A technique can be used to obtain content from a content-originating device. The compounds may be bonded to inorganic or organic carriers. An electric machine which can function both as a motor and as a generator is connected to a third one of the rotational members. The present inventive method is capable of treating waste water efficiently for a long period in a stable manner at reduced temperatures as compared with the substantially higher temperatures and pressures used in many of the prior art methods. The storage capacitor stores a storage capacitance voltage, Vcs. In an embodiment, a fan operates with a reduced speed which maintains a desired operating temperature.