COST ESTIMATION MODELS FOR DRINKING-WATER TREATMENT UNIT PROCESSES

Cost models for unit processes typically utilized in a conventional wa ter treatment plant and in package treatment plant technology are comp iled in this paper. The cost curves are represented as a function of s pecified design parameters and are categorized into four major categor ies : construction, maintenance materials, energy and labour. The cost curves sire developed so that cost indices may be used to update cost estimates from the base year. These models can be used to assist in m aking decisions;related to construction of new water treatment facilit ies or modification of existing water treatment processes to meet drin king water standards or provide improved water quality. They can also be used as a part of sophisticated economic evaluation such as the cal culation of cost to benefit ratios.