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Method for representing organic matter bonding strength in sludge extracellular polymeric substance

A technology of extracellular polymers and binding strength, applied in sludge treatment, water pollutants, chemical instruments and methods, etc., can solve the lack of quantitative description of EPS binding strength, etc., and achieve the effect of easy separation and improved resolution

Active Publication Date: 2022-08-09
TONGJI UNIV
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Problems solved by technology

Many existing schemes qualitatively determine the EPS binding strength based on the "stimulus-response" of the intensity of the extraction method, which is somewhat subjective and lacks an objective and quantitative description of the EPS binding strength

Method used

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  • Method for representing organic matter bonding strength in sludge extracellular polymeric substance
  • Method for representing organic matter bonding strength in sludge extracellular polymeric substance

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Experimental program
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Embodiment 1

[0037] (1) The concentrations of STOC, TS and VS of secondary sludge were determined to be 89.95 mg / L, 3.10% and 1.41%, respectively.

[0038] (2) Wash the resin for later use. Sodium cation exchange resin (model: 001×7) was washed with ultrapure water until the supernatant was clear and colorless, soaked in 2 times the volume of HCl solution (1mol / L) for 4 hours, and washed with ultrapure water until neutral. Then soak in 2 times the volume of NaOH solution (1mol / L) for 4 hours, then wash with ultrapure water until neutral, and use a vacuum pump to suction filter the washed resin to remove gravity water and interstitial water for later use.

[0039] (3) Determination of the total capacity Q of resin-induced sludge to release extracellular organic matter. Take 300mL of secondary sludge, add pretreated 001×7 resin according to 15g / g VS and stir, the stirring speed is 500rpm, and the reaction temperature is controlled to 20℃. The STOC concentration of the sludge was measured at ...

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Abstract

The invention relates to a method for characterizing the bonding strength of organic matters in sludge extracellular polymeric substances, which comprises the following steps: measuring the total capacity Q of resin-induced sludge to release extracellular organic matters, and extracting the sludge extracellular organic matters by using washed resin in a gradient manner; and based on the capacity Q of the extracellular organic matters released by resin full exchange and the net capacity Rn of the extracellular organic matters released by nth extraction, calculating to obtain an extracellular organic matter bonding strength index In, and obtaining a table verification result based on In. Compared with the prior art, the method disclosed by the invention has the advantages that the extracellular organic matters are released by adopting a low-concentration, short-time and repeated sodium type cation exchange resin method for gradient extraction, and the binding strength index of the extracellular organic matters in the sludge is defined and calculated, so that a quantitative basis is provided for energy input and chemical addition parameters in the process of releasing the organic matters in the sludge; the energy-saving and consumption-reducing optimization of the process is facilitated, and the method has important significance on sludge organic matter recycling and carbon neutralization in the sewage treatment industry.

Description

technical field [0001] The invention relates to the field of municipal sludge treatment and organic matter resource utilization, in particular to a method for characterizing the binding strength of organic matter in extracellular polymers of sludge. Background technique [0002] Sludge is a by-product produced in the biological treatment of sewage, which enriches a large amount of organic matter, pollutants and nutrients in sewage, and has dual attributes of pollution and resources. At present, the scale of urban sewage treatment in my country exceeds 200 million tons / day, and the resulting sludge volume exceeds 60 million tons / year (calculated at a moisture content of 80%). The problem of sludge treatment and disposal has become a shortcoming in water pollution control work. [0003] Under the background of "double carbon", the positioning of sewage treatment plants has gradually shifted from reducing pollution to recycling resources and energy. Sludge rich in organic pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/30
CPCC02F11/00C02F2101/30Y02W30/62
Inventor 戴晓虎刘芮许颖朱丹阳宋梁刘诗彧
Owner TONGJI UNIV
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