KR100552340B1 - Method and apparatus for treating organic sewage and wastewater - Google Patents

Abstract

The present invention relates to a method and apparatus for treating organic wastewater, wherein the wastewater is stored in a storage tank and then transferred to an agglomeration reaction tank and mixed with an inorganic coagulant aid and an organic polymer flocculant, dewatered and filtered in a dehydrator, and the separated sludge is incinerated or incinerated. After composting, the separated water is sent to the aeration tank for further treatment and transported to the sedimentation tank to separate the sludge and water, and the separated sludge is sent to the storage tank for further treatment, and the separated water is passed through a multi-stage rock wool biofilter plate assembly. After treatment, the wastewater is treated by discharging the wastewater into a drain installed with rock wool filters.

 Inorganic fiber, inorganic coagulant, wastewater treatment, rock wool carrier, rock wool filter

Description

 Method and apparatus for treating organic wastewater {Method and apparatus for treating organic sewage and wastewater}

1 is a process schematic diagram showing a method for dewatering sludge according to the prior art.

2 is a schematic view of an organic wastewater treatment apparatus according to the present invention.

Figures 3a and 3b is a state diagram of the installation of the fibrous rock wool carrier embedded in the aeration tank of the apparatus shown in Figure 2, Figure 3a is a plan view and Figure 3b is a side view.

4A and 4B are schematic views of a multistage rockwool biofilter plate assembly for use in the device according to the invention shown in FIG. 2, FIG. 4A is a plan view and FIG. 4B is a side view.

5 is an installation state diagram of a rock wool filter fixed in the drainage in the apparatus according to the invention shown in FIG.

Explanation of symbols for main parts of the drawings

A: reservoir B: flocculation reactor

C: Dehydrator D: Primary Aeration Tank

E: secondary aeration tank F: sedimentation tank

G: Multistage Rockwool Bio H: Drainage

    Filter plate assembly

10: rock wool carrier 14: filter plate

22: water plant 26: rock wool filter

The present invention relates to a method and apparatus for treating organic wastewater, and more particularly, to increase solid-liquid separation capacity and lower sludge water content by coagulation filtration of an organic wastewater slurry using inorganic fibers as an inorganic coagulant in treating organic wastewater. It reduces the concentration of wastewater, including suspended solids (SS), biological oxygen demand (BOD), total nitrogen (TN), and total phosphorus (TP) in the filtration wastewater (filtrate). The present invention relates to a method and apparatus for improving the quality of water by further treating wastewater by passing through planted rockwool filters.

In general, domestic wastewater, livestock wastewater, and industrial wastewater are the main causes of polluting rivers as they flow into rivers, and when such wastewater, livestock wastewater, and industrial wastewater flows into rivers, In addition, a number of microorganisms and organic matter (phosphorus, nitrogen, protein, etc.) are also introduced into the stream, and the organic matter is oxidized and decomposed by the plurality of microorganisms (aerobic bacteria), so that the microorganisms multiply and the amount of dissolved oxygen in the stream ( As the DO decreases, that is, the biological oxygen demand (BOD) increases significantly, the pollution of the river becomes very serious.

As such, when BOD increases, life such as fish cannot live in rivers, and odors are generated by organic matters in the rivers, thereby adversely affecting the environment.

There are various methods of treating wastewater, such as activated sludge method, watering method, aeration lagoon method, soil purification method, anaerobic treatment method, and advanced treatment method. It was happening.

To this end, conventionally, in the solid-liquid separation process in the wastewater sewage and livestock wastewater treatment process, organic polymer coagulant, ferrous chloride (FeCl ₃ ), slag powder, paper crushed particles, lime powder, bentonite, zeolite, etc. It has been used as this flocculant. However, the flocculant used here was excellent in flocculation sedimentation of the slurry, but dehydration was poor due to viscosity in the dehydrator and clogging of the filter by fine particles, resulting in poor dehydration water quality and high water content of sludge. There was a problem that excessive processing costs.

Therefore, as a method to solve the problems of the prior art as described above, Patent Publication No. 1999-0050180 published on July 5, 1999 in the first sludge in the first reactor before dehydration treatment as shown in FIG. 1000-3000 ppm of FeCl ₃ was added to form a floc, 900-1000 ppm of fiber was added in a second reaction tank, and calcined lime was added as a coagulant, and then 400-500 ppm of a cationic polymer coagulant was added to the third reactor and the mixing tank. The method of improving the dewatering capacity of the sludge consisting of two steps is described, but in this case, fiber is used as a coagulant additive, but the fiber is used by dissolving paper in water or in an emulsion state. Inevitably, the post-treatment cost is high, and expensive polymer flocculant is used in two stages in the third reactor and the mixing tank. Because of this, the processing cost increases, and as the coagulant additive is used, the paper is dissolved in water or the fiber in emulsion state is used, so the particle size of the coagulant gel is small, so that the time required for the coagulation sedimentation in the reactor is long and the water is dehydrated well. There is a problem in that it can not form a gel, and also there is a problem in that the aggregated sludge adheres in various dehydrators or the filterability is inhibited due to the breakage of the aggregated gel, thereby lowering the dehydration capacity.

