Kitchen wastewater treatment using air flotation for without and with the addition of enzyme.

• Main Authors: Abellano, Jacqueline O., Lui, ,Eileen Grace L., Soteco, Evan Lawrence F.
• Format: text
• Language: English
• Published: Animo Repository 1999
• Subjects: Water > Purification > Particle removal; Water treatment plants.; Other Chemical Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/10260
• Institution: De La Salle University

Kitchen wastewater from hotels and restaurants was subjected to an air flotation treatment. Two sets of experiments were carried out in this study: with enzyme and without the addition of enzymes. The experiments were varied according to different air flowrates (1500 cc/s, 1800 cc/s and 2100 cc/s) and different aeration times of 2, 4, 6 hours for without enzyme and 6 and 10 of aeration hours for three consecutive days in the case for with enzyme. Samples were collected directly from the air flotation unit and analyzed for oil and grease, total solids (TS), suspended solids (SS), dissolved solids (DS) and the five-day biochemical oxygen demand (BODs). Oil and grease removal after 6 and 10 hours treatment revealed that the addition of enzymes increased the average percentage of oil and grease reduction from 92.45 to 99.83. Percent reductions in total solids, suspended solids and dissolved solids were also increased with the addition of enzymes. Percent reductions in TS, SS and DS for without enzymes were obtained at an average of 65.35%, 83.52% and 74.35%, respectively. In the case for with enzymes, the following average percent reductions were obtained: 78.76% TS, 95.83% SS and 77.95% DS. However, the percent BOD reduction did not improve with the addition of enzyme. This can be attributed to insufficient aeration time and for not adjusting the initial pH of the original wastewater. The Ph values were also measured and registered a reading from 4.63 to 6.52 for with enzymes at 10 hours aeration period. A definite trend in the removal behavior was not observed because of the variability in the initial concentration of the wastewater. In almost all cases studied the higher the gas flowrate and the longer the aeration time, the better was the percentage removal.