Treatment of Phosphorus in Wastewater by Coagulation with Aluminum Sulfate
DOI: 10.14416/j.ind.tech.2023.08.004
Keywords:
Wastewater treatment, Coagulation, Phosphorus, EutrophicationAbstract
This experimental research aimed to evaluate the effectiveness of chemical coagulation using aluminum sulfate (alum) in reducing phosphorus levels in wastewater from final pond of the aeration lagoon at Ubon Ratchathani University's treatment system. The initial phosphorus concentration was 0.8 ± 0.0 mg/L. The jar test method was utilized, with a 1 liter reactor containing 20, 40, 60, 80, and 100 mg/L of alum in each set of experiments. The chemicals were mixed using a 6-bladed jar test apparatus at speeds of 100 rpm for 1 minute and 30 rpm for 15 minutes. The phosphorus concentration was measured using the ascorbic acid method. Statistical analysis of the data included frequency, percentage, mean, and standard deviation. The results showed that an alum concentration of 80 mg/L resulted in an average phosphorus concentration of 0.002 ± 0.0 mg/L after treatment, with an average phosphorus treatment efficiency of 99.74 ± 0.0%. Using an 80-100 mg/L solution of aluminum sulfate for wastewater treatment can reduce the phosphorus concentration to below critical levels, improving water quality by decreasing phosphorus nutrient contamination to normal levels.
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