JPH0316687A - High-speed waste water treating device - Google Patents

Abstract

PURPOSE:To stably execute solid-liquid flotation separation by providing a rapid treating machine which adds a flocculating agent to the desorption liquid of a separating chamber and stirs the liquid and a floating tank which stabilizes the waste water from this rapid treating machine. CONSTITUTION:The floatable material and settlable materials in the waste water are subjected to the solid-liquid sepn. in the separating tank 1. The polymer flocculating agent 4 is added by the rapid treating machines 5 to this desorption liquid to form flocculated lumps. The liquid is stirred at a high speed and air is mixed therewith to adsorb the unstable flocculated lumps on the bubble surfaces. The bubbles are released into the floating tank 10. The bubbles are rapidly expanded and are floated together with the flocculated lumps adsorbed on the bubble surfaces in the floating tank 10. After the floated materials are treated with a chemical, the materials are reduced in weight by a dehydrating machine and are incinerated. The treated liquid is discharged from a discharge pipe 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-speed wastewater treatment F■ system for domestic wastewater, gray water, industrial wastewater, etc., and is particularly concerned with small-sized treatment equipment and pre-treatment in industrial wastewater treatment. It can be effectively used as a device.

[Conventional technology] Domestic wastewater and gray water discharged from general houses, apartment complexes, high-rise buildings, etc., as well as commercial wastewater from catering industries, restaurants, food factories, etc., contain organic and inorganic substances. In addition, industrial wastewater includes special wastewater and high-concentration wastewater that contain pollutants.

It is known that if such wastewater is released directly into nature, it cannot be decomposed into slag by natural purification alone, and the weight and concentration exceeds the natural cycle, causing no adverse effects. 8 types of wastewater treatment methods have been developed to prevent this and purify the environment.

Broadly speaking, these sewage treatment methods can be divided into physical treatment methods and biological treatment methods, and 114 methods are small, high-speed, and highly effective skewers, but they are M1 elegant and have high initial costs and running costs. Due to its nature, there are many surplus products, which is one of the causes of high running costs.

On the other hand, biological treatment methods have a slightly longer residence time, require a larger installation area, and are more expensive. However, with activated sludge method,
Although there are problems with instability due to harmful substances and increased m of surplus products, the current standard separation contact aeration type requires maintenance and inspection f
1 mi, economical, stable rainbow (f effect and common).

Further, a pressurized flotation method is known as an example of factory wastewater treatment. This system is composed of a regulating slide, a pressurized tank, and a flotation device, and has attached equipment such as a compressor and a reactant injection device, which produce a flotation separation effect through a series of processing steps. The floating material is then treated with chemicals to reduce its weight in a dehydrator, and then disposed of by incineration, slicing, etc.

[Problems to be Solved by the Present Invention] As described above, general wastewater treatment equipment has a multi-tank structure and various types of structures, is complex, requires a large installation space, and requires maintenance by specialized engineers. There are problems such as increased equipment costs, processing costs, and maintenance costs, and an increase in surplus products due to the use of chemicals for defeated species.

[Means for Solving the Problems] The present invention pre-treats floating substances and settling substances in wastewater using a separation basin that floats and settles them, and adds a flocculant to the separated liquid from the fl& tank. It is equipped with a rapid treatment machine that mixes air after stirring, and consists of a flotation tank that stabilizes the waste water from the rapid treatment machine. A pump that suctions and stirs with an invera, and H! The pump is equipped with an ejector that mixes outside air at the pump discharge port.

[Sakukawa] Therefore, floating substances and settling substances in wastewater are separated into solid and liquid in a separation tank, and the separated liquid is mixed with polymer flocculation and air is mixed with it to form unstable flocs. is adsorbed onto the surface of the bubbles and released into the flotation tank, whereupon the bubbles expand and separate by flotation.

[Example] This will be explained with reference to an embodiment shown in the drawings.

1 is a separation tank, 2 is a discharge pipe for taking out the desorbed liquid from the separation tank,
3 (a flocculating tank in which a flocculant 4 is added to the removed separated liquid; 5 is a rapid processing machine, which is composed of a pump 6 and an ejector 7; 8 is installed at the discharge port of the pump G in the ejector 7); 9 is an air suction pipe, 10 is a flotation tank, and It is a drain port.

