SU1491817A1 - Apparatus for automatic control of waste water biological cleaning process - Google Patents

Abstract

The invention relates to wastewater treatment and can be used in automatic control systems in biological treatment facilities. The purpose of the invention is to expand the functionality and improve the efficiency of wastewater treatment of variable composition. The device provides for measuring the flow rates of incoming wastewater and returnable activated sludge, the concentration of incoming contaminants, the concentration of activated sludge and the rate of oxygen consumption in the aeration tank. Depending on the results obtained, control actions are generated on the flows of the incoming wastewater and returnable sludge to maintain the desired treatment mode. The drawing shows the positions: 1 - accumulator, 2 - aeration tank, 3 - settling tank, 4 - metering pump of returnable active sludge, 5 and 6 - metering elements, 7 and 8 - flow meters of wastewater and returnable active sludge, 9 - calculating unit coefficients of the mathematical model, 10 — an organic soil concentration meter, 11 — an oxygen consumption rate meter, 12 — an active sludge concentration meter, 13 — a filtration unit for measurement results, 14 — a two-channel regulator, 15 — a discriminator, 16 — a level gauge. 1 il.

Description

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The invention relates to wastewater treatment and can be used in automatic control systems in biological treatment facilities.

The purpose of the invention is to enhance the functionality and increase the efficiency of wastewater treatment of variable composition.

The drawing shows a diagram of the device for automatic control of the process of biological wastewater treatment.

The device contains a drive 1, aeration tank 2, a sump 3, a metering pump 4 return activated sludge, metering elements 5 and 6 at the inlet and outlet of accumulator 1, flow meters 7 and 8 of waste water and return active sludge connected to the unit

9 calculating the coefficients of the mathematical model of the aerotank 9, the meter 10 of the concentration of organic pollutants, the meter 11 of the rate of oxygen consumption and the meter

12 concentrations of activated sludge combined with blocks 9 for calculating the coefficients of the mathematical model of the aero-tank and block 13 for filtering measurement results. The output of block 9 for calculating the coefficients of the mathematical model of the aero tank is connected to block 13 of the filtering of measurement results and to two-channel controller 14, and the output of block 13 of filtering measurement results is connected to the input of two-channel regulator 14, the outputs of which are connected to the pump 4 of returning active sludge to the discriminator 15 , to the inputs of block 9, to the other input of the discriminator 15 there is connected a level gauge 16 of waste water in accumulator 1. The outputs of discriminator 15 are connected to metering elements 5 and 6.

Block 9 for calculating the coefficients of the mathematical model of the aero tank is a specialized computing device that implements the sliding tolerance algorithm.

The device works as follows.

Analog output signals from flow meters 7 and B of waste water and return activated sludge meter

10 concentrations of organic pollutants, oxygen consumption rate meter 11 and 12 K01 meter

Activation sludge is fed to the inputs of the block 9 for calculating the coefficients of the mathematical model, in which the mathematical model of the process of biological wastewater treatment and measurements in the form of

S | - () - p, X | & () - | -x-H (p- | 4j) (,

R

 SaSx, KS + S

five

0

five

0

five

0

five

0

five

x FS

k, x

LOP R K, p1 where S, S + KjX,

F v sw

P-P, respectively, the concentration of organic contaminants in the aero tank, determined by the rate of oxygen consumption in the aero tank, mg / l, and the rate of its change, mg / l-h; wastewater flow rate, aerotank volume, concentration of organic pollutants in incoming wastewater, mg / l; accordingly, the current maximum specific rates of destruction of organic pollutants in the aeration tank, mg / ch; organic matter half-saturation coefficient, mg / l;

respectively, the concentration of activated sludge in the aero-tank, g / l, and the rate of its change, g / l "h, the flow rate of the returnable sludge, the concentration of the return activated sludge, g / l) the consumption of excess sludge, the growth rate of sludge,

Y / MG-,

dying rate of activated sludge, h i optical density of activated sludge,

oxygen consumption rate, mg / lh,

K ,, K, j, K - coefficients of proportionality.

Ko X, X F "-XR - V

OP

R

In block 9, calculating the coefficients of the mathematical model of the aerotank, the bilinear form of the identification error and the derived values of S and X are formed. In the identification mode, the frequency of which depends on the specific process conditions: composition and concentration of wastewater, activated sludge, organic matter cyclic fluctuations, etc. that is, measurements of the established values of S and X are made for given values of F, FH and 5. The measurement results are used to solve the problem of calculating the kinetics of the Fx coefficients of the mathematical mode li - rt, K. / Mr, by the method of sliding tolerance. The values of the K, .., Ktj coefficients in the measurement equations are determined by comparing the readings of the meters 11 and 12 of the rate of oxygen consumption and the concentration of activated sludge with the results of laboratory analyzes.

For example, when cleaning wastewater of synthetic alcohol plants in V mode 7000 m, F UOO, EY 500, XR 8 g / l, Svt 1050 mg, the following kinetic coefficients were obtained as a result of identification: p 420 mg / g, K , 11U mg / l, | CHV 0.02, / 0.0005. K, 0.48; K ,, 95 mg / mg

To 5.4 mg / g-h.

