A kind of biological leaching method of purified terephthalic acid sludge

Abstract

The present invention provides a purified terephthalic acid sludge bioleaching method comprising the following steps: 11, in advance separately inoculating and domesticating a plurality of strains of acidophilic autotrophic bacteria and a plurality of strains of acid-resistant heterotrophic bacteria, and then respectively uniformly mixing the acidophilic autotrophic bacteria and the acid-resistant heterotrophic bacteria to obtain composite autotrophic bacteria and composite heterotrophic bacteria; step 12, in purified terephthalic acid sludge, inoculating the composite heterotrophic bacteria for concentrated anaerobic fermentation for 1d, then removing supernatant, and putting the obtained concentrated sludge into a reactor for bioleaching for 8-24h to obtain composite heterotrophic bacteria leaching sludge; step 13, taking a number of volumes of the composite heterotrophic bacteria leaching sludge, inoculating the composite autotrophic bacteria, meanwhile adding a bioleaching microbial nutrient, placing in a reactor for bioleaching, and filtering by pressing for dewatering; and step 14, taking composite autotrophic bacteria leaching sludge as autotrophic bacteria for re-inoculation, taking the composite heterotrophic bacteria leaching sludge as heterotrophic bacteria for re-inoculation, and returning to the step 12 and 13 for bioleaching of next batch of sludge.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a biological leaching method of purified terephthalic acid sludge. Background technique [0002] PTA (Pure Terephthalic Acid, PTA) is the most important raw material for the production of polyester, and enterprises producing PTA will produce a large amount of PTA sludge in the treatment of production wastewater. According to the field investigation of several PTA production enterprises, this kind of PTA wastewater is mostly treated by ordinary activated sludge method, and the secondary sedimentation sludge is directly added with polyacrylamide (PAM) and then dewatered by belt or centrifuge. The main characteristics of this type of dewatered sludge are that the organic matter content on a dry basis is above 85%, and the moisture content is close to 90%. The cost of direct incineration is high. Therefore, it is very important to try to dehydrate the sludge in depth for subs...

AI Technical Summary

Problems solved by technology

However, when bioleaching is used to treat PTA sludge, the extremely acidic environment (pH=2.0-2.5) of the returning sludge makes the acid-resistant heterotrophic bacteria in the bioleaching composite microbial flora unable to fully play the role of degrading DOM. The activity of acidic autotrophic bacteria is inhibited by DOM, which shows that the time required for bioleaching of PTA sludge is relatively prolonged and the dehydration effect is deteriorated.

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