CS239590A2 - Method of sludges dewatering - Google Patents

Description

The present invention relates to the cleaning and suooning of industrial waste and ampoules.

Removing all civilization tasks, suspending that 2/3 can again be found in the amount of wastewater in the breeding habitat where it is far from where the sludge is poured, sc: crumbly material without the need for a market, especially the industry. can zužitkctoku ammonia, also; l known mechanical, chemistry, and loudspeakers. Such decanting, filtering as flocculant and cooking, evaporation, known designs combine the procedures and often perform a multi-step process of extruding from the decanter to bring the filtrate to filtration and reversing the cake. This leads to the addition of high maintenance and low thermal loading to the living media and flocculants, which, without being used together with the waste, can present deficiencies in the exhaust air. dust ·

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JC £ r

1.

In another method, paraffin is admixed with a view to increasing the heat transfer during the drying process. The deficiencies of this process are due to problems with sludge gases such as ammonium, paraffin losses and high investment and operating costs.

Another known method allows draining precipitating means by dewatering the sludge with a heated thin-film evaporator (using vacuum to dryness), and vapor condensates are returned as a cooled wastewater to the clarifier.

The drawbacks of this process are the extremely high investment, operating and maintenance costs. Thin film evaporators act as abrasive agents between the rotating wiper and the cylindrical shell by wear or / or sand particles contained in the sludge. SUMMARY OF THE INVENTION It is an object of the present invention to provide a continuous and automatic process for the production of commercial dry fertilizers, without the use of chemicals, without emissions, for the removal of cleaner, lukewarm, and thus for effluent sewers, with substitutable investment and the highest possible economy. -4-

According to the invention, this object is solved by the features of the significant part of item 1 of the definition of the subject matter.

With the aid of the accompanying schematic drawing, the invention is explained, for example, as follows: from a sludge silo 1 which can be used at different locations for sludge / sludge deposition and digesters, storage tanks biogas plant etc./ with -kaX-dop-ravwj-e-with a dry matter of 4 to 10 $, a pressure-15-bar with a pump 2 to the heater, in a heater that is heated by a 12-s block heating plant by cooling the engine 14 with water and exhaust gases 13, and / or the gases and vapors of the degassing tank 4, the sludge is heated to 180 to 200 ° C. With this temperature, gases (such as ammonia and carbon dioxide) are removed from the sludge. After accumulation at the degassing tank 4, these gases are discharged by a control valve 15 and are combusted in a block heating plant 12 or, by utilizing their thermal content to heat the sludge, condense in a heater to a usable aqueous ammonia solution or by sulfuric acid treatment in the heater. ammonium sulfide. The sludge is conveyed through a pressure of 10 to 15 bar in the heater 6 via a discharge valve to the vaporizer 6. In the evaporator, the sludge is concentrated to about 18% dry matter at about 110 ° C and a pressure of 1.0 bar. The vapors escaping from the evaporator 6 heat the pre-drying device Q. The vapors emanating from the pre-drying device Q again serve to heat the vaporizer 6 after passing through the vapor-compressor 17 driven by the " block heating plant 12. " The sludge from the vaporizer 6 is pumped by the pump 7 to the pre-drying device 3 at " pre-drying the sludge solids to an air inlet will increase the dry matter content at about 100 ° C to about 65 ° C. From the pre-drying device 5, the wet pasty slurry is discharged through the granulator 6 to form the granulate on the drying apparatus. The air is heated to about 95-100 ° C by the condensate vapor condensate from the defroster heating 6 and the pre-drying device 3. The air heating is cooled to about 50 ° C and can be introduced directly into the effluent. On the drying apparatus 10, the granulates are dried on 9θ shaxine they may, after passing through the pre-drying device 10, fill the commercial packaging with the container may be stored in the silo 16.

Claims (10)

rZ-g-SMZ I — Y ¥ E-a u A method for dewatering sludges for the firing and drying of sludges from domestic, commercial, and industrial wastewater, characterized in that the sludge is degassed by the action of pressure and temperature, and then pre-drying / wetting up to about 65> dry matter. 2. A process as claimed in claim 1, wherein a steam tank is used for degassing, and the gas separation from the sludge level is controlled by a control valve. 3. A process according to claim 1 wherein the sludge is discharged from the degassing tank by a pump or a control valve. 4. Method according to claim 3, characterized in that the control of the pump or the control valve is performed depending on the function of the sludge level. IN 5. A method according to claim 1, wherein at least one downcomer -7- water or digester with circulation. $. 4. A method according to claim 1, wherein at least one paddle dryer is used for drying. 7. A method according to claim 4, wherein a belt dryer or fluid bed dryer is additionally used for drying. 8. A method according to claim 5, wherein the sepasin dryer and the fluidized bed dryer are heated by air. 9. A method according to claim 1, wherein the excreted gases are combusted or fertilized by chemicals. 10. A method according to claim 1, characterized in that the gasses of the gases and vapors are removed from the sludge dewatering step 1 to 4 for preheating the sludge dewatering sludge. 11. Process according to claim 1, characterized in that the vapors are condensed after the flooding of points 1 to 4 and 10 and the gas forms an aqueous solution of salmiac. PATENTS RAHA 1 • Z1 v