JPS58155337A - Sludge volume measuring device - Google Patents

Abstract

PURPOSE:To present an inexpensive and highly reliable sludge volume measuring device by measuring the concentration of sludge and obtaining its reciprocal and using activated sludge suspension concentration. CONSTITUTION:When sludge solution collected in a sv measuring tube 5 is set still for a specified time (30min), it is separated into a sludge sedimentation section 21 and supernatant liquid section 22 with a separation plane between them. The sludge concentration D% of the sludge sedimentation section 21 is measured by an ultrasonic wave sludge concentration meter that consists of an ultrasonic wave transmitter 40, ultrasonic wave receiver 41 and an ultrasonic wave type sludge concentration measuring circuit 42. Measured sludge concentration D% at the sedimentation section 21 is inputted to inverse operation circuit 43, in which 100/D% is calculated. SVI is outputted from the inverse operation circuit 43 from the relation: 100/D%=SVI. Further, the output 100/D% of the inverse operation circuit 43 and MISS % value held by a MLSS value data hold circuit are inputted to a multiplication circuit 44 and both are multiplied.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a device for measuring sludge volume (8v), which is one of the control indicators for activated sludge treatment in a sewage treatment salt plant, and particularly relates to a device for measuring sludge volume (8v) 87) Apparatus I for determining the C28v value without directly measuring it.

[Technical background of the invention and electric point between them]

In order to increase the efficiency of activated sludge treatment at sewage treatment plant I, water temperature s in the treatment tank (aeration tank) is used as a control index.
In addition to the pH value of the bath, the activated sludge suspended matter (hereinafter referred to as ML8B) and the settled sludge volume i (hereinafter referred to as SV) are kept constant. In addition, recently, as the tm index of #i activated sludge, we have been attaching great importance to the sludge volume index (hereinafter referred to as SVI), which is the ratio of 8V/ML88 and is called the Mollmann index, and are conducting measurements thereof.

Therefore, this type of device automatically measures Mbssml and 8 verses, calculates further 2sv/ML8B, and calculates BVI.
The number of girls is automatically calculated.

Hereinafter, referring to FIG. 1, a series of operations of the conventional apparatus will be explained by dividing into two steps.

1) Sampling process... First, valve (1)? (2)
Open the three-way valve (81) to operate the air pump (4), reduce the pressure inside the 5viill constant v151 and ML8811J constant cells (6), and pump the sludge liquid (8) in the aeration tank (ma) to the pipe (9). ), aspirate through nLsaikl
Collect into fixed cells (·) and s v II fixed tubes (To). A level 1tCA is provided to set this sampling amount to a predetermined number (11), and avll constant t
Collect sludge liquid to the level of t&) and collect nine valves (1)
e <x) and three-way valve (close the set, air pump (4)
, and open the atmospheric release valve 911 to set the svm fixed pipe (indicated by atmospheric pressure).

(2) ML88 #J constant process...Next, open the air pressure valve (2) and blow air into the ML88 m constant cell (6) to stir the collected sludge. This is because the sludge floating matter settles at the same time as the sludge liquid collection is completed, so ML8B
After measuring in the measurement area, the sludge liquid was stirred to evenly divide the suspended sludge into layers to avoid any difference in measurement. When stirring of the sludge liquid is finished, close valve 4 and valve (2) and measure MLθ8.

ML8B 18 degree constant is ML8 of transparent material such as glass.
Light emitting lI- and light receiving ao across 8 measurement cells (6)
i11, and at a predetermined timing these machines am,
ML8 by operating oat (to MLS8 #I constant circuit)
8 Dark wrinkles are measured. That is, the light from the projector passes through the sludge liquid in the measurement cell (6) and is received by the light receiver (tiOJs), but since the amount of transmitted light has a certain relationship with the sludge suspended matter concentration, the amount of received light is MLss#jiE can be measured using Then, the MLs8IIl [
The value (-) is held in the ML8B value data hold circuit (5) [3) sv#J footwork phase - Next, the sludge liquid in the four-dimensional transparent body Bv#1IIJ standard official ζ6) is predetermined. time(
For example, if the mixture is allowed to stand for 30 minutes, a 6-part boundary surface is formed between the sludge sediment 1im+ and the upper casing 1im+. The first position of this boundary surface is connected to the Nervo machine 11-, and the 98mm constant projection light-
Detected by a photoelectric switch consisting of one and a receiver) directly two! A position signal is generated from the potentiometer (b) of the L% cap. 7 Therefore, this time 1 m II No. 8
Ma measurement circuit ＼: outputs a constant value as svsm(-).

