JP6363472B2 - Wastewater treatment equipment with biological support - Google Patents

Description

  The present invention relates to a wastewater treatment apparatus provided with a microorganism adhesion carrier for supporting microorganisms for biologically treating organic wastewater or the like.

  Traditionally, microbial treatment has been effective for the treatment of organic wastewater such as household wastewater and factory wastewater, and in large-scale treatment plants such as sewage treatment plants, the activity of decomposing organic substances mainly by microorganisms suspended in water Sludge treatment is used. In addition, biological treatment that attaches microorganisms to gravel, fabric, string, and support carriers of various shapes is performed mainly for small-scale wastewater treatment because it is resistant to fluctuations in drainage load and the amount of excess sludge generated is small. .

  Such biological treatment involves attaching microorganisms to a support carrier and bringing waste water into contact with it to decompose organic matter. There are known processing tanks that use fiber woven fabrics or nonwoven fabrics installed in biological treatment tanks as biological treatment materials, and are supported and fixed in the tank with a support rod such as stainless steel, or fixed with a frame (Patent Literature). 1, 2, 3).

JP 2013-59734 A JP 2002-355688 A U.S. Pat. No. 7,731,852

  When using an oscillating carrier for supporting microorganisms, such as textile fabrics, non-woven fabrics, and string-like members, the support carrier absorbs water in the biological treatment tank and becomes a heavy material to which microorganisms and the like are attached, so it is supported to support the carrier. The member needs strength. Further, since it is necessary to prevent rust corrosion in water, stainless steel support rods and support frames are generally used.

In order to maintain the biofilm uniformly on the rocking carrier, it is necessary to fix the biofilm to the frame which is a support member at regular intervals using appropriate tension.
When the tension of the oscillating carrier is insufficient and the interval between the oscillating carriers cannot be kept constant, the biofilms formed on the surface of the carrier adhere to each other, and the biofilm grows in a form that increases the thickness. May fall off without being able to withstand. For this reason, it is necessary to mount the swing carrier while maintaining the strength of the frame. In order to fix a swinging carrier such as a textile fabric to the frame, it is necessary to fix a plurality of locations with stainless steel wires, etc. For that purpose, it is necessary to make holes in the corresponding locations of the frame, which is the fixing part, and processing Expenses are expensive. The mounting and exchanging work of the swinging carrier becomes complicated, and a simpler carrier fixing method is required.

  As means for solving such a problem, the inventor of the present application has a curtain rail-like member as a method of attaching a swingable carrier having excellent strength, durability, handling property, and workability to the frame as well as strength and durability. The following wastewater treatment equipment was found.

1. In a wastewater treatment tank comprising a oscillating carrier for holding a living organism on the surface thereof, and a frame for supporting the oscillating carrier so as to oscillate in the wastewater, the frame has a U-shaped cross section. This is a rail structure in which the upper and lower ends of a long material are bent inward to form a groove structure, and a frame is formed in parallel so that the openings of the groove structure face each other, and slidably engaged with the groove A wastewater treatment apparatus comprising: a slider for supporting the oscillating carrier at least at four corners of the oscillating carrier; and the oscillating carrier attached to the frame by engaging the slider with a groove of the rail structure.
2. 2. The waste water treatment apparatus according to 1 above, wherein the holding body of the slider is a substantially rectangular body, and a long diameter of the holding body is a length of an installation interval of the oscillating carrier.

The present invention is a wastewater treatment apparatus including a treatment unit that is loaded into a wastewater treatment tank and that supports a swinging carrier for holding a living organism on the surface thereof. The conventional stainless steel frame member has a wire or the like. By fixing the carrier, it is possible to provide a device that can be easily mounted and replaced while maintaining the same performance such as strength, durability, and corrosion resistance.
A wastewater treatment tank that can fix the carrier at regular intervals while maintaining the tension of the carrier by sequentially inserting the slider attached to the oscillating carrier into the so-called curtain rail attached in parallel to the frame Maintenance efficiency is also improved, such as easy installation of processing units and replacement of carriers.

The schematic diagram of the processing unit which attached the rocking | fluctuation support | carrier. Oscillating carrier made of chemical fiber fabric. The schematic diagram which shows the connection of a rocking support | carrier and a flame | frame. The schematic diagram of the waste water treatment equipment which loaded the processing unit which attached the rocking | fluctuation support | carrier to the waste water treatment tank.

The example of the embodiment of the waste water treatment equipment of the present invention is described using a drawing.
FIG. 1 is a schematic view of a wastewater treatment apparatus of the present invention. Sewage is decomposed and digested with microorganisms in a multi-stage biological treatment tank 1 having two or more biological treatment tanks to minimize the amount of sludge generated.
Wastewater that can be applied to this device is wastewater that contains organic matter that can be decomposed by living organisms, and is diverse, including domestic wastewater, food factory wastewater, chemical factory wastewater, and pharmaceutical factory wastewater. In addition, even wastewater containing toxic substances with respect to microorganisms or the like that digest organic substances can be treated by removing the toxic substances in advance by pretreatment.

  After removing solids contained in the raw water of organic wastewater such as domestic wastewater and factory wastewater to be treated with a screen, temporarily store it in the raw water adjustment tank and add a neutralizer to reduce the hydrogen ion concentration in the wastewater. After adjusting to a neutral range of about PH 6-8, it is introduced into the biological treatment tank 1. When a large amount of solid matter is contained in the waste water, it is common to perform pretreatment by a separation device applying physical and chemical principles such as a pressurized flotation device and remove the solid matter in advance.

