JP2001224907A - Advanced treatment-correspondent flocculating, settling and rapid filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an advanced treatment-correspondent flocculating, settling and rapid filtering device miniaturized, inexpensive in equipment cost and operation cost and capable of carrying out stably advanced treatment of sewage, wastewater from a factory or the like and water purification of lakes and rivers with high efficiency. SOLUTION: The usual flocculating tank and the usual settling tank are combined into one, which is then partitioned into a flocculating chamber 1, a settling chamber 2 on the lateral side of the chamber 1 and a storage chamber 3 below the chamber 1. A slot part 5 communicating with the chamber 2 is provided in the lower part of the side surface of the camber 1. A partition plate 6 having communication holes 7 communicating with the chamber 3 is provided on the bottom surface of the chamber 1. A flow rectifying plate 8 projecting toward the chamber 2 is provided for rectifying the current flowing to the chamber 2. Any of a sand filtration chamber, a membrane filtration chamber, a biological membrane filtration chamber and an activated carbon adsorption filtration chamber is provided in the upper part of the chamber 2 for filtrating supernatant water of an upward current.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for treating suspended substances, soluble organic substances, nutrients, metals and the like contained in sewage. In particular, equipment and operation costs are low, sewage,
The present invention relates to a compact, high-processing coagulation sedimentation / rapid filtration system capable of performing high-level treatment of factory wastewater and the like and purification of lakes and rivers with stable and high efficiency.

[0002]

2. Description of the Related Art In order to perform advanced treatment of sewage and industrial wastewater and purification of lakes / marshes / rivers by a coagulation sedimentation / rapid filtration method, a facility as shown in the processing flow of FIG. Becomes In such a facility, since each processing tank is separately installed, there is a problem that a large installation area is required, operation management is complicated, and initial running costs are high.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the following:
Low cost coagulation sedimentation and rapid processing with high efficiency and low cost of equipment and operation, stable and high efficiency of advanced treatment of sewage and industrial wastewater and purification of lakes / marshes / rivers. Providing filtration equipment.

[0004]

Means for Solving the Problems As means for achieving the above object, the inventions according to claims 1, 2 and 3 are used.

That is, a conventional coagulation tank and a sedimentation tank are combined, a side of the coagulation chamber is defined as a sedimentation chamber, and a lower part is defined as a storage chamber, and a slot communicating with the sedimentation chamber is provided below a side surface of the coagulation chamber. A coagulation sedimentation apparatus comprising: a partition plate having a communication port communicating with the storage chamber on the bottom surface of the coagulation chamber; and a rectifying plate protruding toward the sedimentation chamber.

The coagulation chamber of the coagulation settling apparatus according to claim 1 is divided into upper and lower sections, the upper section is a rapid stirring and coagulation chamber, the lower section is a slow stirring and coagulation chamber, and the boundary between the upper and lower sections is a partition plate having a communication port. A coagulation sedimentation apparatus characterized by the above-mentioned.

[0007] Any one of a sand filtration chamber, a membrane filtration chamber, a biological filtration chamber, and an activated carbon adsorption filtration chamber for filtering the supernatant water of the sedimentation chamber by an upward flow above the sedimentation chamber of the coagulation sedimentation apparatus according to claim 1. A coagulation sedimentation / rapid filtration device characterized by having a filter.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic longitudinal sectional view of a coagulation sedimentation / rapid filtration device capable of advanced treatment. As shown in FIG. 1, the apparatus includes a flocculation chamber 1, a sedimentation chamber 2, a storage chamber 3, and a filtration chamber 4. The bottom surface of the coagulation chamber 1 is a partition plate 6 having a communication port 7, which separates the coagulation chamber 1 from the storage chamber 3. The end of the partition plate 6 is connected to a straightening plate 8 protruding in the direction of the sedimentation chamber 2. The upper stage rapid stirring / aggregating chamber 9 and the lower stage slow stirring / aggregating chamber 10 are separated by a partition plate 11 having a communication port 12. Above the sedimentation chamber 2, a filtration chamber 4 for filtering the supernatant water by an upward flow is provided.

Next, the operation of the present invention will be described along with the processing procedure.

A certain amount of sewage 14 intermittently flows into the rapid stirring / coagulation chamber 9. In the rapid stirring coagulation chamber 9, a stirring flow is generated by the stirrer 13, mixed with the coagulant 15 injected quantitatively, and flocs are formed by the coagulation reaction. Along with the above, the liquid mixture in the rapid stirring and aggregation chamber 9 is transferred from the communication port 12 of the partition plate 11 to the slow stirring and aggregation chamber 10,
The mixture is gently agitated by the agitation flow generated through the communication port 12, and the floc grows. The sludge whose floc has grown and becomes heavier in the slow stirring flocculation chamber 10 is stored in the storage chamber 3 through the communication port 7 on the bottom surface of the flocculation chamber 1.
Settles down. On the other hand, the liquid mixture in the slow stirring and aggregation chamber 10 is transferred to the sedimentation chamber 2 through the lower slot 5 as described above. When the inflow is stopped, the sludge in the mixed solution transferred to the sedimentation chamber 2 is settled by gravity, and the sludge settles into the storage chamber 3 along the sloping wall 16 by the rectifying plate 8 and the bottom of the flocculation chamber 1. It is classified into sludge returned. The quantitative ratio of the returned sludge at this time is adjusted by the angle θ of the current plate 8. The sludge returned to the bottom of the coagulation chamber 1 is sieved into the sludge settling into the storage chamber 3 through the communication port 7 and the sludge remaining in the coagulation chamber 1. The quantitative ratio of the sludge settling in the storage chamber 3 at this time depends on the opening ratio of the communication port 7. Part of the sludge remaining in the flocculation chamber 1 is wound up by the stirring flow of the flocculation chamber 1 and floats in the flocculation chamber 1. The amount of the sludge that is rolled up and floated depends on the amount of sludge returned to the coagulation chamber 1 and remaining and the strength of the stirring flow. On the other hand, along with the above, the supernatant water in the upper part of the sedimentation chamber 2 is pushed up and flows upward to the filtration chamber 4. {Circle around (10)} In the filtration chamber 4, after filtration, adsorption, biological treatment, and the like are performed depending on the type of the filtration layer, the water overflows with natural water.
More outflow.

