JPS60150885A - Method for recovering valuable material from organic waste liquid - Google Patents

Abstract

PURPOSE:To recover with reduced time and equipment by acid-fermenting the organic waste liquid under high liquid pressure while supplying an oxygen-contg. gas, and then recovering the valuable materials with a selective permeable membrane. CONSTITUTION:The high-concn. organic waste liquid such as the waste liquid from foodstuffs is supplied into a deep tank-shaped bioreactor 2 from a supply passage 1, and circulated successively through a downward flow passage 2a, an upward flow passage 2b, and a pump flow passage 2c while blowing an oxygen- contg. gas such as air into the downward flow passage 2a by a blower B and nozzle 2d. Accordingly, organic acids such as acetic acid, propionic acid, and butyric acid are formed from the organic materials in the waste liquid. Then the liquid is sent into the first membrane separator 3 and the second membrane separator 4 to recover the organic acids.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering valuable materials from organic waste liquid.

Conventionally, organic waste liquid was subjected to acid fermentation in an anaerobic atmosphere in a bioreactor, and then almost all of the organic acid in the waste liquid was converted into methane gas as a valuable product by methane bacteria. The drawbacks were that methane fermentation took an extremely long time and required a vast area.

An object of the present invention is to make it possible to greatly reduce the time and site required for collecting valuables compared to the conventional method, and to make it possible to manage the amount of time and space advantageously in terms of power.

Method for recovering valuables from organic waste liquid according to the present invention) 4I & means performs acid fermentation of organic waste liquid in a bioreactor under high liquid pressure while supplying oxygen-containing gas, and collects organic acids in the acid-fermented organic waste liquid. The purpose is to recover the liquid using a selectively permeable membrane and applying high liquid pressure inside the bioreactor, and its effects are as follows.

In other words, as a result of various experiments, it was discovered that acid fermentation by bacterial cells, which was previously thought to be possible only in an anaerobic atmosphere, can be carried out satisfactorily in an aerobic atmosphere, and in fact more actively than in an anaerobic atmosphere. Therefore, by exploring the bioreactor and increasing the oxygen concentration sufficiently to carry out acid fermentation, we were able to greatly improve the acid fermentation capacity.

Furthermore, instead of methane fermentation, which takes several tens of days, organic acids can be recovered as valuable products through dialysis separation.
Now it can be processed in about 4 to 5 hours.

As a result, the time and site required to process organic waste liquid can be greatly reduced, making organic acid recovery practical even in areas where land prices tend to be difficult to secure, such as in urban areas where land prices are soaring. I became a VC.

Furthermore, by effectively utilizing the high hydraulic pressure of the bioreactor, which increases the overall efficiency of acid fermentation, to obtain the pressurizing force required for separation, forward efficiency can also be improved, making the process advantageous in terms of running costs. It became so.

Next, an example will be shown with reference to FIG.

Various types of sludge generated from water treatment, etc., desorbed liquid from heat-treated sludge, food waste liquid, and other high-concentration organic waste liquids are supplied from the supply path fl+ to the exploration type / ), in the descending flow path (2a)
, the ascending flow path (2b), and the pump flow path (2c) in this order, and oxygen-containing gas such as air is passed through the blower 181.
Then, the organic waste liquid is blown into the descending flow path (2a) from the nozzle (2d) K, and the organic waste liquid is acid-fermented by the bacterial cells while supplying oxygen-containing gas under high liquid pressure, and acetic acid, propionic acid, and acetic acid are extracted from the organic matter in the waste liquid. generates organic acids such as

The organic waste liquid subjected to acid fermentation in the bioreactor (2) is supplied to the first membrane separation device (3) attached to the bottom side of the bioreactor (2), and in the first membrane separation device (3), it is subjected to reverse osmosis III. The organic acid selective permeation effect by (!3a) and the pressurizing force required for its permeation are applied to the bioreactor (2).
The organic acid is recovered by applying high liquid pressure within the tank.

The recovered organic acid is sent to the second separator +4) VC, and the second
The organic acid is separated into two types using the simulated separation device (4), and the low-molecular organic acid is collected in the first recovery path (611/C, and the high-molecular organic acid is recovered at ￥J2 F@f15). :send.

The organic wastewater from the first vertical separator (3) is collected in the water treatment facility i7.
1 Send VC.

Next, another example will be described.

To obtain high fluid pressure in the bioreactor (2), the second
As shown in the figure, the bioreactor (2) is equipped with a stirrer (8).
), the organic waste liquid is supplied with a pump and oxygen-containing gas is supplied under pressure with a compressor fc), and the exhaust gas is discharged from an exhaust passage (9) with a throttle valve (), and the bioreactor is The iFE in (2) may be kept high.

[Brief explanation of drawings]

FIG. 1 shows a 70-sheet showing an embodiment of the invention, and FIG. 2 shows a 70-sheet showing another embodiment of the invention. Agent Patent Attorney: Jo Himura

Claims (1)

[Claims] Acid fermentation of the organic waste liquid is carried out in a pipe reactor under high hydraulic pressure while supplying oxygen-containing gas, and the organic acids in the acid-fermented organic waste liquid are passed through a selectively permeable membrane, and the organic acid in the organic waste liquid is transferred to the membrane through a selective permeable membrane. A method for recovering valuables from organic waste liquid while applying high liquid pressure.