JPS58143806A - Solid-liquid separation method - Google Patents

Abstract

PURPOSE:To attain to reduce running cost, by adjusting the amount of an electrolyte coagulant for solid-liquid separation added to a liquid to be treated so as to neutralize the ionicity of a separated liquid or to bring the same to a state near to neutralization to supply the coagulant in a proper amount. CONSTITUTION:A liquid to be treated such as sludge supplied from a first storage tank 1 and an electrolyte coagulant supplied from a second storage tank 2 are subjected to coagulation and mixing treatment in a mixer 3. The coagulated liquid to be treated is supplied to a belt press type dehydrator 4 to be subjected to filtering and dehydrating treatments in the power dehydrating part 5 thereof and subsequently receives press dehydrating treatment in the forced dehydrating part 6 thereof by first and second filters 7, 8. The separated liquid and waste water 10 used in washing the filter cloths are recovered by a gathering drain passage 11 and temporally stayed in a stay tank 12. In this tank 12, the ionicity of the separated liquid is measured by a measuring apparatus 13 to put the measured value in a decision mechanism 14 and an emitting volume changeable pump 15 is automatically operated based on the decided result to supply the coagulant in a proper amount.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-liquid separation method in which an electrolyte flocculant is completely added to a liquid to be treated, a coagulation multiphase treatment is performed, and then a solid-liquid separation treatment is performed.

In the above method, the solid content is made into flocs with a large diameter in the form of fine particles, and the recovery efficiency of the solid content is the same as that of the above method. In order to reduce running costs, it is necessary to supply just the right amount of flocculant. -f: Trowel, conventionally - Measure the contamination density/f of the liquid to be treated, and the measured density 1wπ
The amount of flocculant added is adjusted accordingly. However, at present (1) the detection level of the pollution concentration is low, and even if the degree of incorporation of fine particulate solids becomes poor, it may not appear as a change in the pollution level. There is a hometown.

In the present invention, in view of the above points, the degree of concentration (Vc) is adjusted according to the amount of flocculant added to the liquid to be treated and the property VC of the liquid to be treated.

Next, embodiments of the method of the present invention will be explained based on all illustrative drawings.

'Porridge/storage tank (11 power, supply, human waste and city 1
The liquid to be treated such as sludge generated in the treatment of various types of water such as water or industrial wastewater, and the electrolyte flocculant completely supplied from the J storage tank (2) are subjected to coagulation multiphase treatment in the mixer 13). .

The flocculated liquid to be treated is supplied to the belt press type dehydrator (4), where the filtration water is treated in the vertical force dewatering section (5), and at the same time, the concentrated pressure dewatering zone (A) is a linear path, and the large diameter arc path is In the forced dehydration section (Illic), which consists of a collapse dehydration/-LBI and a shear dehydration zone (C) with a meandering path, the water is transferred from the gravity dehydration section (5) to the first child's cloth (7). The cake sent out is subjected to pressure dehydration treatment using a second rotating filter cloth (8).

After the dehydration process, the cake is passed through a filter cloth (
7) Peel and remove from (8).

The separated liquid and the filter cloths (7) and (8) after removing the cake are ejected from the nozzle (10) for purification and are collected in the cleaning drainage tank collecting drain (ul VC).

111 The separated liquid is temporarily retained in the retention tank (14) provided in series with the water drainage channel (11), and the ionicity of the retained separated liquid is measured at set time intervals by a measuring device n. The measured ionicity is input to the discrimination mechanism (I41,
Based on the discrimination results of the songwriting discrimination mechanism, the above-mentioned
For supplying flocculant from the storage tank (2) to the mixer (3), the discharge container if father-type bong (10 fully automatic Vc operation is used to supply just the right amount of flocculant.

That is, it is determined whether the ionicity in the separated liquid is positive, negative, or zero (hereinafter referred to as the neutralized state). If the measured ionicity is positive, the amount of flocculant added is decreased by the set amount, and if the measured ionicity is negative, the amount of flocculant added is increased by the set amount. This is Zazeru (7), which maintains the entire state of the box. Therefore, regardless of the properties of the liquid to be treated, the measured ionicity alternates between positive and negative water, a state close to a neutralized state, or a stable state in a neutralized state where it shows zero, and the flocculant They adjust the amount added to the minimum necessary amount on their own.

As the electrolyte flocculant, various kinds of coagulants such as slag, polyacrylate, polyacrylic acid ester, cationic flocculants for organic substances, anionic coagulants for inorganic substances, etc. are used.

According to the present invention, 1iTI belt press type dehydrator 14
Instead of iVC, various solid-liquid separation treatment means such as a coagulation sedimentation tank or a centrifugal concentrator can be used.

In the solid-liquid separation force method described above, in the present invention, the ionicity of the separated liquid is measured, and the ionicity of the gold is neutralized or aggregated so that it is in a state close to A. The feature is that the amount of the agent added is adjusted.

Based on the ionicity of the separated liquid as a result of flocculation treatment, the amount added is excessive as the measured ionicity is the same compared to the ionicity of the electrolyte flocculant.4! If the opposite is true, it is determined that the amount added is insufficient, and if it is in a neutralized state, it is determined that the amount is appropriate, so whether the flocculation process is being performed with the appropriate amount of flocculant. It is possible to determine the appropriate amount of coagulant and adjust the amount of coagulant added according to the determination result, so the amount of coagulant added can be adjusted with high precision according to the properties of the liquid to be treated. .

[Brief explanation of drawings]

Claims (1)

[Claims] A solid-liquid separation method in which the liquid to be treated Vc1 is subjected to a coagulation-mixing treatment by adding a solute flocculant, and then subjected to solid-liquid separation treatment, in which the total ionicity of the separated liquid is measured, and the measured ionicity is neutralized or A solid-liquid separation method characterized in that the amount of Vc flocculant added is adjusted according to the situation.