JPS60193508A - Solid-liquid separator - Google Patents

Abstract

PURPOSE:To obtain a solid-liquid separator which has a small floor are and long duration time of filtration even if the turbid matter concn. of water to be treated is high by dividing the separator to a filter zone and a settling zone and using a floating packing material having the specific gravity smaller than 1 for a filter medium. CONSTITUTION:Water to be treated contg. turbid matter supplied to a solid- liquid separator 1 through a supply pipe 7 for the water to be treated. The turbid matter which settles fast is first settled and removed in the settling zone and is then passed in upward current through a floating filter medium layer 3 by which the turbid matter is removed. The treated water is discharged to the outside of the column through a discharge pipe 4 for the treated water. A washing stage is executed by introducing washing water through a supply pipe 5 for the washing water into the separator, oscillating and agitating the floating filter media to strip the captured turbid matter from the filter media, entraining the same into the washing water passing through the media in downward current and discharging the same together with the turbid matter settled in the settling zone to the outside of the separator through a discharge pipe 6 for the washing water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a solid-liquid separation device, and particularly to a filtration device provided with a sedimentation separation zone.

[Prior art]

As a device for removing suspended matter from wastewater, sedimentation separation equipment is generally used when the concentration of suspended matter is high.

When the concentration of suspended solids is low, a filtration device having a layer of granular raw material is used.

The sedimentation area of the sedimentation separator is determined by the sedimentation velocity (Ut) of the suspended particles.

A=Q/Ut However, Q=Amount of water to be treated However, the sedimentation speed of suspended solids is distributed from high to low, and in order to increase the sedimentation separation efficiency.

Since it is designed with a small sedimentation rate, it becomes over-equipped for suspended particles with a high sedimentation rate, and the disadvantage is that the site area is large.

On the other hand, as mentioned above, the offshore filter device is used when the concentration of suspended solids is low, and its upper limit is generally 50 mg/t. The reason for this is thought to be that the suspended solids in the furnace material layer are mainly trapped by the action of the sieves between the suspended solids and the furnace material or between the suspended solids.

Since these are all carried out in the voids within the furnace material layer, it can be seen that the amount of suspended solids captured by the filtration device has a large effect on the porosity of the furnace material layer. Assuming that the time required to reach the limit value of the amount of suspended solids captured at 1 is the filtration duration (), we will first calculate θ = ηε・ε−r・H/ (Ci − Co)
・U−−・(2) Here, ηε: Void utilization rate (→ ε: Porosity (→ γ; Brushing density of trapped turbidity (r/m3) H; Layer height (→ Ci, Co: Turbidity concentration of treated water and treated water (m9/l
) U ; filtration rate Cm/n). Now, when sand or anthracite is used as a conventional granular raw material, its porosity is 0.5 (50%), and ηε=0.5. C1=500my7t, γ
"2X104y/m3, H"=2m, Co:
501ng/, 1. As U=8 m/h, (
2) Substitute into the formula.

When calculated, the filtration duration is about 3 hours, which is 9 hours in practical terms.
I understand that this is a problem.

[Purpose of the invention]

The purpose of the present invention is to eliminate the drawbacks of the prior art, and to achieve a small site area even if the turbidity concentration of the water to be treated is high, and
To provide a solid-liquid separator with a long filtration duration.

[Key points of the invention]

The present invention consists of 1. The turbidity that is easy to settle is pre-sedimented, and the turbidity that is difficult to separate by sedimentation is filtered through the ocean, so the inside of the device is divided into an offshore zone and a sedimentation zone, and the furnace material used in the filtration zone has a high porosity. The floating particles are higher than conventional ones and have a true specific gravity smaller than l, and the turbidity deposited in the settling zone is removed by washing water that is passed through the filtration zone in a downward flow through the settling zone at the same time. Alternatively, configure the device so that it is discharged from the bottom of the device.

[Embodiments of the invention]

FIG. 1 shows this embodiment.

