Conventional Sewage Treatment Plants

This section describes a conventional sewage treatment plant, emphasizing the total plant concept.

Conventional plants are best identified by what they do not achieve, namely nutrient removal, demineralization, and the removal of trace organics. Therefore, the conventional plant's performance is usually measured by reductions in suspended matter, BOD, and bacteria.

The processes in conventional plants include 1) pre-treatment, 2) settling, 3) chemical treatment, 4) biological oxidation, 5) disinfection, and 6) sludge conditioning and disposal processes. Figure 7.21.1 shows the interrelationships among these processes. This section does not cover plants that treat special industrial wastes by processes other than those used for domestic waste. In addition, an individual municipal treatment plant may not use all processes discussed in this section.

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