JPH0648801U - Settling tank for sewage purification - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to provide a settling tank for purifying sewage, which can prevent the settling flocs from flowing out together with the treated water, and can also downsize the settling tank. And [Constitution] The present invention is a settling tank for collecting sewage in a tank to precipitate filth and for purifying sewage by draining sewage water, with an interval above and below the surface of the sewage collected in the tank. The installed upper partition member and lower partition member having water permeability, the group of floc traps having a specific gravity of about 1 filled between the upper and lower partition members, and the group of floc traps collected and washed, and then the upper and lower partition members again. It is a settling tank for purifying sewage, characterized by comprising a circulation means to be put in between.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sewage purification settling tank.

[0002]

[Prior art]

 As a method of purifying sewage, there is a method of collecting sewage in a settling tank to precipitate filth, and removing eddy water for purification. The settling tank is for separating filth and separating it from the treated water. At this time, a method is used in which a flocculant is mixed into the tank to solidify the fine particles of the filth to form sedimentation flocs.

[0003]

[Problems to be solved by the device]

 As described above, the sedimentation flocs obtained by solidifying the waste fine particles by using the coagulant have a specific gravity only slightly higher than that of water, and thus the sedimentation speed is very slow. Therefore, the water flow in the tank may rise, and the water may flow out of the tank together with the lean water, so it is necessary to slow the water flow in the tank. However, in order to slow the water flow, it is necessary to reduce the inflow of sewage into the tank, which leads to a decline in the sewage treatment capacity. Therefore, in the past, the processing capacity was improved by enlarging the settling tank and increasing the inflow of wastewater. However, there are various problems such as difficulty in securing the site for constructing the treatment facility, high construction and treatment costs, and complicated maintenance, so miniaturization of the sedimentation tank is desired. Is the reality.

[0004]

[Means for Solving the Problems]

 The present invention has been made in order to solve the above-mentioned problems, and can prevent the settling flocks from flowing out together with the treated water, and can further reduce the size of the settling tank. The purpose is to provide a settling tank. That is, the present invention is a settling tank that collects wastewater in the tank to settle the waste, and drains the waste water to purify the wastewater. The upper partition member and the lower partition member having water permeability, the floc trapping body group having a specific gravity of about 1 filled between the upper and lower partitioning members, and the floc trapping body group are collected and washed, and then the upper and lower partitioning members are collected again. It is a settling tank for purifying sewage, which is characterized by comprising a circulation means to be put in between.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. <A> Settling tank body The settling tank body 1 of the present invention may be smaller than a conventional settling tank. A sewage inlet 11 is opened on the side surface, and a sediment recovery chamber 13 is provided on the bottom surface 12 on the opposite side of the sewage inlet 11. The bottom surface 12 may be gradually inclined downward from the sewage inlet 11 side toward the sediment recovery chamber 13 side. The lower part of the tank is used as a settling area 14 for separating filth and treated water, and the filth deposited here is collected in the sediment collection chamber 13 by rotating the Reiki 15 installed on the bottom surface 12 to rotate. Discharge outside the tank. On the other hand, the thin treated water 2 separated from the filth is drawn out of the tank from the treated water outlet 16 provided at the upper portion of the side surface or the like.

<B> Upper and Lower Partition Member For the upper partition member 4, for example, a water-permeable mesh plate or the like is used, and is installed in the upper layer of the tank and slightly below the treated water outlet 16 in a substantially horizontal direction. The upper partition member 4 holds the flock trap body 3 so that it does not float up to the vicinity of the surface of the treated water 2. The lower partition member 41 is installed in the middle part of the tank so as to be inclined in the horizontal direction or downward from the sewage inlet 11 side toward the sediment recovery chamber 13 side. The lower partition member 41 is composed of, for example, a group of stainless steel rods arranged at intervals as shown in FIG. Water permeability is ensured by the gap between the rod groups, and the size of the gap is such that the flock trapping body 3 does not drop.