[0011]

It has been known that the effect of flocculation and sedimentation is higher when the mixed solution contains a certain amount of SS, which is a nucleus for floc formation. As described above, the coagulation sedimentation device of the present invention can return a certain amount of sludge to the mixed solution without using a pump by natural water flow and gravity sedimentation. It is wound up by the agitated flow and floats at a constant concentration in the mixed solution, forming a core of floc formation. As a result, there are advantages that the effect of coagulation and sedimentation is high, the removal rate of polluting components and SS content is high, the amount of coagulant used can be reduced, and the amount of generated sludge is correspondingly small.

In addition, the coagulant concentration in the mixed liquid is reduced by ingesting the coagulant from the mixed liquid and releasing the coagulant into the mixed liquid of the sediment sludge on the bottom surface of the coagulation chamber and the sludge in the storage chamber. It has the effect of stabilizing and suppressing wasteful use of the flocculant.

Further, the coagulation sedimentation / rapid filtration device of the present invention can perform an upward flow filtration treatment above the sedimentation chamber after the coagulation sedimentation treatment, so that the filtration can be performed uniformly by the upward flow. (Equivalent load of pollutants), flocculation and sedimentation in the previous stage neutralizes the charge of suspended matter, has the effect of adsorption and removal, has high filtration efficiency, and scum generated in the storage chamber floats to the upper flocculation chamber. Therefore, flocculated floc adhering to the filter medium layer in the filtration chamber settles in the storage chamber due to gravity, so the filter medium layer is less clogged and can be used for a long period of time. When the flocculated floc adhering to the filter medium layer is desorbed by passing water (use of high-pressure water) and sedimented by gravity into the storage chamber, it can be effectively washed. Is from above the filtration layer The stream of wash water, to flow back to the previous stage of agglomeration chamber, it is efficient can flocculation process again produces the advantage.

Further, the coagulation sedimentation / rapid filtration apparatus of the present invention comprises a conventional rapid stirring coagulation tank, a slow stirring coagulation tank, a sedimentation tank,
Since the filtration tank and the storage tank are integrated, there are advantages in that the installation space is small, transfer equipment such as a transfer pump is not required, and operation management is easy.

[0015] As described above, the equipment cost and the operating cost are low, and the advanced treatment for downsizing, which can perform the advanced treatment of sewage and factory drainage and the purification of the water quality of lakes, rivers and rivers with high efficiency, is realized. It is possible to provide a coagulation sedimentation / rapid filtration device of a mold type.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a coagulation sedimentation / rapid filtration device capable of advanced treatment, showing an embodiment of the present invention.

FIG. 2 is a process flow of a coagulation sedimentation / rapid filtration facility showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coagulation room 2 ... Sedimentation room 3 ... Storage room 4 ... Filtration room 5 ... Slot part 6 ... Partition plate 7 ... Communication port 8 ... Rectification plate 9. ··· Fast stirring flocculation chamber 10 ··· Slow stirring flocculation chamber 11 ··· Partition plate 12 ··· Communication port 13 ··· Stirrer 14 ··· Sewage 15 ··· Flocculant 16 ··· Sloping wall ... Overflow cough

Claims (3)

[Claims] 1. A coagulation chamber is divided into a sedimentation chamber and a lower part thereof is defined as a storage chamber. A slot portion communicating with the sedimentation chamber is formed below a side surface of the coagulation chamber, and a bottom surface of the coagulation chamber is communicated with the storage chamber. A coagulating sedimentation apparatus comprising: a partition plate having a communication port; and a rectifying plate protruding toward the sedimentation chamber. 2. The coagulation chamber of the coagulation sedimentation apparatus according to claim 1, wherein the coagulation chamber is divided into upper and lower sections, the upper section is a rapid stirring coagulation chamber, the lower section is a slow stirring coagulation chamber, and a boundary between the upper and lower sections has a communication port. A coagulation sedimentation device characterized by using a partition plate. 3. A sand filtration chamber, a membrane filtration chamber, a biological filtration chamber, and an activated carbon adsorption filtration chamber for filtering the supernatant water of the sedimentation chamber by an upward flow above the sedimentation chamber of the coagulation sedimentation apparatus according to claim 1. A coagulation sedimentation / rapid filtration device characterized by any one of the above.