RU2327652C1 - Installation for dehelmenthisation of sewage water deposits at water purification stations - Google Patents

Abstract

FIELD: water supply.

SUBSTANCE: invention can be used in community facilities for disinfection of the deposits against helminth eggs. The installation comprises the dehelminthisation chamber with a deposit heater element and the main air duct 2 of the air-blast equipment 1, the sewage water purification tanks, the sewage water deposit mechanic dehydration device 3 connected with the bin 5 by the conveyor 4. The dehelminthisation chamber includes the bin 5 with a lid and loading hatch 8, with thermally insulated outer surfaces. The inner space of the bin 5 is limited by hollow walls pressure-sealed along the bin's edge. The deposit heater element is connected by a pipeline to the main air duct 2 of the air-blast equipment 1 of the sewage water purification tanks and constitutes a pipe located along the bin's walls as a spiral. Inside the tank 5, a spindle with a deposit mixing tool, for example, a conveyor screw, designed for unloading the heated deposit, is installed with props resting on the lid.

EFFECT: creating the energy-saving manufacturable installations maximally employing air heat from air compression inside the sewage purification tank air-blast equipment, for deposit dehelmenthisation.

3 cl, 2 dwg

Description

The invention relates to a device for treating sewage sludge and can be used in utilities for disinfecting sludge from helminth eggs.

There are known facilities for deworming sediment - methanecs (S. V. Yakovlev, Y. A. Karelin and others. Sewerage. Textbook for universities. Ed. 5th. M. Stroyizdat, 1975, p.632). Metantec is a cylindrical reinforced concrete tank with a conical bottom and hermetic overlap, in the upper part of which there is a cap for collecting gas, from where the gas is discharged for further use. The sediment in the digester is mixed and heated using special devices. Depending on the temperature at which deworming occurs, two types of process are distinguished: mesophilic fermentation at t = 30-35 ° C and thermophilic fermentation at t = 50-55 ° C. With thermophilic fermentation, complete deworming of the sediment is achieved.

The process of deworming in energy-intensive methantics is complex, requires the construction of steam boiler rooms. The main disadvantage of methanecs is the explosion hazard during their operation.

The well-known "Installation of deworming of sewage sludge at treatment plants" (N.I. Likhachev, I.I. Larin and others. Sewerage of populated places and industrial enterprises. M, Stroyizdat, 1981, p. 639), including blower equipment for cleaning tanks wastewater with a main duct for supplying air to containers, a device for mechanical dewatering of sludge connected by a conveyor to a receiver of a deworming chamber. The deworming chamber includes a metal conveyor, infrared gas burners installed above it, and an exhaust hood. To maintain the deworming chamber, a control cabinet, a fan unit and automation of ignition and combustion control are required. Rotary compressors are installed for the operation of blower equipment. Sludge, dehydrated in a mechanical device (centrifuge), is fed by a conveyor to the receiver of the deworming chamber, in the lower part of which there are rollers forming a sediment layer of a certain thickness. When moving along the conveyor, the precipitate is heated to t = 60 ° C by gas burners of infrared radiation, as a result of which it is disinfected and an additional decrease in humidity.

This device has the following disadvantages:

The process of deworming in the energy-intensive device due to the presence of additional automatic equipment for servicing the elements of heating the sediment in the chamber. Leakage of the deworming chamber of the device leads to losses in the atmosphere of the heat acting on the precipitate from the heating elements. The blower equipment of wastewater treatment tanks in the device performs only the function of aeration of the latter, the increased air temperature inside the main air ducts is practically not used.

The invention solves the problem of creating an energy-saving, technological installation for deworming of sewage sludge at treatment plants with the most useful use for disinfecting heat sludge from tanks heated for compression in the blower equipment for air treatment of wastewater.

The problem is solved with the help of a deworming unit for sewage sludge at sewage treatment plants, including a deworming chamber with an element for heating the sludge and a main duct of blower equipment for sewage treatment tanks, where the deworming chamber is made in the form of a hopper with a lid with insulated outer surfaces and with hollow, sealed along the contour of the hopper with the walls of the latter, while the element for heating the sediment is connected by a pipe to the main air duct uvnogo equipment containers for waste water treatment and is helically disposed within the cavity of the hopper tube wall. The hopper on the opposite side of the lid is locked by a device for unloading the heated sediment. Inside the hopper with supports on the lid and / or a device for unloading the heated sediment, a shaft with a device mixing the sediment, for example a screw, is installed.

