Response surface optimization of chemical coagulation for solid–liquid separation of dairy manure slurry through Box–Behnken design with desirability function
نویسندگان
چکیده
Discharging livestock manure slurry without proper treatment causes various environmental and sociological problems. Chemical coagulation is a widely used easily applicable method for treating such wastewater. However, the technique requires optimization to enhance efficiency while minimizing chemical usage. In this study, we propose an efficient, low-cost, environmentally safe solid–liquid separation of dairy slurry. Experiments were conducted in laboratory jar tests using investigate impact coagulants, specifically polyaluminum chloride (PAC) cationic polyacrylamide (CPAM), as well pH, on process solid-liquid separation. Preliminary ranges PAC, CPAM, pH estimated through single-factor experiments. Coagulation modeling performed response surface methodology (RSM) with Box-Behnken design (BBD), wherein desired goal each parameter was set maximize reducing dosage maintain residual aluminum (Al) concentrations below water quality standards. Numerical predicted that optimal dosages 75 mg/L PAC 35 CPAM at 7. Under these conditions, removal efficiencies 99% turbidity 97% oxygen demand (COD) achieved, minimal Al concentration 0.045 mg/L. Positive zeta potential values treated confirmed complete negatively charged solids The by BBD aligned experimental results, analysis variance (ANOVA) demonstrated predictability accuracy models. Consequently, study highlights practical application RSM optimizing achieve efficient wastewater maintaining low concentrations.
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ژورنال
عنوان ژورنال: Heliyon
سال: 2023
ISSN: ['2405-8440']
DOI: https://doi.org/10.1016/j.heliyon.2023.e17632