L435vIv&calculation... 8v- added in the column as above and MLEIS value UsvI value calculation circuit-C Two people,
Here, the SV/MLSB calculation is performed to obtain the 8VI value.

(5) # Output/cleaning work type... Once the above adjustment operations are completed, check the valves (1), (ja) and three-way valve -).
Operate the air pump using the air pump, pressurize it by putting air into it from the top of the 8-meter fixed tube, and pipe the sludge liquid in the % svl [I fixed tube and the MIt88 measuring cell to the boiling section. )
discharge through. Next ≦ 2. When the sludge liquid has been discharged, close the valve (1), open the washing water valve and introduce fresh water, and put it into the 8-marker fixed tube (and the ML8B measuring cell (@)). Collect fresh water 0 Then, open the air introduction valve ■ to introduce air and bubble it to the SV koji fixing tube (5) and measurement cell (6).
).

After cleaning, the cleaning water is discharged in the same manner as in the discharge step.

The conventional example of the sludge volume and sludge volume indicator measuring device has been explained above from Figure 1 and Figure C2. Because the structure is complicated and there are moving parts, the gi-noodle properties were not sufficient. Therefore, the SV, 5Vxa, which have a simple structure and no moving parts and are highly reliable,
It was requested that it be kept in place.

[Purpose of the invention]

The purpose of the present invention is to have a simple structure, no moving parts, and high reliability.
Another object of the present invention is to provide an inexpensive sludge volume measuring device.

[Overview of the invention]

In the present invention, a predetermined volume of sludge liquid is deposited in a measuring pipe, and after leaving it to stand still for a predetermined time, the degree D (chi) of the precipitated sludge is determined, and the reciprocal of this sludge degree 1oo/D is determined. Cfk
) is calculated, and the activated sludge suspended solids (ML8B) concentration (-) that was kept constant at the time of sludge liquid collection (-) and the reciprocal number 10
Multiplication by 0/D(II) I: sludge volume SV (-)
It was good to achieve the desired 6 target by doing 62.

Examples of the invention] An embodiment of the present invention will be described with reference to FIG. 112. I will clarify.

#! In the case of 2, the sign (1) to (b), - to -1-)
, - are omitted because they are FiJ11 Figure 04 & US example and 6 tatami mats, so the explanation will be omitted. The seagull, sl, is the side 4I near the bottom S of the measuring tube (i) (the position at a height of 10- or less than the height of the predetermined answer of the scooping officer (11))! It is a good ultrasonic transmitter and receiver. - is the ultrasonic sludge measurement one-way, the ultrasonic transmitter -1 ceramic receiver - constitutes the ultrasonic sludge concentration needle, 0- is the reciprocal calculation circuit, and the ultrasonic sludge a placement This is a circuit that receives the leather g D ()) obtained from the constant circuit and calculates its reciprocal 100/D (rice cake). Clear is a multiplication circuit, and a reciprocal calculation circuit - tlt 100/D
(S) Mx, sa value f -1*-ru)'M path (b)
Multiply the MLSg value (-) held by sv
Output as value (S).

Next, the operation of the sludge volume constant device according to an embodiment of the present invention having the above-mentioned 12 configurations will be explained. The suspended sludge that was collected at 8 m (6) and dispersed in the 1 f (1 m) of the sludge bin was measured in the measuring tube after a certain period of time (30 minutes) had elapsed. It precipitates at the bottom of the. That is, it is chained to the precipitated part, and its degree of condensation is 100/8V (%). Therefore, the sludge in the settled j# part -ffiD (chi) is 0G D ()) -5v(s)X MLSg (S) --
---It becomes 1. Therefore, from the definition of 8v construction, as shown in equation (1), the sludge in the settling part is D ('%)
By adding - and then calculating C2100/D (*), the SV engineer can find it.Furthermore, as shown in equation (2), 1
5v(1) can be obtained by multiplying 00/D(-) by MLSg(9II). Whale fl of the present invention
tFi* MIJSB and sediment part dirt 12111 [
The trick is to set svx and 8v by -1.

