Method for treating wastewater through absorption method

The invention discloses a method for treating wastewater through an absorption method. The wastewater is treated by pouring a composite powder adsorbent into a wastewater body. The composite powder adsorbent comprises uniformly mixed powder activated carbon and microorganism; the weight ratio of the powder activated carbon to the microorganism is 1:(3.0-9.0); the pouring amount of the composite powder adsorbent in the water body is 0.3-1.5kg/m ; and the treatment time is controlled to be 20-120min. Compared with the method that pure powder activated carbon or microorganism is used as the absorbent, the method has the advantages that the operation cost is greatly lowered, the dispersion property of the absorbent in the water body is improved, and the absorbent shows good elimination effect on the amine and the nitrogen, so that the method is particularly suitable for being used in match with an activated sludge method process.