Batch separation of silica slurry from Botong geothermal field
Date of Publication
1995
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Chemical Engineering
Subject Categories
Chemical Engineering
College
Gokongwei College of Engineering
Department/Unit
Chemical Engineering
Abstract/Summary
The highly concentrated amorphous silica (approx. 1400 ppm) in Botong geothermal brine, a major concern in the Cold Injection Scheme (CTS) of the Fluid Collection and Disposal System (FCDS) of the Philippine National Oil Company-Energy Development Corporation (PNOC-EDC), was collected by dropping the fluid's temperature and precipitating colloidal silica in a huge baffled thermal pond (TP-1). The collected silica slurry samples from 20 lanes of the TP-1 were characterized physically and chemically. Physical characteristics of the slurry have similarities to pure water. The slurry contains amorphous silica of about 98.7 pure in terms of silica.Chemical properties such as pH and total silica content of the surface water were also determined and both exhibited their dependence on temperature lowering.Several techniques (i.e., sedimentation, decantation, filtration, centrifugation and air/oven drying) have been tested to reduce silica slurry concentration prior to reinjection. Thus, the result of this project will help in developing an alternative method for the proper handling and disposal of geothermal fluid. Analysis was made based on the results of total silica and moisture content determination. The results showed that the basket-type centrifuge filter was quite an effective equipment in the solid liquid separation. Best results were obtained when speed (in rpm) was varied at different time intervals with an operating time of 10 minutes (2 mins for 1165 rpm, 3 mins. for 1555 rpm, and 5 mins for 2425 rpm).
Abstract Format
html
Language
English
Format
Accession Number
TU07015
Shelf Location
Archives, The Learning Commons, 12F, Henry Sy Sr. Hall
Physical Description
69 numb. leaves ; Computer print-out.
Keywords
Silica; Slurry; Sewage--Purification; Separation (Technology); Geothermal power plants; Geothermal brines; Waste disposal
Recommended Citation
Carasus, E., Javier, J. M., & Vidallon, L. P. (1995). Batch separation of silica slurry from Botong geothermal field. Retrieved from https://animorepository.dlsu.edu.ph/etd_bachelors/8872
