SU829133A1 - Plant for compacting sewage sludge - Google Patents

Description

(54) INSTALLATION FOR SEWAGE DRAINS SEALING

is rather high, which is a significant drawback, especially in those cases when sludge is sent for drying in a drying unit.

The purpose of the invention is to ensure that the productivity is improved by reducing the moisture content of the sediment and regenerating the filter elements.

This goal is achieved by the fact that the filter elements are provided with annular bellows installed at their ends with electrodes and working fluid, and bunker with spring supports, while the vibrators are attached to the bottom surface of the bunker bottom, and the latter is connected with a discharge device in the form of a corrugated nipple.

Figure 1 shows the installation, a longitudinal section; figure 2 - section aa in figure 1.

The installation for compacting the sewage sludge contains a cylindrical body 1 with a lid 2 on which is the pipe 3 for introducing the original sewage sludge. The bottom of the housing 1 has the shape of a cone and is equipped with a nozzle 4. Inside the housing 1 are located with the filter element 5, made for example in the form of a hollow cylinder of simple material. The upper and lower ends of the filter element 5 are enclosed in an annular bellows 6 and 7, in the cavities of which paired electrodes 8 are fixed. The bellows b and 7 are made of an elastic material and filled with a working fluid, such as tap water. The intrafiltration element 5 is equipped with a device for cleaning it, including a shaft 9, onto which scrapers 11 are fixed by means of brackets 10. The gap between the inner surface of the filtering element 5 and the scrapers 11 is set within 1-2 mm. In the lower part of the housing 1 there is a pipe 12 for removal of the filtrate. Through the pipe 4, the cavity of the housing 1 communicates with the cavity of the hopper, which includes a cylindrical body 13, a flat bottom 14 and a lid 15 in which there is a branch pipe 16. At the bottom 14 a pipe 17.1 is attached to the discharge device 18 by means of a corrugated tubing 19, made of elastic material. A corrugated ring 20 is made of the same material, by means of which the bottom 14 is connected to the housing 13. The housing 13 is rigidly fixed to the supports 21, and the bottom 14 is equipped with vibrators 22 and is supported by spring supports 23. A reflective cone is fixed to the brackets 24 under the connector 16 25, interfering with the passage

waves generated by the vibrators 23, in the cavity of the filter element 5.

The installation works as follows.

Before starting, the shaft 9 is driven into rotation and the vibrators 22 are turned on. The speed of rotation of the shaft 9 depends on the performance of the ycTd and is set in the range of 5-15 rpm. Raw sludge from primary sedimentation tanks of sewage purification facilities or activated sludge from secondary sedimentation tanks is continuously fed into the plant through the piping 3. Water entering the original sludge passes through the pores of the filtering element 5 and enters the annular zone between the casing 1 and the filtering element 5, is withdrawn from the installation through the nozzle 12 and sent further to the aeration tanks (not shown) for biological treatment. The sediment particles are retained 1, with the filter element 5 and deposited on its inner surface. When the thickness of the sludge layer exceeds the size of the gap between the scrapers 11 and the filter element 5, part of the compacted sludge is scraped off by the scrapers 11 and under the action of gravity through the pipe 4 is lowered into the hopper. In the bunker, the sludge is subjected to vibration, which is created by the vibrators 22 and is transferred to the whole volume of sludge through the bottom 14, which has the ability to make oscillatory movements in the vertical direction. Under the action of vibration, the precipitate is further compacted, and its moisture content decreases even more.

When the bunker is filled with compacted sludge at 85-95%, the unloading device 18 is turned on and the sludge is pumped to the tanks of the mechanical dewatering shops or drying workshop. The emptying of the bunker is stopped at the moment when the volume of the remaining sediment is 8-10% of the volume of the bunker. The hopper can be unloaded while the unit is running.

Claims (2)

Since after some time the pori of the filter element 5 is clogged with sediment particles, the resistance of the water passage returns and the plant capacity decreases. To restore the estimated throughput of the filtering element 5 and to increase the plant capacity, the filtering element 5 is periodically regenerated. Regeneration is carried out by simultaneously supplying the upper and lower bellows of a series of high-voltage electric current pulses to the electrodes 8, sharply increasing the pressure in the working fluid of the bellows 6 and 7. Under the action of the short-term pressure the bellows 6 and 7 are deformed, with In this way, their ends instantly move towards each other, compressing the water in the annular zone between the filter element 5 and the housing 1. The pressure in the annular zone increases sharply and under the action of this pressure a part of the water from the annular zone moves inside the filter element 5, being displaced from its pores, particles of sediment stuck there and causing separation of a layer of compacted sludge adhering to the inner surface of the filter element 5. After the disappearance of the electrical discharges, the elastic forces ensure the return of the sylphs s and b 7 to the initial position, the electrical pulse frequency and current strength is determined empirically Time rogenratsii filter element 5-10. The use of ring bellows with electrodes provides a quick and highly efficient washing of the filter element, after which its capacity is fully restored and the installation capacity increases. The presence of a corrugated ring, which links the bottom of the bunker with its body, and the position of the vibrators on the underside of the bottom of the bunker contribute to a more active compaction of the sediment and a decrease in its humidity. The proposed facility can also be used to clean liquids from the foreign mechanical impurities in them. The invention The apparatus for compacting sewage sludge, comprising a housing of a sludge compactor with nozzles and filter elements, a device for cleaning filter elements and a hopper for collecting compacted sludge with vibrators, is connected to a discharging device, that, in order to ensure the productivity performance due to a decrease in sediment moisture and regeneration of filtering elements, the latter are equipped with annular bellows with electrodes and working fluid installed at their ends , and the bunker - spring supports, while the vibrators are attached to the bottom surface of the bottom of the bunker, and the connection of the latter with the discharge device is made in the form of a corrugated pipe. Sources of information taken into account in the examination 1. SV Yakovlev and others. Sewer, M., stroiizdat, 1975, p.405. 2. The patent CD1A 4104163, cl. On 01 D 21/24, 1978. 1g: J4rj