SU684008A1 - Apparatus for automatic control of oxitank silt duty - Google Patents

Description

one

The present invention relates to the biochemical purification of waste water and can be used in the chemical industry.

A device is known for automatically controlling the concentration of activated sludge in an aero-mixer, containing an optical sludge absorbing sensor connected via an optical density meter to a controller acting on the performance indicator of returning activated sludge to the aeration tank. The known device maintains in the aeration tank a predetermined concentration of the activated sludge, measured by the flow of return sludge, recycle it from the secondary settling tank to the aeration tank 11.

The disadvantages of the known device are the impossibility to regulate the sludge regime of oxides combined with secondary settling tanks and the uncontrolled discharge of excess sludge, leading to increased manual labor costs while monitoring the technological regime of the facilities. In addition, optical density sensors are expensive and difficult to operate.

A device is known for the automatic regulation of the oxyteka sludge regime, which contains a kilometer meter, an overflow sludge meter, a uroyl silt sensor, and an actuator. set, 1 on the line of selection of excess sludge | 2j.

The pedostat of the known device is the periodic release of excess silt. COMPLETE YN1 .II mode of technological settings for its processing. The use of the n iiecr device is desirable.

The purpose of the invention is --- HOBi, ii ieinie, the accuracy and reliability of the device is work.

The goal is achieved by the fact that ycrpciiicTBo additionally contains a nrogram regulator, which controversially connects the inputs to the oxygen i flow meter: a level sensor, and the outlet is connected to an isola-1gge; p1n mechanism for extracting excess sludge, an equilibrium regulator, and nerves the input of which is connected to the flow meter () m

oxygen, and the second, with the excess sludge flow meter, the output of the ratio controller is connected with the linear input of the program controller.

The drawing shows a principle device for the automatic regulation of the sludge regime.

The device for automatic control of the sludge mode contains an oxiten 1, a sludge flow meter 2, an actuator 3 on the sludge extraction line, a program controller 4, a ratio controller 5, a level sensor 6 and an oxygen meter 7.

The device works as follows.

In the biochemical treatment of wastewater in oxytic acid 1, oxygen is continuously consumed. Oxygen consumption is proportional to the cleaning rate (growth rate of activated sludge). Oxygen consumption is measured by oxygen flow meter 7. The signal from the oxygen flow meter 7 is fed to the first input of the ratio controller 5. To the second input of the ratio controller 5, a signal is received from the flow meter 2 of excess sludge. The ratio controller 5 changes the flow rate of excess sludge in proportion to the oxygen flow rate, acting on the actuator 3 on the excess sludge recovery line through the line input of the program controller 4.

If the sludge level in the sedimentary part of the Occite 1 reaches the level 6 sensor, the latter acts on the right input of the program regulator 4 and blocks the signal received at its line input. The program controller 4 controls the actuator 3 on the excess sludge recovery line in such a way as to ensure the specified maximum consumption of excess sludge. The blocking of the linear input of the software controller 4 is terminated when the level in the settling tank decreases. When a level sensor triggers, a warning signal is given about the violation of the specified sludge regime of the oksitenok.

With an increase in the organic load on oxytocin, the oxygen consumption increases. The ratio controller 5 proportionally increases the flow of excess sludge. However, with a significant increase in load, it is advisable to discharge the sludge temporarily to stop, in order to guarantee the quality of the treated water. For this purpose, software controller 4 contains a comparison node in which the signal from the oxygen flow meter 7 is compared with a predetermined maximum m. When the set value of the oxygen flow is exceeded, the program regulator 4 blocks its linear input and stops

release id1 exact :) ii.ia from oxiteic, I will act on actuator 3 on the line of selection of excess IC. At the same time, a warning signal is given on salvo discharge of sewage. Lock

the line input of software regulator 4 is removed while reducing the organic load (oxygen consumption).

When regulating the consumption of excess sludge by a gate with a rectangular window m installed in a separate sludge discharge chamber,

associated with an oxypipe pipeline, an actuator position sensor on the excess sludge extraction line can be used as a sludge flow meter. This is possible because

5 that in this case there is a linear relationship between the position of the gate and the sludge discharge. We have repeatedly investigated this dependence in the secondary settling tanks of the Nevinnomyssk Chemical Plant, Kuryanovsk and Ze.1enogradsk {th

aeration (Moscow).

The linearity of the flow characteristic is explained by the combined effect of the following factors.

The sludge in the discharge chamber is supplied with a constant pressure, since the water level in the sump is constant; The sludge discharge piping is connected to a settling piping with a relatively small diameter, the resistance of which is relatively large and increases proportionally to the square of the races; la and.a, due to the influence of these factors, the sludge level in the sludge discharge chamber decreases with increasing flow rates, which ensures the linearity of the specifications.

The proposed device, in comparison with the known one, provides the possibility of regulating the sludge regime of oxytotes sealed in the gas phase, simplifying the design by eliminating structurally complex components: a specialized computer and a dissolved oxygen concentration meter and replacing them with a more complex ratio: programmable controller controller (relay); improving the accuracy of work due to direct measurement of the rate of oxygen consumption by the flow of gaseous oxygen, rather than calculating it from the concentration of dissolved oxygen, the temperature of the sludge mixture, the flow of air and waste water;

improving the reliability of operation by eliminating the dissolved oxygen concentration meter, which does not have sufficient reliability in long-term operation at high concentrations of dissolved oxygen, due to the introduction of a blockage for the discharge of excess sludge at high loads (oxygen consumption).

Claims (2)

1. US patent jYo 3558255, cl. 210-96, 1971. 2. For registration No. 2466761/26, 03/30/77, which made the decision to issue an author's certificate.  -Y