Next, a series of Owb productions using this device will be explained following 111j11r-1.
) MLSBm foot process, [5] Rice discharge and washing process are the same as the conventional example, so U light is omitted. When the sludge layer is allowed to stand still for a predetermined period of time (30 minutes), a sludge wrinkle part (-) and a supernatant part (6) bifurcated boundary surface 1 is formed, so that the ultrasonic transmitter 1 ultrasonic receiver... The sludge D (≠) of 1 B ml of sludge is measured using an ultrasonic sludge machine measuring needle consisting of 1 and an ultrasonic sludge section. In other words, the ultrasonic waves frequently emitted from the ultrasonic transmitting signal propagate through the 8-meter constant tube (Shunnaka no sludge & Tono Ikuto 1) and are received by the ultrasonic receiver (1). Ultrasound that was done! Since l1iI wrinkles have a certain relationship with sludge concentration,
It is possible to keep the sludge concentration constant using the reception strength. (4) Calculation of the BYI value and 8ma value.
(*) F! Back calculation calculation circuit-l: Manually done, 100/D
(ch) Kame Rashi, 100/n(S) x svx
The relationship (from the previous E(IF), 8 machining is the output from the inverse calculation circuit - O, and the output of the inverse calculation circuit - 100/D
(11) and M18a value data book - Rudo Island (2)
The 9 MX, 88 (%) value held in is input to the multiplier-route 1 and multiplied.

5v (5G) can be found from the relationship (previous memory formula),
0 output from the multiplication circuit [Effects of the Invention] According to the present invention, 62 predetermined capacities of the sludge basins in the measuring pipe are
The sample was taken and left to stand for a specified period of time to precipitate to a value of 0.
(9I+) is measured with an ultrasonic sludge #1 degree needle that has no moving parts, and the reciprocal 100/D (饅) of the sludge concentration is determined by the reciprocal tI [calculated using an arithmetic circuit, and is constant at the time of sludge acquisition. Multiply the held activated sludge suspended solids (Mbss) lit (*) and iu arrangement 00/D (*) by -6 to find the sludge customer 1 isv (%), so I decided to use a photoelectric generator. It is possible to provide a highly reliable and inexpensive ftJ gripping amount constant device without requiring a compound svm constant mechanism that combines a switch, a servo mechanism, and a potentiometer. The sludge trough l index can also be obtained as the output of the S circuit, which is a simple method. 111 is a system diagram showing an embodiment of a device for constant sludge volume according to an embodiment of the present invention.

4...Air pump 5.8V selection tube 6...ML
Bg measurement self - Aeration tank 8...Sludge 1 [lO-level needle 14...Light emitter S tS - Light receiver 16...
-MLssm constant 1 path 1'/-...Mu, 8B value data hold circuit 21...
・Sludge sedimentation section 4-Hakuichi Kamizuketanbe Ultrasound/Transmitter
41・-Ultrasonic receiver 42・-Ultrasonic sludge lK measurement circuit 6... Reciprocal calculation circuit I・-Multiplying circuit Substitute salt Patent attorney Inoue - Male 1st 2nd figure

Claims (1)

[Claims] Take a predetermined volume of sludge liquid from Section 2 of the rail pipe, and measure the concentration D(-) of the precipitated sludge after allowing it to stand for a predetermined time.
2. Calculate the inverse of this sludge Ia degree, 1 It100 / D (voice), and calculate the activated sludge suspended matter (MLss) 11K (91) that was determined and held at the time of sludge liquid collection and the reciprocal 1.
By multiplying by
) Sludge capacity measurement 1 characterized by determining
1 #1.