Study On Recycling The Waste Kieselguhr In Beer Industry

Kieselguhr is a kind of mine. It's mostly consist of SiO2, and it also contains a small quantity of Al2O3,Fe2O3,CaO,MgO,K2O,Na2O,P2O5, as well as organic matter. There are many micropores on kieselguhr's hull, so the kieselguhr has a little bulk density and a large specific surface area. It has a strong ability in adsorbability and filtration, it can also absorb a great deal of colloid grain.High quality kieselguhr always used in madding filter aids, and 2/3 of the kieselguhr filter aids are used in beverage industry (beer, wine, juice industry, etc.). In the beer filtration, kieselguhr's surface absorbs many organic matters in beer. The function of the filter aiding slows down gradually. And finally, the kieselguhr can not be used in filtration any more, so we have to abandon it.The waste kieselguhr contains many organic matters, such as microzyme and protein, so we can't derectly pull it into downcomer, or pile up out of doors. If the yeast fermens, organic matters will decompose and bring malodor. It will pollute the environment, and world health organization also indicate that if you inbreathe the kieselguhr powder during a long time, you may fall ill in pulmonary disease. Recently we mostly dispose the waste kieselguhr by buring it underground. Not only if this way take up a lot of ground, but also kieselguhr is a sort of natural resource which can not be recycled. So do the reseatch on recycling of used kieselguhr from beer filters has a important signification.This paper discussed how to do the recycling of used kieselguhr from beer filters in laboratory, how to separate the organic matters away from the waste kieselguhr. The study successfully divided yeast and protein from the waste kieselguhr. So the kieselguhr got back it's ability of filter aiding, and can be used in filtration again. From what had been done, we can draw the conclusions as following:1. The waste kieselguhr contains a large quantity of organic matters. The weight loss on ignition is up to 17.49%, exceed the nation's standard, which regulates The weight loss on ignition should not be more than 2%.2. Using single physical method, such as low-speed centrifugally sedimentation, and low- frequency ultrasonic, to deal with the waste kieselguhr. Organic matters can't be wiped off efficiently by these means. If we use single chemical to retexture the waste kieselguhr, when NaOH's concentration came to 1%. Organic matters can be removed more efficiently. The weight loss on ignition of the dealed kieselguhr is 2.64%. It's close to the nation's standard. When the NaClO's concentration reached to 0.6%, it also had some effect on waste kieselguhr's regeneration. HCl did little effect on the recycle.3. By integration experimentation, found out the organic matters can be entirely removed, if we add NaClO into waste kieselguhr first, and then add NaOH into it. When NaClO's concentration is 0.5%, wastage is 150ml, NaOH's concentration is 0.8%, watage is 200ml, organic matters can be removed better.4. Testing the recycled kieselguhr, water solution substance, acid solution substance, pH value are all according with the nation's standard. At the same time, the speed of the filtration advanced. So the recycled kieselguhr can be used to instead of the new kieselguhr.5. For the sample of the waste kieselguhr contains 2 types, after the dealing of regeneration, we should to classificate it according to the grain's granularity before the recycled granularity used in filtration again.Only a few indexes were applied to estimate if the waste kieselguhr had been regenerated because of the limitation of time and lab conditions. Considering of filter aids's practice, penetration, grain size distribution, nephelometry also can be used to extimate the waste kieselguhr's regeneration. Secondly, the recycling method discussed in this paper, can be carried out by circle. But too many times operation maybe affect the kieselguhr's performance, and affect its use value and economic value. This is the problem should be investigatede further.Finally, this study is carried in laboratory, if we want to apply it into practice, we should design related tester, simulate the manufacture process, do the further research.