Tannic acid number of different shell activated carbon water purification is different, Table 1 shows some typical activated carbon adsorption properties abroad, and expressed its phenol values ??are: Requires shell activated carbon concentration in g / L is calculated, so that the standard phenol solution From Table 1, the concentration of 200mg of activated carbon adsorption properties of different types of foreign .2.2 tannic acid value determination method and standard-setting shell activated carbon in the export process, foreign investors are often made tannic acid value measured (estimated for water treatment), but there is no standard method for the determination of domestic tannic acid value, it is necessary to make a determination of the acid value of orders Ning. The reason according to the Forest Research Institute of Chemical Industry standard tannic acid value assumed Determination formulation. Determination of acid made orders rather standard American Water Works Association, the main reference standard powdered activated carbon ANSL / AWWA B 600, then modify (by a combination of single blender to blender) according to the forest of the experimental conditions. Modify the calculation method, based on 弗伦德利希 adsorption isotherm equation. Tannic acid on a carbon adsorption experiments, the method used to calculate the AWWA tannic acid value of 360mg / L, calculated using the above correction method tannic acid value of 350mg / L. The standard is currently being solicited comments reported widely implemented after the approval of higher authorities. Ozone, coconut shell activated carbon treatment, coconut shell activated carbon regeneration is not carried out for six consecutive years continuously processed wood powdered activated carbon to remove the results of trihalomethane precursors clear. In such a long period of time, can stably remove 60% -80% of the original water THM precursor substances. When only coconut shell activated carbon treatment time increased later, can remove about 20% of trihalomethane precursors. The results indicate that even can be considered within the coconut shell activated carbon adsorption capacity has been reduced as a long period of use in biological coconut shell activated carbon treatment, through the action of biological make coconut shell activated carbon can be used long-term. On the other hand, Kim et al., Reports that shell activated carbon, even in the right humins like naturally occurring organic matter has penetrated the biological coconut shell activated carbon, and can be removed completely by adsorption 24 hours of continuous inflows Australia on behalf of the phenol. Even long-term use biological activated carbon of coconut shell activated carbon, for the waterways is problematic in terms of the extent that the trace organic compounds, like still maintain a certain degree of adsorption capacity. It follows that biological pesticides like coconut shell activated carbon to remove organic compounds are effective long-term. And, reportedly, on the variation of the original precursors also have long-term effects of continuous removal. Columnar activated carbon | Song Xin columnar activated carbon filter (certified) | charcoal provided by Gongyi City Song Xin Industrial Co. filter. Gongyi City Song Xin Industrial Co. filter (www.sxlc.com) is Zhengzhou, cleaning, cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Song Xin filter in leadership with the staff warmly welcome all inquiries negotiations to create Song Xin filter a better future.