Pollution-free integrated method and device for high-added-value extracellular polymeric substance recovery

An extracellular polymer and high value-added technology, applied in chemical instruments and methods, water pollutants, plastic recycling, etc., can solve the problems of difficulty in improving EPS extraction rate, secondary pollution, and difficult application, and achieve enhanced EPS extraction rate effect

CN111847692AActive Publication Date: 2020-10-30BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-10-30

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Abstract

The invention relates to a pollution-free integrated method and device for high-added-value extracellular polymeric substance recovery. The method comprises the following steps: S1, conveying excess sludge into a cation exchange resin reactor, and extracting extracellular polymeric substances in the excess sludge, S2, intercepting microbial cells and residues thereof in the excess sludge through amicro-filtration membrane assembly to obtain filtrate containing extracellular polymeric substances, S3, filtering through a multistage membrane assembly, so that the high molecular weight extracellular polymeric substance and the low molecular weight extracellular polymeric substance can be concentrated and purified in sequence, and then the extracellular polymeric substances in different molecular weight ranges are separated out, and S4, conveying the filtrate generated in the step S3 to a forward osmosis membrane assembly taking a fertilizer as a driving agent for filtering to obtain a drawing solution containing the fertilizer, and the drawing solution can be directly used for water and fertilizer integrated irrigation or soilless culture. The method has the characteristics of no celldamage and no pollution.
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Description

technical field

[0001] The invention relates to a pollution-free integrated method and device for recycling extracellular polymers with high added value. Background technique

[0002] Recycling 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 it is followed by 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 output (with a moisture content of 80%) reached 43.28 million tons per year in 2017. It is predicted that by 2020, my country's annual sludge output will reach 50.75 million tons, so it is necessary to stabilize, harmless and recycle sludge.

[0003] Extracellular Polymeric Substances (EPS) is an important part of activated sludge, accounting for about 10% to 40% of the d...

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Embodiment Construction

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Figure to Figure 1 to Figure 2 Shown: a kind of high value-added extracellular polymer recovery non-pollution integrated method that the embodiment of the present invention provides, it comprises the following steps:

[0036] Step S1: transport the excess sludge to the cation exchange resin reactor 1, and optimize the extraction of extracellular polymers through the surfactant-enhanced cation exchange resin method, so that a large amount of extracellular polymers are dissolved in water;

[0037] Step S2: the sludge containing a large amount of dissolved extracellular polymer obtained in step S1 enters the microfiltration membrane module 2 for separation treatment, and the separated suspended matter is discharged to obtain the dissolved extracellular polymer filtrate;

[0038] Step S3: Transport the extracellular polymer solution obtained...