Method for screening and dewatering urban sludge efficiently

Abstract

The invention relates to a method for screening and dewatering urban sludge efficiently. Sludge in an urban wastewater treatment plant is conveyed to a self-synchronizing translation elliptical vibrating screen for dewatering and screening, and then the urban sludge is dewatered efficiently by a method of a combination technique of chemical agent concentration, liquid tempering and box-type filter pressing. After the method detects the concentration of the sludge automatically, dosing amount is calculated and medicament is automatically added to realize automatic dosing; and a filter pressing and dewatering process can meet the requirements of the modernized wastewater treatment plant, the full automatic operation of a system can be implemented by the control of a PLC system, and operations, such as charge-in, the movement of a filter board, segmental filter pressing, positive and negative aeration, filter cloth flushing, unloading and the like can be completed by the remote control of the PLC so as to relieve the labor intensity of workers. Because of the successful adoption of a segmental filter pressing technique of low-pressure filtering and high-pressure extrusion, the operating efficiency is 2 to 3 times that of the conventional plate-and-frame filter press; and after the sludge is dewatered, the water contents of mud cakes of the urban sludge screened and dewatered by the method are reduced to below 60 percent.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a method mainly suitable for rapid treatment of sludge in urban sewage treatment plants. Background technique [0002] There are four forms of water in sludge: surface adsorption water, interstitial water, capillary bound water and internal bound water. At present, the basic principle of sludge treatment technology at home and abroad is to use different processes for dehydration according to the different properties of various water forms in sludge. [0003] In the operation of sewage treatment plants, in order to remove large debris, such as wood, branches, weeds and other substances, to protect water pumps and other mechanical equipment, maintain operation, and reduce the processing load of subsequent processes, there are generally Grille and grate decontamination machines. Floating debris is easy to rush through the grid and enter the subsequent structures, which...

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Problems solved by technology

[0011] The present invention aims at the low efficiency of grid blockage, large construction area of ​​structures, low efficiency of traditional sludge concentration and dehydration and high water content, low efficiency of mechanical dehydration and high water content and high water content of mud cake in the existing urban sludge treatment method However, it cannot meet the requirements of later sludge disposal and other defects, and provides a method for efficient treatment of urban sludge.

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