Abstract
Oyster mushroom (Pleurotus ostreatus) can be utilized as biocoagulant since it has chitin cell wall. Chitin has characteristics of bioactivity, biodegradability, absorption and could bind the metal ions. In this study, Oyster Mushroom is micronized and mixed with wastewater to treat turbidity and Total Suspended Solid (TSS) using coagulation-flocculation process employed jartest method. Various doses of Oyster mushroom, 600 mg/l, 1000 mg/l, and 2000 mg/l were tested in several rapid mixing rates which were 100 rpm, 125 rpm, and 150 rpm for 3 minutes followed by 12 minutes of slow mixing at 45 rpm. The mixture then was settled for 60 minutes with pH level maintained at 6-8. The result showed that the Oyster mushroom biocoagulant was able to remove 84% of turbidity and 90% of TSS. These reductions were achieved with biocoagulant dose of 600 mg/ L at 150 rpm mixing rate.
Highlights
Coagulation flocculation as a step in water treatment processes is applied for removal of turbidity in raw water that comes from suspended particles and colloidal material [1]
The Total Suspended Solid (TSS) value chart after coagulation flocculation processing based on oyster mushroom variation is presented in the following chart figure: Fig. 1
This phenomenon could be explained by the high content of amine groups in chitin that provide cationic charge at acidic pH and can destabilize colloidal suspension to promote the growth of large rapid-settling flocs that can flocculate
Summary
Coagulation flocculation as a step in water treatment processes is applied for removal of turbidity in raw water that comes from suspended particles and colloidal material [1]. Some of the most commonly used coagulants are aluminum salts, but they have serious disadvantages, such as, production of harmful sludge and indications that their residues in treated water can be harmful for out health [3,4,5] In spite of its undoubtful effusiveness in turbidity removal, aluminum increases concerns towards ecotoxicological impact when introduced into the environment as post-treatment sludge having large volumes [1]. They are still lacking in terms of green chemistry. The given rapid mixing velocity was 150 rpm for 3 minutes followed by slow mixing at 45 rpm for 12 minutes and precipitated for 1 hour
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