By Adrianus Haandel, Jeroen Lubbe

Instruction manual of organic Wastewater therapy: moment version offers with the optimized layout of organic and chemical nutrient elimination. It provides the cutting-edge conception about the numerous elements of the activated sludge method and develops systems for optimized rate established layout and operation.

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Additional info for Handbook of biological wastewater treatment : design and optimisation of activated sludge systems

Sample text

A primary settler (or primary clarifier) may be introduced to remove part of the suspended solids present in the influent. This reduces the organic load to the biological reactor. The settled suspended solids (“primary sludge”) are often sent to an anaerobic digester, together with the activated sludge that is discharged from the biological reactor: the excess sludge. In the anaerobic digester, the volatile suspended solids in the excess sludge are partly degraded, in the absence of oxygen, into methane and carbon dioxide.

For this reason, anaerobic digesters operating in a cold climate usually are heated, which reduces the attractiveness of this process. Under these circumstances aerobic sludge digestion, which is feasible at very low temperatures, may be an interesting option, especially for small wastewater treatment plants. However, in regions with a warm climate anaerobic digestion can be carried out at high rate without the need for artificial heating. Thus, in the tropics it is always advantageous to apply anaerobic digestion, unless the process cannot be applied, for instance due to the presence of toxic material in the wasted sludge, as may be the case for plants treating industrial wastewater.

In that case, even primary treatment quality cannot always be guaranteed. If the activated sludge process is designed for nitrification but not for denitrification, the latter process is likely to occur spontaneously in the final settler, in the absence of dissolved oxygen. Microscopic nitrogen 6 Handbook of biological wastewater treatment gas bubbles will appear, predominantly inside the sludge flocs, causing them to rise to the liquid surface where they will form a layer of floating sludge on the surface of the final settler, which will eventually be discharged with the effluent.

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