Zur ökonomischen Bedeutung der biologischen Selbstreinigung

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Abstract
In twelve flowing water (Q 1.04… 30.4 m3/s, 0.5… 1.2 m/s) the self‐purification efficiency in 110 river sections (L 1.3… 26.4 km) is determined as the load difference in kg · d−1 COD‐Mn as well as in g · m−3 referred to the daily passage. In the economical comparison, the self‐purification efficiency is valued as substitution for wastewater treatment plants of the same capacity. At a mean specific capacity of 8.6 g · m−3, the self‐purification efficiency of the investigated waters is equivalent to economical values of 124 · 103… 534 · 103 M km−1 investment costs, 11 · 103… 80 · 103 M · a−1km−1 operating costs and 5… 81 MWh · a−1 km−1 expenditure of energy. The specific capacity in g · m−3 COD‐Mn shows an exponential regression to the degree of saprobity (L = 0.015 · exp (1.7358 · S)). From this empirical model the limits of the self‐purification capacity of aerobic waters by oxygen input can be detected: in respective examples more than 50% of the required oxygen input are due to weirs.

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