A common practice in the production of activated carbon is post washing the material with water or acids to remove impurities. Now in an industrial scale that is a lot of wastewater to deal with.
My question is how it is dealt with.
Carbon and other adsorbents in various forms have been used for the treatment of water and as detoxifying pharmaceutical agents in medicine for many centuries. There has been an uninterrupted use of carbonaceous adsorbents since biblical times (Old Testament, Num. 19:9; Maimonides, 1185) and there have been marked changes in the nature of the adsorbent since that time (Kunin, 1974a,b).
During the twentieth century, GAC and powdered activated carbon (PAC) have been used in the United States to control taste and odors in drinking water (U.S. Environmental Protection Agency, 1978a). During the past 20 yr, research on the use of adsorbents to treat drinking water has emphasized the removal of specific organics. The removal of organic compounds from drinking water has been based primarily on the measurement of organic matter as measured by carbon chloroform extract (CCE), total organic carbon (TOC), or other group parameters. However, it has long been recognized that these group parameters provide only estimates of performance for target compounds. Studies beginning with those of Middleton and Rosen (1956) began to identify the specific organic compounds in drinking water and their removal by the carbon adsorption.
You have to add another sequence of treatment for the dirty liquid like filtration.
This dirty liquid can be treated by filtration or any combined methods to be reused again.
Depending on the composition of the AC wastewater, biological treatment may be applied after proper pretreatment (solids, ...) and conditioning (pH, nutrients, ...).
The waste water should go through the Slugde separation firts and sent to the conventional waste water treatment plant for purification while the accumulated sludge can be used as sand bed
If material do not have very high salt content and the same time your need irrigation you can apply. Did waste waters contain pthogen? If the yhave deseases potentioal waters can only be treated with microbe killing solutions.
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