The waste water that has flowed into the separation tank 1 causes floating substances and sedimentation substances to float and settle, and the desorbed liquid is sent from the discharge pipe 2 to the flocculation tank 3.

In this flocculation tank, a polymer flocculant 4 with a concentration of 0.1% is added to the desorbed liquid.
is added at an injection rate of 1%, sucked in by the pump 6 of the rapid treatment machine 5, rapidly mixed and stirred by the rotation of the inflator to sufficiently dissolve the desorbed liquid and the flocculant, and then blown out from the nozzle 8 in the form of a jet water stream. let A decompression phenomenon occurs in the ejector 7 of the solution C blown out from the nozzle 8 (Penchery effect)
As a result, the outside air from the air suction pipe 9 comes into contact with the solution at high speed and high pressure, and unstable aggregates in the solution are instantaneously absorbed by the surface of the outside air bubbles and released into the flotation tank 10.

Since the bubble aggregates released under pressure are pressurized in the pump, they become relatively depressurized in the flotation tank, and the bubble volume expands rapidly, increasing buoyancy and causing the bubbles to absorb and absorb young aggregates on the surface of the bubbles. surface with.

The floating substances are treated with chemicals to reduce their weight in a dehydrator, and then are treated by incineration or taming, and the treated liquid is discharged from the discharge port 12.

The flocculation tank 3 and the rapid treatment device 5 may be installed outside the flotation tank, but if they are installed inside the flotation tank 10 as shown in the figure, the space around them can be further reduced. In addition, by selectively using a flocculant (according to the condition of the drainage), it is possible to use a flocculant (F1) for each drainage scale.

[Effects of the present invention] As described above, the present invention provides floating rl in wastewater as nQ treatment.
Sediment i substance and sedimentable substance respectively on the ocean.
A rapid processing machine equipped with a 1 slide, which adds a flocculant to the liquid removed from the 1 II slide, stirs it, and mixes air, adsorbs unstable agglomerates onto the bubble surface and blows them out into the flotation tank. As a result, a series of processes consisting of mixing, stirring, pressurized tank, and flotation in the conventional pressurized flotation system can be performed in a short time using a rapid processing machine using a pump and ejector. Solid-liquid flotation separation has become T!, which has the effect of reducing equipment costs and treatment costs, and can be effectively applied even if sewer discharge standards are strengthened. This has the advantage that it can be transported directly to the dehydrator without chemical treatment.

In addition, for wastewater that can be treated biologically, we use a flocculant that has a low impact on the physiological effects of activated sludge after a simple sedimentation tank. By installing the machine as an I1 processing device, 110+) load, Norheki E'J? :I (especially restaurant wastewater) can be reduced, a high-quality drainage effect is possible, and physical treatment is achieved by reducing the floating products of the pre-treatment equipment and surplus sludge of the sewage treatment equipment together in the nitrification storage tank. It is possible to obtain a wastewater treatment system that has the advantages of both conventional and biological treatment methods.

[Brief explanation of the drawing]

Figure (1) is a side sectional view showing the configuration of an embodiment of the present invention. 1 is a separation slide, 2 is a discharge pipe, 3 is a coagulation tank, 5 is a rapid treatment machine, 6 is a pump, 7 is an ejector, 8 is a nozzle, 9 is the air intake pipe, 10 is the flotation tank, and the mouth.

Claims (1)

[Scope of Claims] 1. A separation tank that floats and settles floating substances and settling substances in wastewater, and a rapid treatment machine that adds a flocculant to the separated liquid in the separation tank, stirs it, and mixes air. , a high-speed wastewater treatment device characterized by being equipped with a flotation tank that stabilizes the wastewater from the rapid treatment device. 2. The rapid treatment device according to claim 1, wherein the rapid treatment device is comprised of a pump that adds a flocculant to the desorbed liquid from the separation tank and absorbs water, and an ejector that is installed at the pump discharge port and mixes outside air. High-speed wastewater treatment equipment.