Raw sugar and refinery practice at CADPI, Nasugbu, Batangas, Philippines : Special topic : Air pollution modelling of Hydrogen Sulfide (H2S) from a wastewater treatment plant using gaussian plume dispersion equation

Date

12-2015

Degree

Bachelor of Science in Chemical Engineering

Major Course

Major in Sugar Technology

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Casiano S. Abrigo, Jr.

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

Raw sugar manufacturing and refined sugar processing were observed during the field practice from April to May 2014 in Central Azucarera Don Pedro, Inc (CADPI).The students computed the raw recovery and refining yielsd, and the energy requirement of the factory based on the parameters used in CADPI. The recovery and refining yield were 1.58 piculs of raw sugar per ton cane and 1.16 l-kg of refined sugar per picul of raw sugar used, respectively. The total bagasse consumption of CADPI was 101.04% of the amount of bagasse produced in CADPI. Aside from studying the unit operations present in the raw sugar factory and refinery, the author modeled the hydrogen sulfide (H₂S) gas dispersion from the equalization tank and anaerobic lagoons using Gaussian dispersion equation. The study aims to show the H₂S gas dispersion at different atmospheric stability conditions, surfacer wind speed and wastewater pH, and to plot the area of dispersion using contour graphs in PTC MathCad 15.0 (trial version). The distances where the people will be exposed to Occupational Safety and Health Administration Ambient Air Quality Standards (NAAQS) for industrial sources and odor threshold concentration limits were also calculated. Results of the model showed that stable atmospheric conditions, high wind speed and acidic wastewater pH increase the distance traveled by the H₂S gas and do not favor fast dispersion along the crosswind and downwind direction from the emission source. Since the 10ppm H₂S concentration limit set by NIOSH is computed to be within 200m from the wastewater plant, residents near the factory are safe from the harmful effects of H₂S exposure. Wastewater treatment employees are also advised to wear their NIOSH-approved protective equipment when the H₂S gas concentration reaches 10ppm. The farthest distance from the source where protective equipment should be worn is 178.15m. This scenario occurs at stability class F when there is surface wind speed of 3m/s, simulated wind speed in anaerobic lagoons of 3m/s, H₂S gas exit velocity from anaerobic lagoons of 0.001395m/s and wastewater pH of 4.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993 2015 E62 /P33

Document Type

Thesis

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