underflow recycle (очистка сточных вод) gen.

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The configuration for this system reduced to an anaerobic reactor, receiving the influent and underflow recycle, followed by an aerobic reactor.

With regard to relevance to P removal, they found that it was not possible to increase the anoxic zones in this system in order to ensure low nitrate in the effluent and underflow recycles; if, for a selected sludge age and temperature the unaerated mass fraction of the sludge was increased beyond a certain magnitude, the system stopped nitrifying.

Consequently (as discussed earlier in Chapter 5) the secondary anoxic reactor volume was added to the primary anoxic to obtain the maximum nitrate removal and hence the minimum nitrate concentration in the underflow recycle.

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