JPS5992098A - Disposal of waste liquor containing organic substance - Google Patents

Abstract

PURPOSE:To efficiently convert organic substance, etc. in waste water into energy, by treating waste water containing organic substance with an ultrafiltration membrane, methane fermenting the resulting conc. liquid to recover methane, and separating a filtrate into a conc. liquid and pure water using a reverse osmosis membrane. CONSTITUTION:BOD-contg. waste liquor 13 formed in a factory for processing animal and plant materials is gathered in a reservoir tank 13, bulky garbage is removed from it with a simple filter 32, and then said waste liquor is poured in an ultrafiltration device 34 under pressure. The obtd. filtrate 46 is sent through a filter 47 to a reverse osmosis membrane 49 to separately filter organic substance from it. In a methane fermentation tank 37, its organic oxidation and alcoholic reaction are brought about as such, and fermentation is promoted at an extremely high speed. Formed amino acid, lower aliphatic acids and alcohols are digestively decomposed into methane and carbonic acid gas by the action of methane bacteria in succession. After about 0.4% H2S contained in formed gas 43 formed in the fermentation tank 37 is separated by a desulfurizer 44, said formed gas 43 is reserved in a gas tank 45.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses waste liquid containing organic matter discharged from factories that process animal and plant materials to carry out normal aeration oxidation treatment, which requires the addition of diluted water of around 10,000 ppm. BOD of
(biological oxygen demand), and oxidation treatment requires heating and pressurization, which increases the cost of special equipment and treatment, and the use of O12-enriched air. In order to carry out anaerobic treatment such as waste liquid that requires
01) Conversion from several thousand ppln to ten thousand pl) Comparison of 10000 pl) Concerning an economical, non-polluting, and resource-friendly treatment method that has a large energy-saving effect on waste liquids generated in an inner pot.

Conventionally, it was unknown that high-quality waste liquids and materials generated from soil factories for producing meat, vegetable protein, etc. are treated to make them non-polluting as they also serve as fertilizers, feeds, etc., and dilute wastewater such as BOD, etc.
2θθθp) Wastewater of 3 m or less is purified by oxidation treatment such as air blowing method and then released.

However, the target of the present invention is 1301) Several thousand to 10,000 pfll medium-quality waste liquids are subject to the above-mentioned recovery treatment,
Also, it is economically and technically unsuitable to perform oxidation treatment in the same state (2, at present, it is diluted to 6./θ times BOl) / θθθp pm Ja under warm air treatment. I do.

Blow-in of oxygen or oxygen-enriched air, Blow-in of air while heating, Blow-in of air in a pressurized container, etc. have been carried out, but these methods are expensive in processing cost, and waste organic matter 801. ) as a pollution source, consuming many liters of energy and being totally useless CO2. It is oxidized and released into SO2, NOx, etc. The disadvantage of method (a) is that it consumes a lot of water and requires construction of a large-scale oxidation tank;
Methods (2) and (3) also require special equipment and a large amount of power consumption.

The general processing method currently implemented at fish factories, etc. is explained based on Figure 1.
) is weighed using a scale (2) and placed in the steamer (3).

Steam (4) of about 'lwcA is blown in and heated to J-θ'C, and then the juice is removed using a press (5).
) and processed in a dryer (7) at low temperature under ir to prevent deterioration to obtain a dried fish meal product (8). The fish juice (9) is sent to the centrifuge 00 together with the heated steam drain, and the fish oil αD is recovered and sold externally as product 02J. Fish juice is collected in a C13Fi storage tank from which oil has been separated.
11 was heated and concentrated using a sieve to make fish soluble Q7).
Toshi τ will be sold outside. The amount of heat consumed in the multi-effect can α4, 4, (11) to turn the extremely low yielding fish juice into a concentrated product with a moisture content of 309σ reaches 7θK, which is the fuel consumption of a fish sludge processing factory. #: Drain of emitted steam (to)
Since it cannot be discharged as it is due to contamination with concentrated components, it is discharged after removal in a septic tank (layer B01 with aeration treatment at 1 value). Dryer (7) and multi-effect can (14)・(lυ・(1
The exhaust gas from t9 has a strong odor and is collected in machines (1) and 12+), and then incinerated together with fuel (c) in a boiler @.

As mentioned above, the multi-effect canning #@concentration method is generally practiced as a method for treating fish juice in fish processing plants. In this case, organic matter/~29σ fish juice is vacuum evaporated, but it is evaporated at a relatively low temperature to prevent scaling and spoilage.

