The most representative adsorbent is activated carbon adsorption is quite good

Using multiple adsorption column effluent oil content according to the level of a series of sewage treatment,molecular sieve adsorbent oil content in the effluent monitoring at, if the water quality  molecular sieve adsorbent  is not up to then enter the circulatory system to continue processing until the compliance date. If oily wastewater COD, emulsion content is higher, before entering into the first reactor COD removal device and emulsion and dissolved substances such  regeneration of molecular sieves  as pretreatment removal device.
The most representative adsorbent is activated carbon adsorption performance is quite good, but the cost is relatively high, the event has been applied in the Songhua River water for adsorption of toluene. Then there zeolite, silica gel, activated aluminum, polymer adsorbent and biological adsorbents, etc.