Device and method for strengthening sludge digestion and synchronously denitrifying and dephosphorizing

Abstract

The invention relates to a device and a method for strengthening sludge digestion and synchronously denitrifying and dephosphorizing, and belongs to the technical field of low-carbon-nitrogen-ratio (C / N) and high-concentration ammonia nitrogen wastewater biological denitrification. The device is provided with a raw water tank, an A-O (anaerobic-oxic) reactor, a sedimentation tank, a sludge fermentation, coupling and denitrification synchronization autotrophic denitrification (SFDANR) reactor and a sludge storage tank, wherein the raw water tank is connected with the A-O reactor by a raw water inlet pump; a water outlet of the sedimentation tank is connected with the SFDANR reactor by a water outlet pump; and the SFDANR reactor is provided with a self-circulation pipeline. The method comprises the following steps of starting the A-O reactor, starting the SFDANR reactor, and allowing the A-O reactor and the SFDANR reactor to run in series. The device and the method are suitable for deep denitrification and dephosphorization of high ammonia nitrogen domestic sewage and a sludge digestion solution; a technology is advanced; a sludge yield is reduced effectively; and energy saving and consumption reduction advantages are obvious.

Description

technical field [0001] The invention relates to a device and method for strengthening sludge digestion and synchronously removing nitrogen and phosphorus, and belongs to the technical field of biochemical sewage sludge treatment. The ammonia nitrogen released by sludge fermentation and the nitrite produced by short-range nitrification are removed by anaerobic ammonium oxidation, and the denitrifying bacteria use the volatile organic acids produced by hydrolysis and acidification as electron donors to denitrify the produced nitrate nitrogen to reach total nitrogen Deep removal and effective utilization of sludge. This technology is suitable for the enhanced denitrification and dephosphorization of sewage with low C / N ratio and C / P ratio and the initial reduction and stabilization of sludge. Background technique [0002] In the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) promulgated in 2002 by our country, the first-level A standard requir...

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Problems solved by technology

The use of fermentation-elaching process has the following disadvantages in practical application: due to the adsorption of sludge, the separation of mud and water is difficult, the VFA produced by fermentation is difficult to be elutriated, and a higher elutriation efficiency is required. The amount of elutriation water; it is difficult to avoid the occurrence of methanogenic reaction in a complete anaerobic reactor, and the hydrolysis of particulate matter is the rate-limiting step of sludge anaerobic fermentation, so the fermentation product is consumed by methanogenic bacteria in large quantities; in order to achieve a higher elutriation The washing efficiency requires a large amount of elutriation water, which will inevitably produce a large ascending flow rate, which will bring out a lot of particulate matter, thereby increasing the solid load of the subsequent processing unit.

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