Carbon source recovery method based on sludge pyrohydrolysis

The invention belongs to the technical field of sludge treatment, and discloses a carbon source recovery method based on sludge pyrohydrolysis. The method comprises the following steps: desanding and deslagging primary sludge and residual sludge generated in a sewage treatment process, and centrifugally dewatering to obtain pre-dewatered sludge and dewatered filtrate; the pre-dewatered sludge is subjected to pyrohydrolysis treatment, dilution heat exchange and centrifugal dewatering, and dewatered sludge and high-concentration organic filtrate are obtained; the high-concentration organic filtrate is acidified by relying on the proliferation of microorganism groups, and then is subjected to nitrogen and phosphorus removal treatment to be used as a denitrification carbon source to return to a sewage treatment plant; and carrying out high-solid anaerobic digestion on the dewatered sludge to obtain biogas, and converting the biogas into electric energy and/or heat energy. On one hand, harmlessness, stabilization,