Grey water footprint calculations are carried out using ambient water
quality standards for the receiving freshwater body, in other words, standards
with respect to maximum allowable concentrations. The reason is that the
grey water footprint aims to show the required ambient water volume to
assimilate chemicals. Ambient water quality standards are a specific category
of water quality standards. Other sorts of standards are, for example, drinking
water quality standards, irrigation quality standards and emission (or effluent)
standards. One should take care using ambient water quality standards. For
one particular substance, the ambient water quality standard may vary from
one to another water body. Besides, the natural concentration may vary from
place to place. As a result, a certain pollutant load can result in one grey water
footprint in one place and another grey water footprint in another place. This
is reasonable, because the required water volume for assimilating a certain
pollutant load will indeed be different depending on the difference between the
maximum allowable and the natural concentration.
Grey water footprint calculations are carried out using ambient water
quality standards for the receiving freshwater body, in other words, standards
with respect to maximum allowable concentrations. The reason is that the
grey water footprint aims to show the required ambient water volume to
assimilate chemicals. Ambient water quality standards are a specific category
of water quality standards. Other sorts of standards are, for example, drinking
water quality standards, irrigation quality standards and emission (or effluent)
standards. One should take care using ambient water quality standards. For
one particular substance, the ambient water quality standard may vary from
one to another water body. Besides, the natural concentration may vary from
place to place. As a result, a certain pollutant load can result in one grey water
footprint in one place and another grey water footprint in another place. This
is reasonable, because the required water volume for assimilating a certain
pollutant load will indeed be different depending on the difference between the
maximum allowable and the natural concentration.
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