The deworming chamber is made in the form of a hopper with a lid to give the volume of the chamber a closed circuit and the possibility of loading the gross mass of the dehydrated sewage sludge into the chamber.

The hopper is made with hollow walls in order to place an element inside their cavity for heating the sediment.

Sealing the walls of the bunker in combination with their thermal insulation on the outer surface of the latter eliminates the loss of heat generated by the element for heating the precipitate into the atmosphere.

The hopper cover insulated on the outer surface eliminates the effect of atmospheric air on the sediment heated in the hopper.

The element for heating the sludge is a pipe located in a spiral inside the cavity of the walls of the bunker in order to maximize the uniformity of heat transfer of the walls of the bunker to the heated sediment.

The element for heating the sludge is connected by a pipe to the main air duct of the blower equipment of wastewater treatment tanks for the purpose of supplying to the element, removal from it and subsequent transportation to the wastewater treatment tank of air heated by compression in this blower equipment.

The invention is illustrated by drawings, which depict in figure 1 - installation of deworming of sewage sludge at treatment plants; Figure 2 - hopper installation for deworming.

Installation for deworming of wastewater at treatment plants (FIG. 1) includes blower equipment 1 of wastewater treatment tanks with a main duct 2 for supplying air to containers (containers not shown), a device 3 for mechanical dewatering of sewage sludge connected by a conveyor 4 s hopper 5. The internal volume of the hopper 5 (Figure 2) is limited by hollow walls 6 sealed along the contour of the hopper, a lid 7 with a loading hatch 8 and a device 9 for disposing from the opposite lid 7 of the side of the hopper 5 narrow heated sediment. The hopper 5 with a cover 7 is made with thermally insulated outer surfaces. Inside the cavity of the walls 6 of the hopper 5 is located a spiral pipe 10. The pipe 10 is connected by a pipe 11 to the main duct 2 of the blower equipment 3 tanks for wastewater treatment. Inside the hopper 5 with support on the lid 7 and / or on the device 9 for unloading the heated sediment, a shaft of 12 s is installed (for this case) with a screw 13.

The device operates as follows.

The sludge selected from the wastewater treatment tank and partially dehydrated in the device 3 for mechanical dewatering of the sludge is conveyed by the conveyor 4 to the hopper 5 through the loading hatch 8 of the lid 7 of the hopper 5. In the hopper 5, the sludge is mixed by the screw 13 installed on the shaft 12 and simultaneously heated to t> = 60 ° C due to the heat emanating along the entire inner contour of the hopper 5 from its walls 6. The heat circulating air in the pipe 10 is used as a heat agent (t = 90-150 ° C). Elevated temperature air is simultaneously supplied by blower equipment 1 in the wastewater treatment tank, for aeration of the latter, through the main duct 2 and through the pipe 11 through the pipe 10 back to the main duct 2. Due to the insulation of the outer surface of the hopper 5 and its cover 7, the maximum amount of heat coming from the walls 6 of the hopper 5, goes to the heating of the sediment. Heated to the required temperature (t> = 60 ° C) and maintained at this temperature for time (t> = 20 min) in the hopper 5, the sediment is discharged from the hopper 5 through the device 9 for unloading the sediment.

The proposed device for deworming allows for complete disinfection and deworming of sewage sludge at treatment plants in accordance with the requirements of SNiP 2.04.03-85.

Claims (3)

1. Installation of deworming of sewage sludge at treatment plants, including a deworming chamber with an element for heating the sludge and a main air duct of blower equipment for sewage treatment tanks, characterized in that the deworming chamber is made in the form of a hopper with a lid with insulated outer surfaces and with hollow the walls of the latter sealed along the contour of the hopper, while the element for heating the sludge is connected by a pipeline to the main air duct of the blower about the equipment of tanks for wastewater treatment and is a pipe located in a spiral inside the cavity of the walls of the bunker. 2. Installation according to claim 1, characterized in that the hopper on the opposite side of the lid is locked by a device for discharging a heated precipitate. 3. Installation according to claim 1, characterized in that inside the hopper with supports on the lid and / or on the device for unloading the heated sediment, a shaft with a device mixing the sediment with a device, for example a screw, is installed.

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