The product is a solid feed soluble fertilizer.The price of the evaporative fuel used in the above-mentioned multi-purpose cans has recently gone up by 6,000 and the price of the product has fallen, making it economically viable. Some factories have been forced to shut down operations, and waste disposal facilities for fish paste products and canning factories are essential and have become a social problem. In addition, the exhaust gas and drain from the evaporator require treatment of foul odors and organic matter contained therein, which is often uneconomical in terms of equipment.

The above-mentioned waste liquid containing intermediate concentration BOD, which is relatively difficult to treat, is generated in various places and is subject to strict pollution regulations.

In order to overcome the drawbacks of the various conventional treatment methods as described above, the present invention provides an economical treatment method by incorporating methane fermentation treatment to convert the contained organic matter and BOD to energy resources and recover them. The entire purpose was to

Next, an embodiment of the present invention will be described based on Figure ml.

Among the waste liquids generated in factories that process animal and plant materials, excluding high-bacterial liquids that can effectively recover government property and dilute liquids that are more economical to be treated with IM air as they are.
m to about /10,000 to -10,000 I) Waste liquid containing about I) 03
Collect in storage #J6υ. A simple filter [φ(
The concentrated fish juice and scraps obtained in this way contain about θθθppi11 organic matter and are suitable for methane fermentation treatment. Adjust the concentration and draw out the sludge. Mix this with seed sludge in the ignition tank (1), and send the seeding to the methane fermentation tank (2).

The liquid that has passed through the ultrafilter (b) contains f^1 low-molecular-weight organic matter in /θ0θ~koθθθppm, so it is pumped through 14 simple filters to prevent foreign matter from entering. ,
The osmotic membrane (1
Send to 1. The organic matter is concentrated using a reverse osmosis membrane (because it does not have a channel through it, it is concentrated and collected outside the vessel, and is added to the fish juice storage tank C3υ for treatment. It is collected in a water tank (2) in the factory and reused.No effluent is produced from this system.

Fermentation progresses extremely quickly in the methane fermentation tank C. This is because most of the organic matter in the liquid supply is dissolved and b is caused by facultative methane bacteria. This is because the steps of decomposition and solubilization of I-1 are unnecessary, and the casing/organic conversion and alcoholization reactions occur. Generated tamino acids, lower fatty acids,
Alcohol is subsequently digested and decomposed into methane and carbon dioxide by the action of methane bacteria.

The fermentation tank (B) is stirred once by operating the stirring pumps (7) and (G) in order to equalize the temperature and ensure contact between the organic solute and the methane fungi. In addition, methane bacteria adhered to the filled multi-layer board L- (b) and it became ladleful.

It comes into contact with organic matter in the circulating flow and accelerates decomposition and digestion. The inside of the fermentation tank rrh is divided into sections by partition walls to prevent the supplied liquid from entering the outlet.

The generated gas (2) generated in the fermentation 41N (2) is stored in a deflow device (in a gas tank except for H2S containing about θ'l 3'6' at →). The recovered gas that covers the heating ridge of approximately 6θθθICca13/lr/ is used in boilers, etc. to save fuel.

Some of the steam generated in the boiler is transferred from the blowing pipe to the fermentation tank (
(b) It is used for heat retention, and the temperature is automatically regulated.

Digested liquid extracted from fermentation tank I is first separated from sludge in a sedimentation tank (B), and then sent to a recirculation stage using a pump (with a pump), and then sent to a mixer and a water supply. The upper liquid content in the sedimentation tank (b) enters the receiving tank and is sent to the oxidation tank by a pump.

COD (Chemical Oxygen Demand) is decomposed and purified by aeration treatment, added with sedimentation agent 6D, flocculated in a stirring tank (→), and then sent to a filter in a pump (→) for 88 minutes (suspended solids). The filtrate is poured into a methane fermentation tank and the digestion process is repeated, and the purified filtrate is discharged.

It is something to do.

