| Author | Tariman, Ma. Concepcion A. |
| Call Number | AIT Thesis no. EV-94-30 |
| Subject(s) | Factory and trade waste--Environmental aspects
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of
Engineering, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | The ever-increasing demand for ice cream products by the consuming public has
turned ice cream making into a considerable industry in Thailand. The increased ice cream
production has resulted in high wastewater generation. Wastewater treatment and disposal
costs have also risen in addition to purchase costs of water.
The wastewater generated from processing of ice cream has become the top priority
of Lever Brothers (Thailand) Ltd. as it represents 74 % of the total effluent. This study is
focused on the application of cleaner production concepts highlighting waste segregation as
an effective waste reduction measure.
Cleaning-in-place (CIP) of tanks and freezer lines and washing of Polo filling
machines are the major sources of ice cream wastewater with respective contributions of 43
% and 25 % of the total effluent flow. CIP and Polo filling machine wastewaters with BOD
concentrations of 3,900-12,750 mg/Land 9,200 mg/L, respectively, are strong wastes which
need to be segregated.
The pre-treated final ice cream effluent contains 1,840 mg BOD /L by far exceeding
the IEAT requirement of 900 mg BOD/L. High effluent BOD is caused by low SS removal
(77 % ) during treatment. An inappropriate desludging system, non-immediate removal of
SS, insufficient flocculation, and foul odor emission are the major problems affecting the
existing pre-treatment plant.
An estimated 12 % reduction in total water consumption of the ice cream plant is
envisaged upon implementation of waste reduction measures such as good housekeeping,
water reuse, and waste segregation. The treatment plant efficiency is visualized to improve
when solids removal devices such as screens and a flotation unit will be installed. |
| Year | 1994 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Visvanathan, C.
|
| Examination Committee(s) | Schroder, Hans ;Nagarur, Nagendra N.
|
| Scholarship Donor(s) | The Royal Danish Government (DANIDA) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |