NOVELTY - Processing biochemical sludge, comprises centrifuging the biochemical sludge and then drying in a rotary dryer to obtain dry sludge, crushing the dry sludge and then mixing with powder or coal and drying medium, performing direct or mixed combustion of dry sludge with the power generated by coal ash slag after filtering alkali fusion, adding acid to precipitate and then filtering to obtain filtrate, washing, drying and calcining the precipitate to obtain white carbon black, adding alkali in a secondary filtrate, and filtering and collecting precipitate and then washing, drying and calcining.    USE - The method is useful for processing biochemical sludge (claimed).    ADVANTAGE - The method is capable of effectively processing the biochemical sludge with reduced energy consumption in an eco-friendly manner.    DETAILED DESCRIPTION - Processing biochemical sludge, comprises: (a) centrifuging the biochemical sludge and then drying using a rotary dryer to obtain dry sludge, where drying medium is boiler flue gas; (b) crushing the dry sludge and then mixing with powder or coal as boiler fuel and drying medium; and (c) performing direct combustion or mixed combustion of the dry sludge with the power generated by the coal ash slag after filtering alkali fusion, adding acid to the precipitate and then filtering to obtain filtrate, washing the precipitate and then drying and calcining to obtain white carbon black, adding alkali in a secondary filtrate, and filtering and collecting precipitate and then washing, drying and calcining to obtain red iron oxide. An INDEPENDENT CLAIM is included for a system for processing biochemical sludge, comprising a drying device, a boiler combustion device, and an chemical raw material extraction device, where: the drying device comprises a biochemical sludge storage tank (1), a conveying belt (2) and a rotary dryer (3) connected with a flue gas pipeline; the gas pipeline is provided with a fan; an outlet of the rotary dryer through a conveying belt is connected with a crusher (5); the crusher is connected with a boiler through the conveying belt, the boiler is connected with a smoke pipeline; an ash slag outlet of the boiler is connected with a high temperature alkali furnace through the conveying belt; the high temperature alkali furnace is connected with an alkali washing tank (11); a liquid outlet of the washing tank is connected with a deposition outlet of the alkali washing tank and a dryer; and an acid cleaning tank is connected with a dryer through the conveying belt.    DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a system for processing biochemical sludge.    Storage tank (1)    Conveying belt (2)    Rotary dryer (3)    Crusher (5)    Alkali washing tank. (11)