Method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation

Abstract

The invention discloses a method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation, relates to the coupling control technology of sludge fermentation enhanced nitrogen and phosphorus removal technology and sludge fermentation technology, and belongs to the fields of urban sewage treatment and sludge biochemical treatment. The method employs a sequencing batch reactor to couple the sludge fermentation effect and the urban sewage nitrogen and phosphorus removal effect into a same system, so that easily degradable carbon source generated by sewage fermentation can be consumed timely by phosphorus-accumulating bacterium and denitrifying bacterium, the nitrogen removal effect of the urban sewage with a low C / N ratio is enhanced, the problem of lowered fermentation reacting rate caused by accumulation of products in the fermentation process is avoided, and the initial stabilization of primary sludge is achieved at the same time. The method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation is applicable to the enhanced nitrogen and phosphorus removal of the urban sewage with low C / N ratio and C / P ratio and the initial decrement and stabilization of the sludge. The method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation is saving in carbon source and improved in nitrogen removal efficiency, and has the advantages of simple equipment, flexible operation, high nitrogen removal efficiency and the like.

Description

technical field [0001] The invention relates to a coupling control technology of an enhanced denitrification and phosphorus removal process of urban sewage and a sludge fermentation technology, and belongs to the fields of urban sewage treatment and sludge biochemical treatment. The process is suitable for the enhanced denitrification and dephosphorization of urban sewage with low C / N ratio and C / P ratio and the initial reduction and stabilization of sludge. Background technique [0002] my country's "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) promulgated in 2002 requires that the effluent water quality of all sewage units should be less than 50mg / L for COD, less than 5mg / L for ammonia nitrogen, less than 15mg / L for total nitrogen, and less than 15mg / L for total phosphorus. Less than 0.5mg / L (level A standard). COD emissions have been effectively controlled during the Eleventh Five-Year Plan period, but the issue of nitrogen and phosphorus emis...

AI Technical Summary

Problems solved by technology

In actual engineering, if the fermentation-elution process is used to develop the composite carbon source in the sludge, there are some disadvantages: 1) Due to the adsorption of the sludge, the VFA produced by fermentation is difficult to be elutriated, and a higher However, the elutriation efficiency requires a large amount of elutriation water, and the elutriation efficiency is low, and the separation of mud and water is difficult; 2) it is difficult to avoid the occurrence of methane reaction in a completely anaerobic reactor, and the hydrolysis of particulate matter is a key factor for sludge anaerobic The rate-limiting step of aerobic fermentation, so the fermentation product is consumed by methanogens in large quantities; 3) In order to achieve high elutriation efficiency, a large amount of elutriation water is required, which will inevitably produce a large upward flow rate and bring out a lot of particulate matter , increasing the solid load of the subsequent processing unit

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