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Luke Bailey
Luke Bailey

PilotStep Up: High Water : Season 1 Episode 1

Downstream processing can take any one of several different forms, depending on where the desired product is. If the microbe itself is the product, the microbial paste can be freeze dried, much like coffee, and later added to a solution so that it revives and begins to perform its material-making function. It can be baked at high temperature and turned into a powder that then can be turned into pellets to be used as a filtration material in gas masks or turned into a sprayable decontamination powder for surfaces, or it can be woven into long fibers to form textiles that will neutralize chemical agents on contact. Or the microbes can be rendered into a dry spray much like powdered milk or baby formula that is made functional by placing it in water and heated. If the desired product is inside the microbe, they can be smashed open and turned into a liquid. The product can be extracted from liquidified microbes or from the broth itself using various filters or solvents.

PilotStep Up: High Water : Season 1 Episode 1

This is necessary because of the limits to its current production capabilities. Many chemicals generated through biomanufacturing in a watery microbial growth medium are very difficult to remove from the fermentation broth, or are insoluble in water. They have to be extracted using chemical rather than mechanical methods. This will broaden the range of high value chemicals that the Center can manufacture.

Two CAC-based SHCC mixtures consist of ISTRA 40 Calcium aluminate cement (CAC), ground granulated blast furnace slag (GGBFS), fine silica river sand, water, Polycarboxylate based high range water reducer admixture (HRWRA), Hydroxypropyl Methylcellulose, and high molecular weight polyethylene (PE) fibres. The addition of GGBS could restrain the conversion of CAC. A referenced OPC-based SHCC mixture was also prepared. The chemical composition of cementitious materials (see Table 1) was examined by X-ray fluorescence (XRF). The fine aggregate used in this study was silica sand with a maximum grain size of 181 µm and an average size of 100 µm. The particle size distribution of each material is shown in Fig. 1. The basic properties of OPC and CAC are given in Table 2, and their surface morphology is shown in Fig. 2.

Polycarboxylate-based (PCE) high-range water-reducing admixture (HRWRA) was used to achieve desirable workability of fresh mixtures, and hydroxypropyl methylcellulose (HMPC) was added as a viscosity modifying admixture to ensure uniformity of the PE fibre dispersion. 041b061a72


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