JPS6014993A - Batch treating apparatus for activated sludge - Google Patents

Abstract

PURPOSE:To perform treatment of filthy water resonably and under optimum conditions by disposing a measuring section of a densitomerer to a preset height of boundary face of settled sludge and measuring the boundary face of settled sludge at the aeration stage, settling stage, and discharging stage. CONSTITUTION:Filthy water is fed to a batch reaction tank 1 and supernatant liquid after aeration and settling is discharged outside of the tank through a discharge port 3. The data measured by a densitometer 4 having density measuring section 5 fitted to the bottom end are transmitted through a signal line 6 to an operator 7 housing a microcomputer, etc. The results of operation are transmitted appropriately to a display device 8 or to a printer 9 to perform proper display of output. The output of a controller 11 drives a pump 12 to discharge settled sludge 13 to the outside of the reaction tank 1. The height of the density measuring section of the densitometer in the batch reaction tank 1 is set at H0.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a computing device to collect measurement data of the sludge condition for each process, which is an important indicator when operating and managing sewage purification facilities based on the activated sludge method. This invention relates to a batch type viscous sludge treatment device that automatically calculates and performs sewage treatment under rational [1rXIQ suitable conditions].

Each of the above-mentioned indicators is written in a simple format according to the "JIS-KO102r Factory Effluent Test Method" or the "Sewage Test Method".

In the above formula, SVI; sludge density indicator SDI; sludge density indicator MLSS; activated sludge suspended solids concentration Cm of mixing characteristics in the aeration tank
y/l-) SV ; Activated sludge sedimentation rate of mixed acid (30 minutes) [Part] a; Weight of activated sludge suspended matter in mixed axillary sample [■] b;
? Capacity of settled sludge after standing still for 30 minutes in 1000 tne However, the SV in the formula and M L S S H cannot be obtained unless the mixed oil body collected from the aeration tank is analyzed.Also, the SV in the reaction tank is, however, Ho; 19th/15 Sludge extraction H work; It is expressed by the lowest water level of the reaction tank. 1. Recording work of sludge extraction IJ activated sludge pongee fertilizer average i1'+'r'i11 time (SRT)'f is calculated. I can cut it.

Here, SRT is W, and W2 is S: M L S S 11i degrees (at water level H,) C
rhy/1-) A; reaction tank surface area Cm) q; sludge extraction pump flow scene [m/body] t; sludge extraction pump operating time [-/times] n; sludge extraction pump operation number [times/day] above, (6), (7), (8)
Formula Eri-H0XA7. XtXn, expressed as (9).

SV is the ratio of the volume of precipitated sludge and the volume of the sample (1000 mυ) expressed as a percentage after the sample 1000i'a' is kept at standstill for 30 minutes in a measuring cylinder with an inner diameter of 6°5α and a capacity of 1 t.

-Sword, MLSS is the specimen centroid separation method, or 2
Additional details such as paper method 7'1. After separating the suspended solids and liquid by the method described above, the solids were evaporated to dryness to obtain A7 (ratio of solid mass to sample volume [rrq/L]).
] is expressed as n.

The above-mentioned MLSS shows a good correlation with the amount of attenuation that occurs when a light beam or a superluminant passes through the mixed liquid, so that method is adopted and a human t'Lyt densitometer is used as a foot measuring device.

In other words, the conventional batch-type activated sludge treatment method uses a sludge interface meter as a means to determine the interface height of settled sludge, and NiCM
As a means of determining the LSS concentration, each MLSS meter is screened separately7c,'! In addition, the drainage of sludge is often done manually, and the supernatant liquid's 2°C, SVl, SRT%, and optical al.
There was a drawback that no processing was performed in the first place.

The present invention is an NLC device that eliminates the drawbacks of the conventional ones as described above, and allows not only detection of the sludge interface in the reaction tank but also MLSSO foot measurement to be performed with one MLSS meter. At the same time, it is possible to automatically detect the sludge interface. 1) Automatically control sludge withdrawal; 1'I7:
To provide a batch-type activated sludge treatment equipment that enables the calculation of SVi and SRT using a computing device, records the results, and displays the results in 1, and finally discharges waste water in a good condition as supernatant water. purpose.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a batch type activated sludge treatment apparatus.

In the figure, 1 is a batch type reaction tank, where sewage is taken in at the sewage inlet 2, and the supernatant water after precipitation is sent to the outside of the tank at the supernatant water outlet 3. 4 is at the bottom end. With the meter equipped with the concentration measuring foot 5, the signal f' measured by the concentration meter 4 is inputted to the signal line 6 and transmitted to the ZtM calculation device 7, which has a built-in microcomputer and equalizer. nThe calculation result is transmitted to the display 8 or printer 9 as appropriate for displaying the appropriate output.'F 7t, 10 is the information device;
1 is a controller, and the output of the controller 11 moves 12 pumps and discharges the settled sludge 13f2r into a reaction tank i. 1 hole drilling Inside the batch type reaction tank 1, the sludge interface height is set as Ho, the minimum water level is Hl, and the maximum water level is H2.
, the height of the concentration measuring section 5 is set to H6. In addition, Figure 2 shows the measurement operation for each process of the batch type activated sludge equipment shown in Figure 1, and Sl to S4 are I
IFj order operation, ``!fcM1 to M3 are the measurement items measured by the thermometer 4 for each process.

The operation of the present invention will be briefly explained below with reference to FIGS. 1 and 2. 1. The sludge in the reaction tank is at the set sludge interface height H.
6, and the following operation is performed to immerse the concentration measuring part 5 of the densitometer 4.

