Attapulgite adsorbent for treating COD in wastewater and preparing method

Abstract

The invention belongs to the technical field of an attapulgite adsorbent for treating COD in wastewater and a preparing method. The attapulgite adsorbent for treating the COD in the wastewater is prepared from, by weight, 70-85 parts of modified attapulgite, 15-20 parts of aluminum oxide and 5-10 parts of cross-linking agent. The attapulgite adsorbent for treating the COD in the wastewater is prepared by modifying attapulgite, adding the cross-linking agent and aluminum oxide and conducting heat treatment. The attapulgite adsorbent for treating the COD in the wastewater is simple in technology, low in cost and remarkable in COD treatment effect, the removal rate is up to 85% or above, and the discharge concentration after treatment is lower than a state-specified first grade discharge standard.

Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an attapulgite adsorbent for treating COD in waste water and a preparation method thereof. Background technique

[0002] A large amount of waste liquid and waste water of dry film, wet film and ink will be produced in the process of film backing, developing and screen printing in the manufacture of printed boards. It contains a large amount of polymers, organic amines and alkalis. It is a kind of High-concentration organic wastewater, the wastewater is blue, and its chemical oxygen demand (COD) value is usually 5000-10000mg / L, and some are as high as 20000mg / L. This type of wastewater accounts for about 5% of the total water volume of printed board wastewater . However, the COD contribution to the total wastewater is as high as 80%. According to the national wastewater discharge standard, the COD value in wastewater must be <100mg / L. Therefore, the qual...