Sk Innovation Co., Ltd.

Korea Atomic Energy Research Institute

Sk Energy Co., Ltd.

Seung Yeop Lee

Jae Yeon Park

Min Su Koo

Joong Min Park

Woo Chan Park

Sin Young Kang

Dong Hyun Kim

Jae Wook Ryu

Kyung Su Kim

Ji Young Lee

Jae Kwang Lee

Joon Sik Lee

Eun Hee Park

Young Hwan Chu

Min Hoon Baik

Jong Tae Jeong

Hyo Jin Seo

Mineralogical method and apparatus for removal of cesium ion in aqueous solution are provided. In particular, a mineralogical method for removal of cesium ion in aqueous solution including controlling a temperature of radioactive wastewater containing cesium from 25 to 45&#xb0; C., controlling an initial pH of the radioactive wastewater from 6.0 to 8.5, and adding iron(II) and sulfide(&#x2212;II) containing sulfur in the &#x2212;2 oxidation state to the radioactive wastewater, to convert the cesium ion in aqueous solution into a cesium mineral, and a mineralogical apparatus for removal of cesium ion in aqueous solution, capable of being applied to such a method, are provided.

Mineralogical method and apparatus for removal of aqueous cesium ion

The present invention provides a fed-batch culture method comprising a step of fed-batch-feeding a carbon source base and a base in such a manner that the pH level can be maintained at a level suitable for the growth of microorganisms for fermentation of a carbon source. The present invention also provides a method for preparing organic acids using the fed-batch culture method. The present invention fed-batch-feeds a neutralizing agent such as ammonium bicarbonate, ammonium carbonate or alkali metal-containing weak base, and a carbon source substrate in preparing organic acids by microorganism fermentation. Thus, a pH level suitable for the survival of microorganisms for carbon source fermentation can be maintained, and the speed of injecting the carbon source base which is the source material can be appropriately adjusted. The present invention may improve productivity, yield rate and concentration of organic acids and may automatically inject a base and a carbon source substrate according to a variation in the pH level, thus improving reliability and convenience of a fermentation process operation.

Method for preparing organic acid by fed-batch-feeding carbon source substrate and base

Provided are a mineralizing removal method and apparatus for highly concentrated iodine in radioactive wastewater. According to the present invention, since only a small amount of sludge is discharged as compared to the previous treatment methods, a generation amount of the radioactive waste may be significantly decreased, such that wastewater containing highly or ultra-highly concentrated iodine may also be effectively treated. Further, only iodine may be selectively removed regardless of the presence of competitive anions in the wastewater. Treatment may be performed under a neutral or weak alkaline condition rather than an acidic condition, such that a volatilization of radioactive iodine was fundamentally blocked, and at the time of discharging the wastewater, a neutralization treatment process is not required. In addition, long term storage stability of radioactive waste may be significantly promoted by using phase-conversion of malachite and an iodine crystallization method as compared to the previous adsorption methods.

Mineralogical removal method and apparatus for highly concentrated iodine in radioactive wastewater

Disclosed is a method of preparing alkyl butyrate, which comprises: (a) producing a fermented liquid containing butyrate salt through a fermentation process using butyric acid-producing strains; (b) obtaining an extracted liquid containing butyric acid from a continuous extracting apparatus using an extraction solvent, after converting the butyrate salt into butyric acid by adding an inorganic acid except for carbonic acid or carbon dioxide into the fermented liquid, wherein the continuous extracting apparatus includes a plurality of extraction plates which are installed inside an extraction column and perform a reciprocating motion vertically, and the broth and the extraction solvent are supplied to upper and lower portions of the column, respectively; and (c) reacting the extracted liquid and alcohol having a carbon number of 4 or less or a mixture thereof in an esterification reactor to convert a resultant product into alkyl butyrate. According to the present invention, butyric acid existing in microbic culture fluid can be efficiently extracted, and furthermore, competitively priced alkyl butyrate can be prepared without an additional process of separating the extracted solvent while minimizing energy consumption.

Method of preparing alkyl butyrate from fermented liquid using microorganisms

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Daejeon, South Korea

Seung Yeop Lee