The ultrafilter used in the present invention has a throughput of raw fish juice of 1117 days qθ℃〃
Organic matter concentration /θθθθppln Concentrated liquid organic matter concentration
GθθθθppHl Permeated water organic matter concentration /Sθ
θppln Ultrafiltration membrane type Teufler type module 3 Water membrane area 23. i"/percentage of water around this module -2ni"/day of this module The inlet pressure is lIMtIi, the molecular weight fraction is θθθ, and the amount of treated liquid for reverse osmosis is 31ν days! j℃〃 Organic matter concentration /θθθ～-θθθp pHl concentration Liquid organic matter concentration θθθppHl Permeate water organic matter concentration /θθppHl or less Inverted V = Gland type
Spiral type element membrane area? −
/ This - Knee element organic matter removal rate of 95 or higher, the normal pressure is 3θ, A, and the fermentation temperature of the methane tank is 37℃, 2-Q, and automatic adjustment by steam blowing.
) (7A; -4θ 0 几P −, 2θθ ~ 3θθm
v Fermentation time / θ days Stirring Pump circulation tank module )) Nikam qlJ plastic multij
- Returned sludge filled with plate Return generated gas based on SSd degree in the tank 5π 00215% calorific value 6θθθk at 0 port 47j
C prefecture? Generated amount /d/Ky - input organic matter was used.

Next, results obtained by the conventional method and results obtained by the present invention will be shown.

A. Fissieso 1 tsuyupuru production method by bell 1 daughter shrinkage according to the conventional method) Processed raw material Caustic line θt / Mortar fish juice 11017 days Concentration J
θθθppm Fuel A-lin oil (for steaming and concentration) L
3 β/Daily water /θ76t/day B6 Treatment according to the present invention (raw materials are the same as A) Fuel A4 oil (only for # point use)/J/Daily water 9 no 2
1/ Since the Japanese invention uses the above-mentioned treatment method, it can save a lot of fuel compared to the conventional treatment method, and the system of the present invention supplies the ultrasearch permeate liquid as the supply liquid. As a result, the AJL treatment of the feed liquid, which is a drawback of the reverse osmosis membrane method, has been completed completely, and the system is operating extremely smoothly. There are no problems with the pH or temperature of the treated solution, and it is necessary to backwash the filtration membrane and periodically sterilize it, but since the concentrated solution is for methane fermentation and the permeated water is also used for industrial purposes, it is a medical problem. There is no need for the strict control that would be required when using for food or drink, making the operation extremely simple. In addition, by using it for separating and braiding rough organic matter, it is possible to use 1i°1 mainly for membrane treatment of door liquids from various places containing organic matter with Bol) values ranging from several thousand ppln to 10,000 ppm, which is extremely difficult to treat in the past. It is a non-polluting processing method that can be concentrated in a simple manner and used to digest animal and plant organic matter in any form using methane fermentation and convert it into energy. It is an extremely economical and energy-saving method that can be applied to the treatment of wastewater from legume processing factories, wastewater from defrosting fish, etc.

[Brief explanation of the drawing]

FIG. 7 is an a5a clear view showing an example of the work process of the conventional Uozu processing factory, and FIG. 2 is an explanatory view showing the first embodiment of the present invention. 6...filter, (c)...ultrafilter, (@...methane fermentation tank, (g)...reverse osmosis filtration membrane. Nihon Kaihatsu Consultant Co., Ltd. No. 1 Figure Procedure Amendment 1982-2015 Mr. Kazuo Wakasugi, Commissioner of the Patent Office], Case Indication 1982 Patent Application No. θ3-2 Core No. 2
Title of the invention Method for treating waste liquid containing organic matter 3 Relationship with the case of the person making the amendment Patent applicant address (residence) 94tS, Oaza Shinmachi, Onishi-cho, Ochi-gun, Ehime Prefecture
Address (and 1 other person) 6. Subject of amendment Section 7 of the detailed description of the invention in the specification, Contents of the amendment Amended as shown in the attached document "qθ0θ" in the first line of page 2 of the specification of the application, "
q0θθθ”.

Claims (1)

[Claims] Foreign substances are removed from the waste liquid using a coarse filter, and the filtrate is separated into concentrated liquid and permeated water using an ultrafiltration membrane.The concentrated liquid is subjected to methane fermentation treatment to efficiently digest the organic matter contained and generate methane gas. The deodorized desorbed liquid discharged from the methane fermentation tank is discharged into an aeration treatment area, and the water that permeates through the ultrafiltration membrane is passed through a reverse osmosis membrane. Separate into concentrated liquid containing organic matter and pure water using
A method for treating waste liquid containing organic matter, in which the concentrated water is returned to the methane fermentation tank for processing and decomposition, and the purified water that passes through is reused within the factory.