The New Industry Research Organization / Regional Innovation Promotion Department
In this program, the research group of Univ. of Hyogo has been developing new adsorbents and bioflocculant for the pretreatment of water treatment and water supply using advanced membranes. Based on the results obtained during the previous research period (2012-2016), we promote the improvement of the adsorption efficiency of the titanosilicate adsorbents for cesium and strontium, their production from metal wastes, and the large-scale production for the future commercial production in the extended research period. We also focus on the large-scale production and recovery of a chitosan-like bacterial flocculant for the future commercial production. For the purpose, we improve the productivity at cell levels and also try the production from organic wastewaters. In addition, we carry out on site experiments using the developed adsorbents and bioflocculant to develop the removal process of radioactive cesium and strontium from soils and wastewaters contaminated with them.
◎Development and production of the adsorbent which utilizes cheap inorganic scrap wood
We develop the adsorbents which adsorb cesium, strontium, cadmium, etc. swiftly and effectively with an easy synthetic method by being made out of waste materials, such as oystershells or dirt generated from water-purifying.
◎Production of the bio-flocculant from waste honeydew and waste organic acid
We use liquid waste made out of organic materials, such as waste honeydew or waste organic acid as substrate, to produce the bio-flocculant of a polysaccharide system by fermentation of microbes. A bio-flocculant has biodegradability and can contribute not only to processing the drainage but also to manufacturing i.e. drinking water, by a save and good-for health flocculant.
◎Development and production of adsorbents for cesium and strontium (Cs/St) from cheap inorganic materials and wastes
We had developed a new tobermorite adsorbent for the efficient Cs/St removal from oyster shells and inorganic wastes as starting materials. We improve the adsorption efficiency by optimizing the synthetic conditions and the composition of the raw materials. We also develop a new titanosilicate adsorbent, which is efficient for the adsorption of both cesium and strontium, by a simple dry-gel conversion method (DGC method). For the commercial production, a collaborative company is trying the large-scale production with us.
◎Production of the chitosan-like bioflocculant from organic wastewaters (glucose or organic acids containing wastewaters)
Through this program research, it was found that the chitosan-like bioflocculant of Citrobacter strains was very effective for the flocculation and precipitation of soil particles and colloidal materials in suspended soil suspension. Thus, to improve the production, we try to improve the productivity at cell levels by metabolic engineering techniques and by optimizing the fermentation conditions. We also try to develop the low-energy recovery/ concentration system of the bioflocculant using hollow fiber membranes.
◎On site experiments using the tobermorite adsorbent and the bioflocculant for the removal of radioactive Cs/St from the soil contaminated with them
We develop the removal process of radioactive Cs/St from soils and wastewaters contaminated with them using the developed adsorbent and bioflocculant through on site experiments.