In addition, in the prior art, since the wastewater (filtrate) dewatered from the dehydrator is discharged to the river or the soil as it is without post-treatment, there is a problem of contaminating the river or the soil due to the incompletely defiltered filtrate.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to reduce the time required for flocculation settling (gel) of the flocculation gel (gel) before the transfer of waste water from the flocculation tank to the dehydrator Due to the particle size, an inorganic flocculent aid is added to the flocculation tank to improve the dehydration ability of the moisture and to promote the dehydration capacity without the inhibition of filterability due to the breakage of the flocculation gel or the flocculated sludge. To provide a method and apparatus for treating wastewater.

Another object of the present invention is to provide a method and apparatus for treating biological wastewater by anaerobic and aerobic microorganisms using various types of fibrous carriers.

It is also an object of the present invention to provide a wastewater treatment method and apparatus by the sprinkling filter method using a fibrous biofilter plate assembly.

Another object of the present invention is to provide a wastewater treatment method and apparatus using a rock wool filter having two functions of a fibrous biofilter and a plant cultivation carrier.

The object of the present invention as described above, after storing the waste water, such as livestock waste water or domestic waste water in the storage tank and transported by a predetermined amount to the coagulation reaction tank, where the mixture is agitated by mixing and mixing the inorganic coagulant and the organic polymer coagulant, belt press type Sludge and water (filtrate) are separated and transferred to dehydrator, and sludge is incinerated (sewage sludge) or mixed with sawdust or chaff and used as fertilizer (livestock sludge) and water (filtrate) is a rock wool carrier. After the transfer to the primary aeration tank and the secondary aeration tank in order to aeration treatment, the sludge which is transferred to the sedimentation tank is transferred to the storage tank again, repeating the previous steps, and the water is passed through the multi-stage rock wool biofilter plate assembly to plant plants Organic wastewater treatment method and field according to the present invention configured to be discharged through the drainage installed rock wool filter Achievement by the present invention will be described in detail with reference to the accompanying drawings.

2 shows a schematic diagram of an organic wastewater treatment apparatus according to the present invention; 3a and 3b are installed state diagrams of the fibrous rockwool carrier embedded in the aeration tank of the apparatus according to the invention shown in FIG. 2, FIG. 3a is a plan view, and FIG. 3b is a side view; 4A and 4B are schematic views of the multistage rock wool biofilter plate assembly used in the device according to the invention shown in FIG. 2, FIG. 4A is a plan view and FIG. 4B is a side view, and FIG. 5 is a view shown in FIG. 2. In the device according to the invention is shown the installation state of the rock wool filter fixed to the drainage.

In the method for treating organic wastewater of the present invention, wastewater, such as livestock wastewater or domestic wastewater, is stored in a storage tank (A) and then transferred to a coagulation reaction tank (B) by a predetermined amount, where the mixture is stirred and mixed with an inorganic aggregation aid and an organic polymer flocculant. Making a step; Separating the sludge and water (filtrate) by transferring to a belt press type dehydrator (C) to dewater-filter; If the sludge is sewage sludge, incinerate it, and if the sludge is livestock sludge, mix it with sawdust or chaff and use it as fertilizer (livestock compost), and water (filtrate) is sequentially added to the primary aeration tank (D) and the secondary aeration tank (E). Transferring and aeration treatment; Then, it is transferred to the settling tank (F) and the sludge precipitated again is transferred to the storage tank (A) to repeat the previous step and the supernatant (water) is passed through the multi-stage rock wool biofilter plate assembly (G); The water passing through the rockwool biofilter plate assembly (G) is characterized in that the step of discharging through the waterway (H) is installed, the rock wool filter 26 is planted planted on the top (22).