Such a biological treatment tank 1 includes a diffuser pipe 3 and an air pipe for air supply inside, and has a structure capable of sending air into the biological tank. The air diffuser 3 is intended to supply oxygen to aerobic microorganisms, and it is required to increase the dissolution rate in water as much as possible, but at the same time, the surface of the air diffuser is not blocked by the propagation of microorganisms. Consideration is also an important requirement. The diffuser tube of the type different types such Sokichi trachea which gives priority resistance obstructive by fine diffusing tube and microbes which gives priority oxygen dissolved efficiency can be used.

  The biological treatment tank 1 composed of two or more tanks is a contact oxidation tank using a fixed carrier. Such a biological treatment tank includes a space partitioned by partition walls made of concrete, plastic, metal, or the like, and is configured in two or three tanks by putting the partition walls in one tank. The flow of drainage from the tank to the tank is always unidirectional and flows by overflowing the upper side of the partition wall or communicating between the tanks on the lower side of the partition wall. Specifically, MSABP (registered trademark), which is a multi-stage biological treatment tank of Aquarias, can be used.

Since the biological tank using the biological carrier 2 is fixed in the tank without flowing out of the tank because bacteria adhere to the surface of the carrier, the sludge age becomes high. By increasing the age of sludge, there is a merit that the ability to decompose into persistent organic substances increases. In addition, the microbial membrane formed on the surface of the carrier is composed of aerobic bacteria, but the back side of the microbial membrane has a low oxygen concentration, so facultative anaerobes have settled. Will progress. It is thought that facultative anaerobes and aerobic bacteria prey on each other. As a result, the merit that sludge is reduced in the microbial membrane is expressed.

By configuring the biological treatment tank 1 in multiple stages of two or more tanks, the priority species of the organism change from bacteria to progeny and metazoans from the front to the rear, and the organic matter in the wastewater by various microorganisms Disassembled and purified. By configuring the food chain, surplus sludge is efficiently self-digested and sludge volume reduction can be achieved.
In the case of a multistage biological treatment apparatus (MSABP: registered trademark), the aeration tank including the diffuser tube 3 and the biological carrier 2 is multistaged to 4 to 16 stages (usually 8 to 12 stages) so that the inside of the biological treatment tank The food chain can be reproduced and the biological treatment can be carried out efficiently.

  The frame 10 for fixing and supporting the oscillating carrier 4 used as a biological carrier in the present invention in drainage is formed as a rectangular frame using a frame made of metal such as stainless steel or resin as shown in FIG. To do. Such a frame 10 is required to have strength and corrosion resistance sufficient to fix and maintain the oscillating carrier 4 having a biofilm formed in the waste water. In addition, a frame integrally formed as a grid-like square frame such as a resin panel or FRP grating may be used.

  As the oscillating carrier 4 used in the present invention, a fiber fabric or the like can be used. Specifically, fibers that make up a biodegradable phase that decomposes organic matter in wastewater by supporting microorganisms on the fiber surface, such as using MSABP (registered trademark), a multistage biological treatment tank of Aquarius Technologies Inc. A woven fabric, a nonwoven fabric, a fiber bundle, or the like can be used.

As shown in FIG. 2, a plurality of such oscillating carriers 4 are fixed to the frame frame at predetermined intervals to constitute a carrier unit, which is installed in each stage in the biological treatment tank.
In the past, the swingable carrier 4 and the stainless steel frame were fixed using a stainless steel wire or a binding band having strength and corrosion resistance. Even if the biofilm grows in the wastewater, it is necessary to fix the film while maintaining a certain tension. For this purpose, complicated operations such as drilling and fixing the fixing part to the frame are required.

  In the present invention, curtain rails 11, 12, 13, 14, 15, 16 are provided at both ends of the frame, and sliders 17 are provided at both ends of the oscillating carrier 4 so as to be reciprocally movable in the curtain rails. The oscillating carrier 4 can be fixed to the frame by being inserted into the rail.

  The frame constituting the curtain rails 11 to 16 is a rail structure in which a groove structure is formed by bending the upper and lower ends of a long material having a U-shaped cross section inward, and the openings of the groove structure face each other in parallel. (11-12, 13-14, 15-16). In addition, sliders 17 that are slidably engaged with the grooves are provided at the four corners and the central end of the oscillating carrier 4, and the oscillating carrier is attached to the frame by engaging the sliders with the grooves of the rail structure. Install. As a result, the oscillating carrier can be fixed to the frame with a constant tension.

As shown in FIG. 4, the slider 17 has a substantially parallelepiped shape and includes a hanger portion 18 for attachment to the carrier. The hanger portion 18 and the carrier may be fixed with a high-strength fiber, stainless steel wire or the like, or hooked with a hook.
By making the length of the slider 17 in the sliding direction the length of the fixed interval between the carriers, the oscillating carrier can be installed and fixed at equal intervals by pushing the slider 17 into the curtain rails 11-16.

Claims (1)

In the wastewater treatment tank, the waste water treatment apparatus having a plurality of swing carrier, a plurality of frames you swingably supported in draining swing carrier for holding a biological on its surface, The frame is a rail structure in which the upper and lower ends of a long material having a U-shaped cross section are bent inward to form a groove structure, and the frame is formed in parallel so that the openings of the groove structure face each other. The slider is slidably engaged with the four corners of the oscillating carrier, and the slider has a substantially parallelepiped shape with a hanger part for attaching the oscillating carrier, and the groove of the rail structure. the Rutotomoni mounting the oscillating carrier to the frame by engaging the slider, that the length of installation interval when plural supporting the sliding direction of the length of the parallelepiped shaped frame swing carrier Features and That waste water treatment equipment.