<C> Filtration Layer The space between the upper and lower partition members 4 and 41 is defined as a moving area 42 of the floc catching body 3. Then, the moving area 42 is filled with 3 groups of floc trappers made of a filter material having a specific gravity of about 1 which floats in water, and a filtration layer is formed in the upper layer portion of the precipitation area 14. For the floc trapping body 3 used here, pellets made of resin such as polyethylene are used, and the tank is filled with an amount sufficient to obtain a required filtration capacity.

<D> Circulating Device The circulating device is composed of a screw conveyor 5 for collecting the flock capturing body 3, a circulating gutter 51, a screw conveyor 55 for charging, and the like. As shown in FIG. 2, a mortar-shaped flock recovery chamber 17 is provided on the downstream side of the lower partition member 41, and the lower end is positioned in the flock recovery chamber 17 to collect the flock trapping body 3. Set up 5. An upper end of a circulation gutter 51, which is inclined downward, communicates with the upper portion of the recovery screw conveyor 5. A shunt 52 is provided at the lower end of the circulation gutter 51, and a loading screw conveyor 55 is set up in the shunt 52, and the lower end is located in the moving area 42. The above-mentioned screw conveyors 5 and 55 are characterized in that they have a function of cleaning the floc trapping body 3 by stirring while transporting the floc trapping body 3 and generating static electricity. In this embodiment, a screw conveyor is used, but an air lift or other means may be used.

<E> Cleaning Device The cleaning device is composed of a shower 6 or the like provided on the way of the circulation gutter 51. Here, the water sprayed from the shower 6 washes away the dirt attached to the flock trap body 3, passes through the net body 61, and is discharged from the wash water recovery chamber 62 together with the wash water. Then, the cleaned and clean floc trap 3 is sent to the circulation gutter 51 again and returned to the tank.

[0010]

[Action]

 Next, a method for purifying sewage using the settling tank configured as described above will be described. The sewage flowing into the tank from the sewage inlet 11 is sent into the settling area 14, the sewage is settled in the settling area 14, and the sediment is collected by the reiki 15 and discharged from the settling collection chamber 13. At this time, the sedimentation floc solidified by the coagulant may float in the sedimentation area 14 and may be wound up by the flow of sewage and rise. However, on the upper part of the settling area 14, a filtration layer in which the floc trapping body 3 groups are densely arranged is provided. Therefore, since the settling flocs adhere to this filtration layer, only the clean treated water 2 can be passed through the upper partition member 4 and raised. On the other hand, the floc trapping body 3 to which the settling flocs adhere is collected from the collecting screw conveyor 5 by a fixed amount, washed, and then fed again into the moving area 42 by the feeding screw conveyor 55. . As described above, the flock trapping body 3 is transported by the screw conveyors 5 and 55 and is stirred and washed, and static electricity is imparted by friction. Therefore, when static electricity is generated in the floc trap 3, the precipitated flocs are more easily adsorbed to the floc trap 3 by the adsorption action of the electrostatic air. Therefore, the purification action is improved.

[0011]

[Effects of the Invention] Since the invention is as described above, the following effects can be obtained. <a> By forming a filtration layer with a group of floc trapping bodies above the sedimentation area of the waste in the sedimentation tank, even if the water flow in the tank is increased, the sedimentation flocs are captured by the filtration layer and cleaned. Only the pure water can be drawn out of the tank. Therefore, it is possible to reduce the size of the settling tank, and it is possible to solve the conventional problems in securing the site, construction and treatment costs, and maintenance.

<B> The floc trapping body can be easily washed by the circulation device and the washing device. Therefore, it is possible to always install a floc trap with high filtration ability in the tank.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention.

[Fig. 2] Illustration of the floc collection chamber

Claims (1)

[Scope of utility model registration request] 1. A settling tank for collecting sewage in a tank to precipitate filth, and purifying the waste water by purifying sewage, which is installed above and below the surface of the sewage collected in the tank. A water-permeable upper partition member and a lower partition member, a group of floc traps having a specific gravity of about 1 filled between the upper and lower partition members, and a group of floc traps collected and washed, and then again between the upper and lower partition members. A sedimentation tank for purifying sewage, which is characterized by comprising a circulating means for charging.