In addition, the apparatus for treating organic wastewater of the present invention includes a storage tank A for storing wastewater such as livestock wastewater or domestic wastewater; An agglomeration reaction tank (B) for agitating by mixing and stirring a predetermined amount of waste water transferred from the storage tank (A) with an inorganic aggregation aid and an organic polymer flocculant; A belt press type dehydrator C for dewatering the coagulated sludge to separate the sludge and water (filtrate); A primary aeration tank (D) and a secondary aeration tank (E) for aeration treatment of the separated water (filtrate); A settling tank (F) for separating the sludge and water by precipitating the water (filtrate) treated in the first and second aeration tanks (D and E); A multi-stage rock wool biofilter plate assembly (G) for further treating the supernatant (water) separated from the settling tank (F); Characterized in that it consists of a drainage (H) is installed rock wool filter 26 for further purifying the water discharged through the rock wool bio filter plate assembly (G).

In the method and apparatus for treating organic wastewater of the present invention, the primary aeration tank (D) and the secondary aeration tank (E) are fibrous rock wool to treat water (filtrate) separated and transferred from the dehydrator (C) more efficiently. The carrier 10 may be embedded.

Fibrous rockwool carrier 10 embedded in the aeration tank (D and E) of the present invention is composed of a plurality of rock wool rods 11 of approximately 100x100x3000mm size is fixed by the fixing means 12 at intervals of 50cm to 1m from each other The multi-stage rock wool biofilter plate assembly (G) for further treating the water separated from the settling tank (F) is 10 cm to the support 13 fixed to the column 15, a plurality of filter plates 14 of approximately 100x1000x1000mm size There are about 10 stages (only 3 stages are shown in Fig. 4b) in a multi-stage spaced manner, which is installed on a shelf, and the number of stages can be increased or decreased depending on the processing scale. The fibrous rockwool carrier 10 and the filter plate 14 act as a microbial carrier to promote the growth of anaerobic microorganisms or aerobic microorganisms to promote the decomposition of contaminants by the microorganisms to increase the water purification efficiency.

Hereinafter, the method and apparatus for treating organic wastewater of the present invention will be described in detail.

In the present invention, a hydrophilic inorganic fiber is used as the inorganic coagulant adjuvant to be mixed and stirred in the coagulation reaction tank (B). The hydrophilic inorganic fiber (rock wool, glass wool or wollastonite) is 4-8 microns in thickness and cut into 1-30 mm. By mixing with organic polymer flocculant and FeCl ₃ , the flocculation speed is increased by 2-10 times, and the sludge of 92% water content is 74% water content as a result of dewatering sludge from pig flour using belt press. In addition, the suspended solids (SS) in the filtrate were significantly reduced from 365ppm to 120ppm, thus increasing the dewatering rate of the sludge, thus saving energy during incineration in the post-process and saving the use of sawdust or chaff during fertilizer production. Of course, the quality of the filtered discharge water can be improved. Rock wool also acts as a microbial carrier in an anaerobic and aerobic tanks to promote the growth of anaerobic or aerobic microorganisms, contributing to the biological treatment of degrading contaminants by these microorganisms.

When describing the hydrophilic inorganic fibers such as rock wool, glass wool or wollastonite used in order to enhance the flocculation rate of the sludge and to improve the dehydration rate in the present invention, the hydrophilic inorganic fibers are cut to a length of about 1-30mm to a suitable amount of sludge By mixing in the inorganic fibers, the organic fibers are bound together and coagulated in the same axis as the organic polymer flocculant and the organic particles, and the hydrophilic inorganic fibers are settled at a rapid rate because they are heavy relative to the weight of the organic aggregate, and the inorganic fibers form a lattice to pass only moisture And the sludge is bound to the fiber has the advantage that can improve the water quality of the filtered water.

For example, according to the present invention, by using the organic polymer flocculant 250-800ppm and rock wool 1,500-50,000ppm in the flocculation tank was able to reduce the sludge moisture content by about 18%, the dehydration rate was increased with increasing the amount of rock wool fiber.

A fibrous rockwool carrier (standard 100x100x3000mm wrapped with polyester net with 97% porosity) was hung vertically at intervals of 30 cm in each aeration tank, and microorganisms were attached to the carrier to buffer the change in concentration of organic matter in the wastewater. The nitrification and denitrification can be made well, and since the removal of excess sludge is smooth, there is an advantage that the effect of dephosphorization can be increased.

The wastewater filtered by dehydration in the dehydrator can be transported to the aeration tank, aerated, and then passed through the sedimentation tank and through the rock wool biofilter plate assembly to reduce BOD, COD, SS, TN, and TP secondarily. The structure of the bio filter plate is preferably a 10 x shelf filter layer in multiple stages using a rock wool porous plate of 100x1000x1000mm. At this time, the filtration rate is filtered at 0.2 ton / M ³ / HR filtration rate.

In FIG. 2, two aeration tanks of the first aeration tank D and the second aeration tank E are illustrated, but the number of aeration tanks may be increased or decreased depending on the size of the wastewater treatment plant.

