JPS6041593A - Treatment of waste liquid of shochu(low-class distilled spirits) - Google Patents

Abstract

PURPOSE:To obtain good fodder or fertilizer and to make final effluent of the waste liquor harmless by separating the solid from the liquid of waste liquor of SHOCHU, drying the solid by the heat of combustion of methane recovered by fermenting the filtrate, and performing aerobic treatment of eliminated liquid obtd. after fermentation. CONSTITUTION:Waste liquor 1 of SHOCHU production is introduced into a high- speed centrifuge 4 with a sludge transporting pump 3; dehydrated cake is taken out and allowed to contact with hot air generated by a methane gas burner 8 of a dryer 7 to produce dry product 10 and supplied to market. On one hand, separated filtrate is fed to a methane fertilization tank 13 and org. materials in the feed are digested quickly and transformed to methane and CO2 while maintaining the concn. of fungus useful for fermentation at high concn. Digested liquid is charged to a separation tank 16, and generated gaseous metane is separated and supplied to a burner 8. SS fraction is concentrated and settled, and mixed into a tank 13, and supernatant liquid is fed to an aeration tank 23 where BOD in the liquid is removed. Cake is separated from the treated liquid by a filter 27 and is utilized as fertilizer after drying naturally, and the filtrate is discharged after inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recycling waste liquid discharged from a shochu manufacturing process in a non-polluting manner that has a large energy-saving effect.

Conventionally, shochu waste liquid is discharged as a viscous waste liquid containing a solid content of 6~/θ, and is generally sprayed on the soil as it is for natural decomposition.

■After sufficient dilution and aerobic treatment, the sludge is composted and the wastewater is discharged.

■ Perform anaerobic treatment using methane fermentation method to recover methane gas, separate digested sludge and turn it into fertilizer, and aerobically treat the desorbed liquid before discharging it.

(2) Solid and liquid are separated using a filter, the dehydrated cake is fed and sold externally as fertilizer, and the filtrate is treated by diluting it sufficiently and subjecting it to aerobic treatment.

However, BOD approx. SSθθθpp”% organic matter 6
Disposal of waste liquid containing ~10CX is quite difficult and causes various problems.

The most popular method is spraying it on farmland or mountain forests, but there is little room for it to be accepted when large quantities are generated from large-scale factories, and although dumping into the ocean is also carried out in a small number of cases, In some cases, transportation costs are high and regulatory issues remain. There is also a method of distributing it as feed to livestock farmers, but this only works if special favorable conditions are met.

Aerobic treatment method ① is a conventional activated sludge method or a recently developed batch-type high-efficiency method.
It is necessary to reduce D by approximately 15θ0 to 3θθθppmKm, and as the amount of treated water increases, both equipment costs and operating costs become enormous.

Methane fermentation method (2) has been considered to be a relatively good method, and there are some examples of it. In particular, high-temperature fermentation methods that take advantage of the fact that wastewater is discharged at approximately 90°C and high efficiency are expected! Tank fermentation method (PH5
,,3 and 0) have been studied, but 88 minutes is 6~
It is quite difficult to maintain fermentation as a homogeneous suspension while stirring the slurry present in the fermentation process, and although the effect has been recognized, there are few examples.

In order to overcome the drawbacks of the various conventional treatment methods described above, the present invention first separates most of the solids in the waste liquid, creates a cake with a reduced moisture content, and then dries it using the recovered methane gas as fuel. The organic matter-containing waste liquid from which solids have been removed and processed into high-quality feed or fertilizer products has a concentration of 3 (2θθθppm).
Methane fermentation is carried out with high concentration of BOD inside and outside. Most of the organic matter is solubilized and fermentation progresses extremely quickly. The purpose of the present invention is to provide an economical resource processing method that allows for downsizing of fermentation equipment and greatly reduces both equipment costs and operating costs.

Next, embodiments of the present invention will be described based on the drawings.

The charred 11v waste liquid (1) obtained by steaming the charred φ pieces is stored in a receiving tank (2), and quantitatively sent to a high-speed centrifuge (4) by a slurry pump (3). The high-speed centrifuge (4) separates solid and liquid with a centrifugal force of about -25θ0 to 5θθθG,
The cake-like solid material, which has been dehydrated to a moisture content Sθ~6%, is pulled out by a screw (5) and deposited.

The solids are transferred to a conveyor (6) and transferred to a rotary dryer (7).
), it is brought into AC contact with the hot air generated by the methane gas burner (8), and is discharged as a dry product with a moisture content of approximately 69σ, which is sold externally as a product +lQl.

The separated filtrate is stored in a receiving tank Qp and quantitatively pumped (12
1 to methane fermentation 4 @ LI31. This fermenter is equipped with a filling temperature IW, which maintains fungi useful for fermentation at a high temperature IW, and quickly digests organic matter in the feed liquid and converts it into methane gas and carbon dioxide gas. Fermentation (approximately 37°C) is standard. Waste liquid (1) is usually f0
Since it is discharged at a high temperature of ~90°C, the temperatures of the receiving tank (2) and the temperature of the warmer tank (2) and 0°C will be 60°C and 30°C, respectively, but when the temperature drops, the heat exchanger ++51 will raise the temperature Maintain the temperature inside the fermenter.

