NOVELTY - The system comprises an anode chamber, a rectangular shaped cathode chamber, a proton exchange membrane, a sliver chloride electrode (2), a rubber plug, a silica gel pipe, a collecting bottle, a acid gas absorbing bottle, a measuring cylinder, two graphite brush electrode (1) and a glass cotton layer. The anode chamber is arranged on an end face of the column. The anode chamber is provided with an air outlet. A side wall of the anode chamber is provided with two sampling ports (3). An end face of the cathode chamber is opened with a liquid inlet (5).    USE - The system is useful for accelerating dehydration sludge of anaerobic composting process by biological electricity.    ADVANTAGE - The system simply accelerates dehydration sludge with less energy consumption.    DETAILED DESCRIPTION - The system comprises an anode chamber, a rectangular cathode chamber, a proton exchange membrane, a sliver chloride electrode (2), a rubber plug, a silica gel pipe, a collecting bottle, a acid gas absorbing bottle, a measuring cylinder, two graphite brush electrode (1) and a glass cotton layer. The anode chamber is arranged on an end face of the column. The anode chamber is provided with an air outlet. A side wall of the anode chamber is provided with two sampling ports (3). An end face of the cathode chamber is opened with a liquid inlet (5). An upper part of the cathode chamber is provided with a liquid outlet (6). The anode chamber and the cathode chamber are separated by the proton exchange film and provided with the graphite brush electrode. The graphite brush electrode and a copper wire are connected with each other to form a closed circuit. The circuit is connected with a resistor and a sliver chloride electrode using a rubber plug. The rubber plug is inserted into the anode chamber. The anode chamber is provided with a sludge port. The cathode chamber is filled with electrolyte. An air outlet of the anode chamber is connected with the silica gel pipe. The silica gel pipe is connected with the collecting bottle. The acidic gas absorbing bottle is connected with the measuring cylinder. Exteriors of the anode chamber and the cathode chamber are provided with the glass cotton layer.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the system for accelerating dehydration sludge of anaerobic composting process by biological electricity.    Graphite brush electrode (1)    Sliver chloride electrode (2)    Sampling port (3)    Liquid inlet (5)    Liquid outlet. (6)