The identification cycle lasts 1-3 days, and 99% of the time is spent on collecting information and only 1% on calculating the values of kinetic coefficients. After calculating the values of the kinetic coefficients for the same mathematical model in block 9, calculating the coefficients of the mathematical model of the aerotank, the values of p and Xo are calculated for the two-channel regulator 14.

The output signals of the organic concentration meter 10, the oxygen consumption rate meter 11 and the activated sludge concentration meter 12 are also fed to the inputs of the filtering unit 13 of the measurement results. The latter is a computing device that evaluates the main process variables S and X on the basis of a priori information in the form of the same mathematical process model, measurement equations, statistical characteristics

0

Q g

five "

Q

five

five

five

noise measurement and simulation. In this case, the I1plents of the mathematical model and the stationary mode parameters Se and X, obtained in the identification cycle, are used.

The program of block 13 is based on the Kalman nonlinear extended filtering algorithm. The output signals of block 13 are the filtered values of S and l of the main process variables S and X, respectively. The filtered values of § and X are fed to the inputs of the two-channel controller a 14.

Dual channel controller 14 compares the values of S and A calculated in block 13 with the tasks S and X calculated in block 9 and generates

the outputs control signals and provide stabilization of the concentration of contaminants in the treated water by changing, respectively, the cost of waste water and return activated sludge.

When calculating the optimal load on activated sludge, the quantitative and qualitative indicators of the process are taken into account: dissolving waste water in the aeration tank 2, the concentration of organic pollutants in the waste water, the concentration of activated sludge in the aeration tank, bioactivity of the waste water and sludge activity. The last two parameters are taken into account in the form of a complex indicator characterizing the activity of the sludge and the compliance of the species composition of microorganisms or the composition of organic pollutants of the incoming waste water. The value of this indicator is calculated from measurements of wastewater consumption, the concentration of organic pollutants in it, the rate of oxygen consumption and the concentration of activated sludge in the aeration tank. The less specific (per 1 kg of sludge) the rate of oxygen consumption with the same amount of incoming organic pollutants, the less the consistency of the composition of water and sludge, its activity and the calculated value of the optimal load on sludge.

Dual-channel controller 14 is calculated on the basis of the linear proportional controller algorithm for a quadratic functional.

When regulating the flow of waste water in the aeration tank 2 works either up to

71

The sensing element 5 or the metering element 6. The switching of the metering elements and their performance is controlled by the discriminator 15 assembled on the threshold elements. At the command of the two-channel regulator 14 Reduce the flow of waste water into the aeration tank discriminator 15 first reduces the flow of waste water taken from storage tank 1 by metering element 6 until it stops, then turns on metering element 5 and gradually increases its flow rate. Otherwise, at the beginning, the capacity of the metering element 5 decreases, the water in HaKonnTejib 1 is sampled, and after (;. V1shuchart to the level of 1 o.4t ;. t: o,

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Ecj; ji. load on aeroesh-; not or-; :: ii iocKi - .: j.:;i - TT am able to know llas: and, and ;; --ioicioM; about. :. ; pg LiTOvH-ii p. D-and cl. 0-1 tl. ca, h o, d; p; n 11 .-: al - | | nd pfn ui-fr 1. g nepput.f kyg: h-: H Um1 tH tt iodach- stoch oGg of water, increase consumption scoop of silt. When c li s.GHHH organic load; - km. I M K OTj-aM D: -th P G1I; to: tgttora 14 1p o gi. l for ls described j. n iy1.

 . g C i O GOY D De VBf-, n-nb4OO b

with /; g; G31; -;.: Tr / dpot with L5:; :: IMX kv.mig yen then i or / Mc / if tu Tacb aktig ,, uia: |; - igizis about:: l i; ; F; l .rg piccss kim Betn, ef - cham, tg regulator 14 um-ng, pol.t-iy stoch.} POM.p ;; aero

eight

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TeiiK 2, do not change the return sludge flow rate.

Claims (1)

Invention Formula Device for automatic control of biological wastewater treatment process, containing interconnected accumulator at the unit inlet, aeration tank and sump, metering elements at the inlet and outlet of the accumulator, metering pump on the return sludge line, flow meters of organic waste and return active sludge and organic concentration meters wastewater and activated sludge associated with the computing unit, the level gauge in the storage tank and the discriminator connected to the first input to the level gauge, and the outputs with the metering elements, so that with the aim of expanding the functional possibilities of MOKHocTcj and increasing the efficiency of cleaning. g ely water of the alternating state, O: O, is additionally equipped with a block of: measurement of the measurement results, a two-digit controller and an oxygen consumption rate meter, a part with a pneumatic unit, 1 . .ii which is connected with the peri- libi ;-) is the culprit of the channel regulator, and the second is connected with the filter block; vnt of the measurement results, the remaining inputs of which are connected respectively to the meter con, ent The mixers of organic saturation, activated sludge and the rate of oxygen consumption, and the output are from the second inlet, the channel of the regulator, the first of which is connected to 1 | The disc is equipped with a disk breaker and a water metering unit, and the MHC L with a pump is equipped with an a1C sludge metering unit and a computational unit.