While extraction of water with a floppy tea bag is a known technique in the environmental field, we have modified this method by developing a rigidified, flattened bag. The bag then can be operated in two general ways. In the first, the bag is connected via a shaft to a stirring motor, giving a stirring bag in the water of interest. A relatively high speed of stirring can be applied. In the second way, the bag is stationary and the flow of water through it is driven by some other flow process. Recirculation of the water through the bag is an important feature of each strategy, enhancing speed and completeness of extraction along with efficient use of the adsorbent. Three kinds of bag material have been studied to date: porous nylon, stainless steel cloth, and paper. Extraction speed for the stirring bag has been increased by changing the angle and tilt of the bag. For groundwater samples, the technique is currently being used to extract impurities for analysis. It is found to be convenient for this purpose. Resistance to clogging by particulates is anticipated. Scale-up of the method for remediation of groundwater is conceivable, e.g. with a 1 m<sup>2</sup> bag. The technology also is being tested as a device for purification of drinking water for the consumer in the home. Overall potential economic advantages of the technology are low cost, efficient use of adsorbent, green technology, speed, degree of purification, and simplicity.<br/>

Extractive tea bag for water sampling and cleanup

254th National Meeting (2017)

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