Sludge anoxic and intensified fermentative hydrolysis of multi-format a 2 oSystem and its application

Abstract

The invention provides a multi-cell A<2>O system of sludge anoxic and strengthened fermentation hydrolysis. The system comprises a sludge anoxic cell, a strengthened fermentation hydrolysis cell, an anoxic cell, an aerobic cell and a secondary sedimentation tank, wherein a water inlet pipe is connected with the sludge anoxic cell; the aerobic cell is connected with the anoxic cell through an internal reflux pipeline; and 2 or 3 strengthened fermentation hydrolysis cells, 2 or 3 anoxic cells and 2-4 aerobic cells are provided. By adopting the system provided by the invention, the sludge of the sludge anoxic cell is denitrified through endogenous respiration, and the internal carbon source in sludge is fully used so that more carbon sources are applied to a nitrogen and phosphorus removal biological reaction of the mainstream AAO technology; the nitrate content of the sludge anoxic cell can be reduced to 0, the redox potential in the strengthened fermentation hydrolysis cell is very low, and the effect of anaerobic phosphorus release is improved; and meanwhile, hydrolysis fermentation is performed through a high-concentration sludge layer in the strengthened fermentation hydrolysis cell, macromolecular or refractory organic substances in the inflow water are converted into low-molecular-weight fatty acid, and a high-quality carbon source is provided for the anaerobic phosphorus release and anoxic denitrification reactions.

Description

technical field [0001] The invention relates to a multi-format A of sludge anoxic-enhanced fermentation hydrolysis 2 The O process belongs to the technical field of sewage treatment. Background technique [0002] A 2 The O process is an existing process for simultaneously removing nitrogen and phosphorus. The advantage of this process is that the process flow is simple, but there are also inherent defects, mainly in the organic load, sludge age, etc. There are contradictions and competitions in the demand for carbon sources and carbon sources, and it is difficult to obtain efficient removal of nitrogen and phosphorus in the same system at the same time. [0003] Traditional A 2 The return sludge from the secondary settling tank of O process enters A at a ratio of 100%. 2 In the anaerobic section of the O pool, a large amount of nitrate and a small amount of DO (dissolved oxygen, dissolved oxygen) carried in the return sludge enter the anaerobic section. However, only wh...

AI Technical Summary

Problems solved by technology

However, the carbon source content of many urban sewage is low, and there are many macromolecular organic matter or non-degradable organic matter in the carbon source, which cannot meet the needs of nitrogen and phosphorus removal for high-quality carbon sources.

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