KR100545872B1 - Coagulation method of sewage and waste water by using magnetite powder - Google Patents

Abstract

It is an object of the present invention to provide a method for efficiently removing the suspended solids (SS) contained in sewage and waste water while discharging the sludge amount.

To this end, the present invention, when the magnetized magnetite powder is injected into the coagulation reaction tank 1 together with the wastewater and stirred, the magnetite magnetite powder becomes the nucleus of the coagulation and aggregates with the solids in the wastewater. The flocculant was sent to the flocculation tank 2 to inject the polymer coagulant, followed by slow stirring to form flocs in order to facilitate precipitation in the precipitation tank (5), and then transferred to the precipitation tank (5). 5) It is precipitated in the lower part, and the blue water is sent to the treatment water tank by overflowing the weir (Weir) in the upper part of the sedimentation tank (5) and then sent to the aftertreatment process by the treatment water transfer pump (9). The sludge is sent to the sludge hopper (Sludge Hopper 10) of the magnetite recovery process by the settling sludge transfer pump (7), and the magnetic magnetite powder is attached to the rotating magnet roller (Roller) 11 installed at the top of the scraper ( Separated by a scrapper Magnetite feed conveyor (Conveyor: 12) and re-conveyed to the flocculation reaction tank (1) by, a magnetite sludge is removed, it is sent to a sludge storage tank.

Of particular note is that sludge emissions are reduced by the solids produced by the hydroxides of these flocculants, compared to the flocculation of flocculants such as iron chloride, iron sulfate, alum, and poly aluminum chloride (PAC). Since it is not necessary, the treatment cost is greatly reduced and the treatment efficiency is almost the same.

Magnetite, wastewater, magnets, flocculation, agitation, sludge, suspended solids (SS)

Description

Coagulation method of sewage and waste water by using magnetite powder

1 is a coagulation treatment process chart of wastewater using magnetite powder

[Explanation of symbols on the main parts of the drawings]

1: coagulation reaction tank 2: coagulation reaction tank stirrer

3: flocculation tank 4: flocculation tank stirrer

5: settling tank 6: settling tank (Rake)

6: Sludge Transfer Pump (Pump) 8: Treatment Tank

9: Treated water transfer pump 10: Sludge hopper (Hopper)

11: Magnet Roller 12: Recovered Magnetite Conveyor

The present invention aggregates and removes suspended solids (SS; Suspended solid) contained in sewage and sewage in a sedimentation tank using magnetized magnetite powder, and then the magnetite powder is recovered in a recovery process. The present invention relates to a flocculation treatment method having a low operating cost while minimizing sludge generated by reuse.

In general, the flocculation method of suspended solids contained in sewage and waste water is coagulated by injecting flocculants such as iron chloride, iron sulfate, Alum, poly aluminum chloride (PAC) and polymer coagulant aid, and then separating and removing them from the settling tank. The method is common, and most of the sludge generated is occupied by the hydroxides of these flocculants, and the amount of the sludge generated is high, resulting in high waste disposal costs and high operating costs because the neutralizer is consumed to neutralize these flocculants to produce hydroxides. There is a problem, and the sedimentation rate is increased by increasing the specific gravity of the sludge by using the spinel structure of Ferrite metal composite oxide powder of Korean Patent Publication No. 1994-0000550 and flocculant such as alum, PAC, and FeCl ₃ . Although there are ways to improve, this also has a lot of problems The.

The present invention is to provide a method for coagulation removal of suspended solids contained in sewage and wastewater with low sludge generation amount and low operating cost in order to solve the above problems.

In order to achieve the above object, the present invention utilizes magnetite magnetite powder as a nucleus for flocculation to flocculate suspended solids contained in sewage and wastewater, and then precipitates and separates them in a sedimentation tank. Because it recovers and reuses it, it proposes a flocculation treatment method with low operating cost because it does not need neutralizer while minimizing sludge generation.

