JPS60150884A - Method for recovering valuable material from organic waste liquid - Google Patents

Abstract

PURPOSE:To reduce the time and equipment, and to treat practically the organic waste liquid by acid-fermenting the organic waste liquid in a bioreactor, and recovering organic acids with membrane separation. CONSTITUTION:The high-concn. organic waste liquid such as the waste liquid from food is supplied into an immobilized bioreactor 2 from a supply passage 1, and the organic acids such as acetic acid, propionic acid, and butyric acid are formed in the bioreactor 2 from the organic materials in the waste liquid with the acid fermentation by bacteria immobilized on a carrier. The liquid is then sent through a pipeline 3 equipped with a pump into a membrane separator 4 wherein the organic acids are recovered, and the recovered organic acids are sent to a recovery passage 5. The membrane separation is sufficiently carried out, and the organic acids are recovered.

Description

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

Conventionally, organic waste liquid was subjected to acid fermentation in a bioreactor and then supplied to a methane fermentation tank, and almost all of the organic acid in the waste liquid was converted into methane bacteria and converted into methane gas as a valuable product.
Does methane fermentation take an extremely long time and a vast area?
There were some drawbacks.

An object of the first invention is to greatly reduce the time and site required for collecting valuables compared to the conventional method.

The characteristic means of the method for recovering valuables from organic waste liquid according to the first invention is that organic acids are recovered by membrane separation from the organic waste liquid that has been subjected to acid fermentation in a bioreactor. Instead of fermentation, organic acids can be recovered as valuable substances through membrane separation, making it possible to process them in about 1 hour.

As a result, the time and site required for organic waste liquid treatment can be greatly reduced, and organic waste liquid treatment can now be practically carried out even in areas where land prices tend to be difficult to secure, such as in urban areas where land prices are soaring.

An object of the second invention is to improve the method for recovering valuables from organic waste liquid according to the first invention, so that the efficiency of recovering valuables can be further improved.

The characteristic means of the method for recovering cargo from organic waste liquid according to the second aspect of the present invention is to recover organic acid by membrane separation from the organic waste liquid acid-fermented in a bioreactor, and to transfer the organic waste liquid after the membrane separation treatment to the bioreactor. Its functions and effects are as follows.

In addition to reducing the time and site required for treatment by collecting organic acids through thinning and membrane separation, organic acid recovery during membrane separation can also be used to circulate and supply organic waste liquid to the bioreactor after membrane separation treatment VcJ: t) It can be done at a high rate of 9gJ. More specifically, in membrane separation, when the organic acid concentration of the organic waste liquid decreases to a certain extent, the amount of organic acid that permeates through the membrane per hour becomes extremely small, and it is necessary to sufficiently recover the organic acid with seven membrane separation treatments. The membrane separation process takes a long time. However, if the waste liquid after membrane separation treatment is circulated and supplied to the bioreactor, undecomposed organic matter is decomposed and membrane separation can be performed at all times with a high concentration of organic acids, and unrecovered organic acids can be recycled again. It can be recovered by membrane separation treatment, and therefore membrane separation can be extremely efficient and organic acids can be recovered sufficiently.

Next, an embodiment is shown in the drawings.

Food waste liquid and other high-concentration organic waste e are supplied from the supply path (1) to the immobilization bioreactor (2). Organic acids such as acetic acid, propionic acid, and butyric acid are produced from organic matter.

The organic waste liquid subjected to acid fermentation in the bioreactor (2) is supplied to the membrane separation device (4) through a pipe with a pump (3), and in the membrane separation device (4), it is separated using a reverse osmosis membrane, an ion exchange membrane, etc. The organic acid is recovered by the organic acid selective permeation effect by the membrane (4@) (the diagram shows the case of a reverse osmosis membrane), and the organic acid is sent to the recovery channel (5).

Most of the membrane-separated waste liquid is supplied to the bioreactor (2) through the circulation path (6), and the remaining NS is sent to the waste liquid treatment equipment (8) through the discharge path (7).

Next, another example will be described.

In the case of the first invention, the entire amount of organic waste liquid from the membrane separation device (4) is sent to the waste liquid treatment facility (8).

In the case of this J1 and the second invention, in order to completely recover the organic acid from the organic waste liquid, after extracting the organic acid from the organic waste liquid into an extract liquid,
An indirect method of recovering organic acids through membrane separation of the extract can also be used.

[Brief explanation of the drawing]

The drawing is a 70-sheet illustrating the entire method of the invention. Agent Patent Attorney Osamu Kitamura Continuation of page 1 ■Inventor Toriyama Inventor Toriyama Eisuke 1-2-47 Shikitsu Higashi, Naniwa-ku, Osaka Inside Kubota Tekko Co., Ltd.

Claims (1)

[Scope of Claims] ■ A method for recovering valuables from organic waste liquid, which recovers organic acids by membrane separation from organic waste liquid subjected to acid fermentation in a bioreactor. (2) A method for recovering valuables from an organic waste solution, which involves recovering an organic acid from an organic waste solution subjected to acid fermentation in a bioreactor through membrane separation, and circulating and supplying the organic waste solution after the membrane separation treatment to the bioreactor.