The left side h+t41 uses plastic, natural wood and bamboo, pumice, coke, brick scraps, fibers, etc., but has a surface shape and surface area that allows fungi to easily attach and be sufficiently retained.
Use easily available materials by molding them. The digestive juice enters the sedimentation separation tank aω, where the generated methane gas is separated.
8 minutes are concentrated and settled, and concentrated 8B is quantitatively drawn out from the tank D and mixed into the liquid supply line by pump ez. The -L clear liquid +171 of the sedimentation separation mark enters the aeration tank (23H, and the BOD in the liquid is removed with air blown from the blower ■.In this case, the tank is also filled with M4 material (1 da) 1241 as contact cutting. It is better to charge the liquid after treatment.The treated liquid may be sent to the filter by adding a pump, or a part may be returned to the aeration N as return sludge. ) is accumulated and carried out as fertilizer after air drying, and the filtrate Q9 is discharged after inspection.

The fermentation rate in the methane fermenter +131 is extremely fast, because most of the organic matter in the feed liquid is solubilized, and fermentable fibers, coagulated proteins, etc. are separated and removed as sludge. , fillers (1ω) can also be used with fine grains or products with a fine composition that have a large specific surface area because there is no risk of clogging. Methane bacteria, which have poor aggregation and adhesion resistance, have a growth rate that is lower than that of other fungi that coexist with them. Since it is extremely slow, if a large proportion of the fermentation liquid is washed away, the M in the tank will decrease, which will be a factor that affects the methane fermentation rate.The methane bacteria retained on the surface of the filling will maintain the fermentation rate. The methane gas and carbon dioxide gas generated in the 0 fermentation tank enter the sedimentation separation tank (along with the homogeneous gas generated from 10, via the pipe G mark, desulfurizer t+!), where the hydrogen sulfide contained is desulfurized from iron hydroxide, etc. The fermenter 131, which has been thoroughly insulated, maintains the internal pressure at about !θθ ~ water column, and is removed from each manhole and the gas tank (21). , the seals of the liquid piping attachments, etc. have been completely completed.

An example according to this invention will be shown.

■Raw materials/Wheat roasted t, waste liquid components ■High-speed centrifugation test results Test machine High-speed decanter (ball diameter 23θ1 to φ x ball length 690%) Liquid supply amount to θθ% Room temperature solid discharge 33.7 k) - Appearance of dry/n separated liquid Pale yellow opaque SS in supplied liquid SS 5θθθm color/e 88 33θθm in separation T υ1Mfj Moisture in solid proboscis 709σ Solid recovery rate Approximately 9g% Ball rotation speed sI2θOppm Centrifugal effect 3SθθG Recovery The solids are soft cake-like and have a moisture content of 709% (they can be used as feed as is, but they need to be dried for convenience of storage and transportation and to prevent spoilage).

■Components of dry solids Nutrients including protein and crude fat, as well as fiber and soluble nitrogen-free substances, are also suitable as additives for animal feed.

■Components of Separated Liquid Although some SS is mixed, it is a solution that does not pose a problem for high-rate methane fermentation treatment using packed materials, and is extremely suitable for anaerobic treatment, and becomes the liquid after methane fermentation as it is.

■High rate methane fermentation treatment (a) Fermentation conditions Temperature: 37°Q f, 2'Q PH7,s~7. f O 几 P3θθmV Residence time in the tank Approx.
? Organic matter fermentation is extremely fast, as most of the organic matter in the filtrate is soluble, and the time-consuming process of dissolving solids in normal methane fermentation is not necessary, and the production of organic acids etc. begins immediately. It is. In particular, since there is little SS, no clogging phenomenon occurs in the densely packed material, and the solution distribution and degassing are performed in a PJli style, so the methane bacteria group retained on the entire surface of the filler is active.

(C) Components of the desorbed liquid (filtrate after methane fermentation) Both BOD and COD are well removed from the desorbed liquid after methane fermentation.
88 minutes is extremely small, 88 minutes is returned as much as possible, and the supernatant liquid is subsequently subjected to aeration treatment.

Next, wastewater that could be discharged was obtained by continuous filtration using a drum filter. BOD in the waste water was approximately /θθppm.

(d) Examination of the amount of heat for drying solids Solids in 1g of incineration waste liquid Approximately ttskg Moisture contained in the solids that have been dried Approximately 795kg Heat required for drying l (assuming efficiency of 65) Approximately/θθ, θθθKaa, 9 times Calorific value of the collected methane gas: approx./θg, θθθKca # (recovered gas /β x Otsu5 uKca) recovery rate of solids,
The balance of heat will change due to differences in dehydration conditions and fluctuations in organic matter in the filtrate, but if approximately 3X of organic matter is dissolved in the filtrate, the required amount of heat can be obtained, and dry feed with a moisture content of 6% or less can be obtained. Approximately gu θ ~ gu j 橡 can be recovered.

Since the present invention is a treatment method similar to that described above, compared to conventional treatment methods, it is possible to produce useful dry feed or fertilizer from unburned waste liquid, which is difficult to treat. It can be realized economically and energy-savingly with a simple system by combining treatment methods, and is a recycling treatment method with remarkable pollution prevention effects.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing an example of a treatment process for unburnable waste liquid. (3) is a pump for pumping waste liquid, (4) is a high-speed centrifuge, (7) is a dryer for filter cake, port 3 is a methane fermentation tank for filtrate, and (to) is a pump for removing desorbed liquid. Aerobic treatment equipment, (2)
indicates a filter for the treated water after aeration.

Claims (1)

[Claims] A high-speed centrifuge is used to separate waste liquid containing a large amount of organic matter generated during the production of shochu into solid matter and liquid, and the liquid is subjected to methane fermentation treatment to digest and decompose the organic matter contained, and methane gas is recovered. , is used as fuel to dry the solid matter to produce high-quality feed or fertilizer, and after the methane fermentation process, the desorbed liquid is made harmless through aerobic treatment and then released. Processing method.