Method of optimizing acid production structure through pretreatment of iron electrode activation of persulfate

Abstract

The invention discloses a method of optimizing an acid production structure in an anaerobic fermentation acid production process of excess sludge and increasing a short chain fatty acid yield throughpretreatment of iron anode and electricity combined activation of persulfate. The method comprises the steps of: taking sludge as a fermentation substrate, a single-chamber electrolytic tank as a reaction device, an iron sheet as an anode and a graphite rod as a cathode, adding the sludge into an electrochemical reaction tank, adding persulfate into the fermentation substrate at the same time, electrifying for pretreatment, adjusting an initial pH (potential of hydrogen) to 10 for anaerobic fermentation, and obtaining structure optimized short chain volatile fatty acid. The method takes the sludge of a sewage treatment plant as a raw material; an acetic acid yield can be increased to the maximum extent by controlling an iron concentration, a current magnitude, electrifying time and a persulfate concentration in a pretreatment system; and the method contributes to achieving carbon source internal circulation of the sewage treatment plant and promoting sludge reclamation utilization. Atthe same time, the method also has the advantages of simplicity in operation, convenient management and high cost performance.

Description

Technical field: [0001] The invention mainly relates to the technical field of environmental protection, and in particular to a system and method for optimizing the structure of acid production and promoting the production of volatile fatty acids by using iron electrodes to activate persulfate advanced oxidation pretreatment sludge. Background technique: [0002] Synchronous nitrogen and phosphorus removal from sewage is an important means to prevent water eutrophication, and the use of microorganisms in activated sludge to remove nitrogen and phosphorus in sewage is the most common method. However, when the microorganisms in the activated sludge system process nutrients such as nitrogen and phosphorus, they need to assimilate a large amount of organic compounds. However, in the current situation of sewage treatment in my country, due to the low content of organic matter in sewage, incomplete diversion of rain and sewage, and high precipitation in the south, the content of o...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the low production efficiency and time-consuming problem of short-chain fatty acids in the existing sludge anaerobic fermentation pretreatment technology, and to provide an iron anode combined with electroactivated persulfate advanced oxidation method to pretreat sludge The method can accelerate the cell body rupture and organic matter dissolution and promote the dissolution and hydrolysis rate, which can not only increase the production of SCFA, but also optimize the structural composition of its products

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