When the magnetized magnetite used in the present invention comes into contact with water (fluid), magneto-hydro-dynamics (MHD) voltage is generated, and the magnetite surface exhibits a charge while the floating solid material in the water. As it is collected by electric attraction, it acts as a nucleus of aggregation, and as water passes through the magnetic field of magnetite magnetite, the aggregate of water molecules is caused by the wave of electrons. As the microstructure becomes smaller, the surface tension decreases, the penetration force improves, solubility improves, deodorization efficiency improves, and cell membrane permeability of microorganisms improves in the later biological treatment process. It is effective in activating the metabolic activity of microorganisms.

Hereinafter, the contents of the present invention will be described in detail with reference to the drawings.

When the sewage and wastewater flow into the flocculation tank 1, a powder obtained by pulverizing magnetite magnetized with a magnetic flux density of 200 G (Gauss) or higher to about 40 to 60 µm is injected and stirred by the reaction tank stirrer (2). In this case, suspended solids are trapped on the surface of magnetized magnetite, which acts as agglutinating nucleus, causing coagulation. The sewage and wastewater in which suspended solids are aggregated is sent to the coagulation tank (3). While slowly stirring with a flocculation tank stirrer 4 while injecting about 3 mg / L, precipitates are easily formed in the precipitation tank 5 and then sent to the precipitation tank 5.

In the settling tank (5), the flocculated suspended solids are settled in the lower part of the settling tank, and the blue solid water from which the suspended solids are removed is overflowed to the weir (top) of the settling tank (5), and then treated. It is sent to the post-treatment process by the water feed pump (9), and the precipitated sludge is sent to the sludge hopper (Sludge Hopper: 10) of the magnetite recovery process by the sedimentation sludge transfer pump (7), and the magnetic magnetite powder is a rotating magnet installed on the upper part. Once attached to the roller 11, it is separated and recovered by a scraper and returned to the coagulation reaction tank 1 by a recoverer iron transfer conveyor (Conveyor 12) for reuse, and the sludge from which the magnetite is removed is transferred to the sludge storage tank. Send it to a post-treatment process such as dehydration treatment

Example 1

150 ~ 200㎥ / day of wastewater discharged from squid processing plant is injected with 800mg / ℓ of powder pulverized magnetite with magnetic flux density of 220G (Gauss) to 50㎛, and then 3mg / ℓ of polymer coagulant is injected. After precipitation, 500 mg / l of water and supernatant of supernatant water were injected and stirred, followed by neutralization treatment with caustic soda (NaOH) to pH 7, followed by precipitation with 3 mg / l of polymer coagulant. The water quality of the superior water is shown in Table 1.

As described above, in the present invention, as a result of flocculation of the suspended solids contained in the sewage and wastewater by magnetizing magnetite powder, the flocculation agent is neutralized with a neutralizing agent after injecting a flocculant such as an alarm. As the treatment efficiency is almost the same, the magnetic magnetite is recovered and reused, and the amount of sludge generated is very small and the neutralization agent is not required. Therefore, the operation cost is low, and it is expected to be widely used in the condensation treatment of sewage and wastewater.

Claims (1)

In flocculation sedimentation treatment of suspended solids (SS; Suspended Solid) contained in sewage and wastewater, when the sewage and wastewater flows into the coagulation reaction tank (1), magnetic agglomerated magnetite powder is injected and stirred to agglomerate suspended solids. Floating into the flocculation tank (3) to form flocs (Floc) while slowly stirring the flocculation tank stirrer (4) while injecting about 2-3 mg / L of the polymer flocculant into the flocculation aid (3). Solids are settled in the lower part of the settling tank, and the blue water from which the suspended solids are removed is overflowed by the weir of the upper part of the settling tank 5 to the treated water tank 8, and then, by the treated water transfer pump 9 The sludge is sent to the post-treatment process, and the sludge is sent to the sludge hopper (Sludge Hopper 10) of the magnetite light recovery process by the settling sludge transfer pump (7), and the magnetite magnetite powder is attached to the rotating magnet roller (Roller) 11 installed at the top. By the scraper In the coagulation treatment process of sewage and wastewater, the magnetite recovered by separation is returned to the coagulation reaction tank 1 by a recovery magnetite conveying conveyor 12 and reused, and the sludge from which the magnetite is removed is sent to a sludge storage tank for treatment. A method of flocculation of solid suspended solids (SS) using magnetized magnetite powder while minimizing sludge generation.

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