Inside the solid-liquid separator l, there is a flotation furnace material layer 3 under the wire mesh 2.
is formed. At the top of the device, there is a treated water discharge pipe 4. A wash water supply pipe 5 is provided, and a wash water discharge pipe 6 is provided at the bottom of the device. Further, a water supply pipe 7 to be treated was provided in the middle of the apparatus below the flotation furnace material layer 3.

Next, the present invention will be explained in detail. First, in the treatment process, water to be treated containing turbidity is supplied to the solid-liquid separator 1 from the water supply pipe 7 to the solid-liquid separator 1.
The suspended solids with a high sedimentation rate are first sedimented and removed in the settling zone, and then the suspended solids are removed by passing through the floating material layer 3 in an upward flow. Expelled outside.

Generally, the treatment process ends when the turbidity concentration of the treated water reaches an allowable value, and the next cleaning process begins.

In the cleaning process, cleaning water is introduced into the apparatus through the cleaning water supply pipe 5, and the flotation furnace material is photographed and stirred.

At the same time, the captured suspended solids are separated from the furnace material and enter the sedimentation zone along with the washing water passing through in a downward flow.

The precipitated suspended solids are discharged from the washing water discharge pipe 6 to the outside of the apparatus. The features of this cleaning method are:

The flow direction of the washing water is a downward flow, which is the same direction as the sedimentation direction of suspended matter, and the amount of washing water used is smaller than that of conventional washing using an upward flow. Also, in the case of downward flow.

Because it is a floating furnace material, it can be effectively vibrated and stirred. In addition, the turbidity deposited in the sedimentation zone.

Since the water used to wash the furnace materials is discharged, new water for washing is not needed.

The filling material used in this example is shown in FIG. 2, and has a true specific gravity of 09. It has a porosity of 95% when filled, and is generally commercially available as a gas-liquid contact material.

Due to the difference in porosity, the amount of suspended solids trapped in the ν material layer in this embodiment is approximately 1.9 times that of the conventional material (porosity 50%). First, since suspended matter with a high sedimentation rate is primarily removed in the sedimentation zone, the filtration duration can be further increased. In this example.

Turbidity concentration of treated water 500-7t, upward flow rate 1077
Under the conditions of 1\j, the concentration of suspended solids in the treated water was less than 20 /l, and the filtration duration was about 10 hours, which was about three times as long as with the conventional filter layer. or.

The area of the solid-liquid separator can be reduced to less than 1/10 of that of a conventional sedimentation separator.

[Modifications and application examples of the invention]

In this example, the material shown in FIG. 2 that has a high porosity and floats is used, but is not particularly limited.9 For example, a ribbon-shaped material shown in FIG. 3 is used.

Alternatively, there is a mesh cylindrical eyewear shown in FIG.

〔Effect of the invention〕

According to the present invention, even if the turbidity concentration of the water to be treated is high.

The site area of the device can be reduced and the processing time can be lengthened.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a solid-liquid separator according to the present invention. FIG. 2, FIG. 3, and FIG. 4 show examples of floating F material. l... Solid-liquid separator 2... Wire mesh 3... Floating offshore material layer 4... Treated water discharge pipe 5... Washing water supply pipe 6
...Washing water discharge pipe 7...Water to be treated supply pipe. Figure 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1. A solid-liquid separator having a door material layer made of a filling material, characterized in that a filling material having a true specific gravity of less than 1 and floating in water is used as the F material. 2. A solid-liquid separator according to claim 1, characterized in that the porosity of the packing is 85 to 95%. 5 In claim 1, a settling zone is provided below the filtration zone having the P material layer, a treated water supply pipe and a washing waste water discharge pipe are provided below the filtration zone, and a treated water discharge pipe and a washing water discharge pipe are provided above the filtration zone. A solid-liquid separator characterized by having a supply pipe. 4. The solid-liquid separator according to claim 1, characterized in that the washing discharge pipe is provided below the settling zone.