Contactstabilization Activatedsludge Process

A steady-state mass balance on the microorganisms around the stabilization tank (see Figure 7.21.6) yields the following equations:

Vs = [rQ(Xr - Xs + YSJ + YQ(1 - a)SiTj/kdXs 7.25(19) r = XC/(XS - XJ 7.25(20)

where:

SiT = total influent BOD, mg/l Vs = stabilization tank volume, l Xs = MLVSS concentration in the stabilization tank, mg/l

Xc = MLVSS concentration in the contact tank, mg/l a = soluble fraction of influent BOD

All other terms are defined previously. The example assumes that all insoluble BOD (suspended and colloidal) entrapped and adsorbed by microorganisms is stabilized in the stabilization tank.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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