SU1353750A1 - Device for cleaning waste water - Google Patents

Abstract

The invention relates to biochemical wastewater treatment and allows increasing the degree of oxygen used in the air by the liquid being cleaned and preventing clogging of filter. Plates (FP) 3 by suspended substances due to the fact that an air-feed channel is installed along the entire length of the aero tank (A) (VK) 2, equidistant from the side walls of the aerotank. The side walls of VK 4 are formed by OP 3. Initial water is supplied to K, and air is blown into VK. The flow through the pores of the FP 3 into the water and rising, puffing up the air, creates upward flows, as a result of which the wastewater makes a spiral movement along the azrotank or its section, which helps to maintain the active sludge in suspension and better absorption of oxygen. 1 hp f-ly, 1 ill. 4 tab. WITH sd 00 44 cl

Description

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11353750

The invention relates to the field of biochemical sewage treatment and can be used in communal households and in industry.

The purpose of the invention is to increase the oxygen productivity and the degree of its use, as well as to prevent clogging of the filter plates with suspended substances.

The drawing shows a device for biochemical wastewater treatment with activated sludge.

The device includes a body 1 of a corridor-type aerospace with a bottom and walls, along the length of which the air supplying channel 2 is located in the center. The side walls of the channel 2 are formed by pull-pull, plates 3, and the upper part consists of an airtight ceiling. The airbox is equipped with an overflow pocket 4. An airway channel equidistant from the side walls of the aerotank is installed along the entire length of the aerotank or the length of each section. The side walls of the air passage channel are formed by vertically arranged filter plates 3, and the upper part is formed by an airtight ceiling.

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Its height is 0.2–0.7 times the distance from the bridge 5: and the azro tank to the upper edge of the transfer pocket 4. The ratio of the distance between the center of the air Example 1. The aerotank model is in plan dimensions 0.8x0.9 m and height 0.5 m (with overflow height

pocket 0.4 m) placed on the bottom

The supply kienal and the side wall 35 of the air supply channel 2 are formed; aerotank or its section to the distance yy filtering. plates 3 and air from the bottom of the aero-bottle to the upper edge of the airtight ceiling. Height

filter plates. 0.04–0.32 m, and the total surface area of the plates is 0.07– 40 0.58 m. With the help of a compressor, air in the amount of 1 is injected into the air duct. The results of experiments to determine the performance of the device for oxygen 45 W embedded in the table.1.

From the data of Table 1 it follows that there is an interval of optimal values of the ratio h / H. equal to 0.2-0.7j, at which the productivity of the aero- 5Q tank in oxygen is the highest.

The decrease in productivity beyond the indicated interval values is explained by the fact that at lower values of the ratios the circulation worsens. Spiral 1 |, movement of treated water j. q qi water in the aeration tank. This is probably due to the activeness of the active body, due to the fact that the rising of the halo in a suspended state and the best expectancy of the jet spreads out the absorption of oxygen due to the increase of the mass transfer to the larger area of the horizontal horizon. section.

The return flow is 0.5-1.0.

The device works as follows.

Source water is supplied to the aero tension, and air is pumped into the air passage channels with the help of a crissor filter.

The flow through the pores of the filter plates into the water H, lifting upward, the air bubbles create circulating upward flows, as a result of which the waste water begins to spiral out along the aerotank 5 shi of its section: B in the right half - clockwise, in the left - against.

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Testing of the work of the aeration tank for aeration of the fluid was carried out on an experimental laboratory model with a volume of 330 liters, which allowed varying the width of the aerotank from 0.32 to 0.90 m, the height of the air passage channel with the flume plates from 0.04 to 0.32 m; The working height H of the aerotank is determined by the location of the overflow pocket. The length of the aerotank is constant and equal to 0.9 m.

Pressed pneumatic filter aeration systems according to the proposed and well-known methods are placed in the aeration tank in turn. The working area of the filter plates and the air flow for both options are the same. As a known option serves

The air supply channel, which was laid on the bottom of the aerotank, was closed on top of the filter plates, and as a proposed option, it was a lift channel, whose side walls were formed by filter plates and an airtight ceiling. Air flow is 1-3. The mass transfer rate is determined by the known method of sulfite oxidation.

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Example 1. The aerotank model has plan dimensions of 0.8x0.9 m and a height of 0.5 m (with an overflow height

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At high ratios, the performance of the device is reduced due to air leakage.

Example 2. In the model, an aerotonic -g ka with a constant length of 0.9 m, a height of the overflow pocket of 0.32 m and an air inlet channel. And 0.2 m change the width from 0.32 to 0.90 m In this case, the channel is installed at the equidistant distance io from the side walls of the aerotank. The liquid is aerated with air flow 3. The data of these experiments are given in table 2.

From the data of Table 2 it follows that in the 15 interval of the ratio L / 2H, equal to 0.5-1.0, the performance of the aeration tank of the proposed option is higher than in other cases. This is explained by the fact that at such a ratio of the height and width of the aeration tank the hydrodynamic mode in a: erotank, i.e. the circulation movement of the fluid is the best.

Example 3. In the model of the aerotube 25 of example 2 in experiments 2-4, the air feed channel is displaced from the center by different distances (1,, 12), after which the oxygen production of the device is determined by i .3)

From the data of Table 3 it follows that, irrespective of the width of the aero tank, the central location of the air supply channel leads to a maximum 35 value of the device capacity. Va on oxygen.

Example 4, In the aerotank model of Example 2, to compare the results of operation of the device according to the known ° to the proposed method

1 SHITS are installed horizontally in the center of the aero tank and to them through the air supply channel. The width of the aeration tank is 0.64 m, the area of the filter plates and the obrich case x 0.36 m, and the air flow 1 and 3 m / h.

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Comparative data of aero-fluid liquids in models are given in table 4.

From the data of Table 4 it follows that the proposed device increases by 1.5-1.7 times the productivity of the aerotank in oxygen from willows, 8 times increases the efficiency of oxygen utilization.

In addition, during long-term tests of the air supply channel of the vertical and vertical filter plates, under conditions of aeration of phenolic wastewater, it was found that they are practically not clogged with suspended substances.

Claims (2)

1. Device for wastewater treatment, comprising an aerotank case with a bottom and walls, an overflow tray, an air supply channel and filter plates, characterized in that, in order to increase oxygen productivity and the degree of its use, as well as to prevent clogging of pores / filter plates plates by suspended substances, filter plates are installed on the bottom vertically and provided with an airtight ceiling forming an air supply channel, the latter being located along the entire length of the body on an equidistant distance that apart from its side walls, and the channel height is 0.2-0.7 distance from the hull bottom to the upper edge of the overflow channel. 2. The device according to n.ls is applied so that the ratio of the distance between the air inlet channel and the side wall of the housing to the distance from the bottom of the housing to the upper edge of the overflow pocket is. 0.5 + 1.0, Table t Oxygen capacity, g / h with air flow 1 m / h with air flow 3 Oxygen utilization rate,% at air flow 1 at air flow 3 Table 4