System and method for recovering heavy metals, fertilizer nutrients and energy in sludge

The invention discloses a system and a method for recovering heavy metals, fertilizer nutrients and energy in sludge. The system for recovering heavy metals, fertilizer nutrients and energy in sludgecomprises a sludge pyrohydrolysis device, a steam boiler, an SRB (sulfate-reducing bacteria) heavy metal separation device, an energy recovery device and a jet device. The system for recovering heavymetals, fertilizer nutrients and energy in sludge realizes fluid lifting, secondary shear grinding of sludge and optimization of screening conditions and biological mass transfer reinforcement of theSRB heavy metal separator and the energy recovery device simultaneously by use of the jet device, metallic minerals, fertilizer nutrients and energy substances in sludge are effectively separated, thedefect that heavy metals cannot fully play resource energy performance and can not be changed into wealth during traditional sludge treatment is overcome, and the effects of simplifying equipment, reducing energy consumption an