric sulfate with a mixing rate of 120 rpm significantly reduced the COD content of wastewater by approximately 43%. Furthermore, the use of a single coagulant showed that there was just a small difference in COD reduction and it was more economical and convenient compared to a mixed coagulant. It was also noticeable that the percent COD reduction were on the same range regardless of whether single or mixed coagulants were used.