A pollution-free integrated method and device for recycling extracellular polymers with high added value

Abstract

The invention relates to a pollution-free integrated method and device for recycling extracellular polymers with high added value. Wherein, the method includes the following steps: step S1: transport the excess sludge to a cation exchange resin reactor, and extract extracellular polymers in the excess sludge; step S2: intercept the microbial cells and their components in the excess sludge through the microfiltration membrane module Residue, obtain the filtrate containing extracellular polymers; Step S3: Filtrate through multi-stage membrane modules, which can sequentially concentrate and purify high molecular weight extracellular polymers and low molecular weight extracellular polymers, and then separate different molecular weight range of extracellular polymers; step S4: the filtrate produced by the filtration of step S3 is transported to the forward osmosis membrane module using fertilizer as the driving agent for filtration to obtain a drawing solution containing fertilizer, which can be directly used for Water and fertilizer integrated irrigation or soilless cultivation. The invention has the characteristics of no damage to cells and no pollution.

Description

Technical field [0001] The present invention relates to a high value-added extracellular polymer recovery pollution-free integrated method and apparatus. Background [0002] Resource utilization has become an important direction and inevitable trend of future sewage treatment technology. At present, the most commonly used biological sewage treatment technology is the activated sludge method, but with it comes a large amount of residual sludge that is difficult to treat and dispose of. Taking China as an example, according to the data released by the E20 Research Institute at the end of 2018, the sludge production (80% moisture content) in 2017 was as high as 43.28 million tons / year. It is predicted that by 2020, the annual output of sludge in China will reach 50.75 million tons, so it is necessary to stabilize, harmless and resource the sludge. [0003] Extracellular polymers (Extracellular Polymeric Substances, abbreviated as EPS) is an important part of activated sludge, acco...

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Problems solved by technology

[0007] At present, traditional methods are difficult to improve the extraction rate of EPS and easily cause secondary pollution

Existing research only indiscriminately extracts EPS from sludge, and the extract contains a large amount of impurities, which is difficult to apply

The excess sludge is produced in the mixed microbial treatment system of municipal sewage. In the process of extracting EPS, most of the small molecular pollutants such as heavy metal ions and antibiotics will be transferred from the excess sludge to EPS in solid phase, which has not been seen at home and abroad so far. There are studies on the detection of toxic and harmful pollutants in recycled EPS, and it is unheard of to consider removing toxic and harmful pollutants from EPS

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