(1) At the lowest water level H1, the aeration step S1 is started while sewage is flowing in, and from then on, the set time t1
Activated sludge suspended solids concentration MLS in the mixing tank after elapsed time
A measurement M1 of S is performed.

+21 The batch type reaction tank 1 enters the aeration step S2 as the water level rises with the passage of time, and the measured value of IVILSS I! ,ff moves. The set time t1 after the start of the MLSS is set to the minimum time required for the mixed light of the MLSS.
Since the water level at the time of SS measurement can be set approximately equal to the minimum water level height Hl, there is no need to convert the water level at the time of measurement into MLSS.

+31 In the precipitation process S3, the precipitation of sludge is
(MLSS measurement for sludge interface detection M2 is performed at the advanced stage.

+41 If the measurement result of sludge interface detection M2 is higher than the set concentration (for example, 1000 / 1), the sludge interface is
111 means that it is above the foot 5L, so the output signal of the densitometer 4 is transmitted to the output device 7 through the signal line 6, and the output signal of the calculation result is given to the controller 11. After issuing a dispatch command to the pump 12, the process moves to an operation that requires sludge removal.

(51) Furthermore, if the measured value of the sludge interface detection M2 is below the set concentration, it means that the sludge interface is below the concentration measurement foot 5 area, and the sludge is not pulled out.

6) In addition, the above-mentioned sludge drawing operation is performed by the controller 11.
Since the output signal from the f'L'fc timer is set in advance and operated, the pump 12 is automatically stopped when the set time has elapsed, and the discharge of the settled sludge 13 is stopped.

7) The discharge step S4 begins, and when the sludge removal is completed, the sludge interface has a concentration of 1! Since the level is lower than 1J, supernatant turbidity measurement M3 is carried out. If the result of the turbidity measurement is over 100 mm, it is difficult to say that the supernatant is optically clear, so an output signal is sent to the arithmetic unit 7 and the six-report device 10. Abnormality ~ Generate i-report.

B) By performing the above control operations, the sludge y-
The surface is always kept near the set sludge interface height H6, and the l141. of the above formula 'ILs S. The sludge temperature indicator SVi is immediately calculated by the calculation device 7 from the lff result. The calculation formula is shown in formula +11. 1k, activated sludge cell face angle time S RT taking into account the operating time of the sludge drawing pump
The results are output and displayed on the display 8 or the printer 9.

(9) Note that the sludge interface does not need to be H8 or lower, so the precipitation step may be terminated when the sludge interface reaches H8K.

As described above, according to the present invention, the concentration side tail part of the lower end of the concentration meter is supported vertically in the reaction tank in alignment with the set sludge interface height H8, and the measurement signal from the concentration meter is transmitted to the calculation device. Optimal conditions for activated sludge equipment? All calculation results are automatically determined and the sludge interface height is always maintained at one foot by opening the settled sludge discharge side.
Batch-type activated sludge processing bag flt can be used for multiple purposes such as LSS measurement, detection of activated sludge interface, automatic control signal for sludge extraction, supernatant turbidity measurement, and SVI and SRT calculations. There are excellent effects that can be driven under.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a batch-type sludge treatment apparatus showing an embodiment of the present invention, and FIG. 2 is a side leg operation diagram for each famous process showing the operation of FIG. 1. 1... Batch type reaction tank, 2... Sewage inlet, 3...
Supernatant water outlet, 4... Concentration meter, 5... Concentration side leg,
6...Signal line, 7...Arithmetic device, 8...Display device,
9...Printer, 10...Phrenology device, 11...Controller, 12...Pump, 13...Settled sludge.

Claims (1)

[Scope of Claims] (11 An aeration step in which the sewage in the batch reaction tank is aerated over a predetermined period of time, and a sedimentation step in which the sludge in the batch reaction tank is allowed to settle for a predetermined period of time; In the batch type activated sludge treatment equipment which consists of a discharge process in which the precipitated supernatant i & wa in the batch type reaction tank is discharged over a certain period of time, a concentration meter is installed at the height of the precipitated sludge interface, which has been installed in advance. A concentration measuring section is arranged to measure the concentration of activated sludge suspended matter in the reaction tank during the aeration step, and during the precipitation step, 1
A batch type activated sludge treatment device is characterized in that the sludge interface of settled sludge is detected with the same densitometer at a preset time during the discharge process. (2) The batch type activated sludge treatment apparatus according to claim 1, characterized in that the time when the sludge interface of the settled sludge is detected by the densitometer is the end of the settling step. When the sludge interface is higher than a predetermined settled sludge interface height and fc8 when the sludge interface is detected after a predetermined settling time, a drive control command for a predetermined time is given to the pump that pulls out the settled sludge. Batch-type activated sludge treatment apparatus according to claim 1. (4) After the sludge interface height of the settled sludge is detected by the concentration meter, the settled supernatant is removed at a predetermined time. Measure the turbidity of the liquid,
Batch-type activated sludge according to claim 1, characterized in that the batch-type activated sludge is equipped with a calculation device that performs calculation control to generate an abnormality alarm of the processing function when a concentration equal to or higher than the added kiln concentration is detected in advance. Processing equipment. +51 Measurement results of the sludge concentration in the reaction tank using the 4-degree meter and records of the above-mentioned precipitated sludge pulled out.Sludge volume indicators and activated sludge cell average retention time, which are management indicators for the activated sludge method, are automatically entered into the calculation device. The batch type activated sludge treatment apparatus according to claim 1 and claim 3, wherein the amount is calculated and displayed or recorded.