ENVIRONMENTAL CONTROL - BETTER USE OF PRODUCT OR HOW TO MAKE MONEY FROM ENVIRONMENTAL WASTE.

摘要

Protecting the environment from gaseous emissions leads to the formation of a considerable amount of waste. This waste may be greatly reduced by having proper on-line measurements to determine whether the level of potential waste gas is better recycled and used again within the process. Several examples of this cost saving approach will be discussed.When the gas is not at a suitable concentration to be economically recycled and has to be scrubbed, the spent scrubber material may be sold to assist in the manufacture of another product, or may itself become the raw material for production purposes.Examples of this latter approach will be discussed, but in each case rigorous control and analysis of the spent solution is vital if the required quality specification is to be met. Cases of refineries supplying wood pulp plants with "spent caustic" for the digesters and the "production" of building grade gypsum from the scrubbing of power plant stacks will be described.Special attention will be paid to the analytical techniques and the type of on-line analyzer used for the applications.