In the case of livestock wastewater, it is difficult to completely discolor the color as red. As a countermeasure to solve this problem, a rock wool filter 26 made of a rock wool filter body 16 wrapped with a reinforcing material 18 such as a polyester net is installed inside a plastic or concrete drainage channel as shown in FIG. By planting 22), organic nutrients, such as residual nitrogen and residual phosphorus, are removed by the absorption of soil microorganisms and plants, and the wastewater can be rearranged by the reproduction of plants. The rock wool filter 26 is fixed to both sides of the drainage wall 24 by means of a fixed rod 20 or an epoxy adhesive.

In the present invention, the filtrate of 120 ppm of suspended solids was filtered through a rock wool filtration filter, and the filtrate of 9 ppm or less could be discharged.

Rock wool used in the present invention is similar to the soil component, there is no problem in the subsequent treatment, when used as a compost can give the effect of siliceous fertilizer.

As a result of increasing the organic polymer flocculant from 400ppm and rock wool fiber to 1,500ppm to 50,000ppm, the test result showed that the filterability was improved. Therefore, it was possible to save expensive organic polymer flocculant.

In the method and apparatus for treating organic wastewater of the present invention, since the hydrophilic inorganic fibers are cut into 1-30 mm and mixed with the organic polymer flocculant, the flocculation rate is increased by 2-10 times to increase the treatment time and the amount of the expensive organic polymer flocculant. As well as saving, the water content of dewatered sludge is reduced from 92% to 74% in the past, which saves energy during incineration and reduces raw material usage such as sawdust or rice hull during fertilizer production. have.

In addition, the rockwool biofilter plate for treating the fibrous rockwool carrier and the supernatant (water) separated from the sedimentation tank used in the aeration tank of the present invention acts as a microbial carrier to promote the growth of anaerobic microorganisms or aerobic microorganisms, Since the decomposition is promoted, there is an advantage that the purification efficiency of the water quality is increased.

Claims (5)

Storing livestock or domestic waste water in a storage tank (A) and transferring the mixed livestock to a coagulation reaction tank (B) by a predetermined amount to stir by mixing and mixing the inorganic coagulant and the organic polymer coagulant; Separating the sludge and water (filtrate) by transferring the agglomerated sludge to the dehydrator (C) and dewatering it; The separated sludge is incinerated or mixed with sawdust or chaff to produce livestock compost, and the separated water is sequentially transferred to the primary aeration tank (D) and the secondary aeration tank (E) for aeration treatment; The aerated water is transferred to the settling tank F, and the sludge precipitated is transferred to the storage tank A again, and the above-described steps are repeated, and the supernatant (water) is passed through the multi-stage rock wool biofilter plate assembly G. Processing; Disposing of the water passing through the rock wool bio filter plate assembly (G) through the drainage channel (H) is installed, the rock wool filter 26 is planted on the top of the organic wastewater treatment method, characterized in that the organic wastewater. . The method of claim 1, wherein the inorganic coagulant aid is a hydrophilic inorganic fiber such as rock wool, glass wool or wollastonite, and the fiber has a thickness of 4-8 microns and a length of 1-30 mm. According to claim 1, wherein the primary aeration tank (D) and the secondary aeration tank (E) is characterized in that the fibrous rockwool carrier 10 is embedded in order to more efficiently treat the water separated and transported in the dehydrator (C) Organic wastewater treatment method. An agglomeration reaction tank (B) for aggregating by mixing and stirring the waste water of a predetermined amount transferred from the storage tank (A) for storing livestock or domestic waste water with an inorganic aggregation aid and an organic polymer flocculant; Dehydrator (C) for dewatering the flocculated sludge; First and second aeration tanks (D and E) for sequentially aeration treatment of the filtered water; A settling tank (F) for separating and separating the aerated water in the above; A multi-stage rock wool biofilter plate assembly (G) for further treating the water separated from the settling tank; Apparatus for treating organic wastewater, characterized in that consisting of a drainage (H) is installed rock wool filter 26 to further purify the water discharged through the filter plate assembly (G). According to claim 4, The dehydrator (C) is a belt press type dehydrator, the aeration tank (D and E) a plurality of rock wool rods (11) of about 100x100x3000mm size fixing means 12 spaced from each other 50cm to 1m The fibrous rockwool carrier (10) is configured to be fixed vertically by a), the multi-stage rockwool biofilter plate assembly (G) is a plurality of filter plates 14 of about 100x1000x 1000mm size is fixed to the column 15 Apparatus for treating organic wastewater, characterized in that it is installed in multiple stages at intervals of 10 cm on the support (13).

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