An up-flow hydrolysis aerobic denitrification process for high ammonia nitrogen wastewater with poor biodegradability

Abstract

The invention discloses an up-flow hydrolysis aerobic denitrification process for high-ammonia nitrogen wastewater with poor biodegradability. An up-flow anoxic section includes a hydrolysis denitrification granular sludge zone, a bio-filler mixed flocculent sludge zone and a bio-film zone which are arranged from bottom to top, and after raw water and a nitrification solution which is obtained through reflux from an aerobic section are mixed, the obtained mixture is introduced from the bottom into the anoxic section module so as to improve the nitrogen removal efficiency through the synergistic effect of hydrolysis acidification and denitrification; and a plug-flow aerobic section includes a sedimentation tank and a sludge reflux system, the effluent, which is obtained through denitrification, of the anoxic section is introduced into the plug-flow aerobic section for deamination treatment, and the remaining sludge which is precipitated is returned to the aerobic section and the anoxicsection at a ratio so as to achieve sludge reduction. The process is particularly suitable for sewage and wastewater which contain high content of ammonia nitrogen and a large amount of hardly-biodegradable organic matter, and has the characteristics of a good treatment effect, simple operation, impact resistance, low sludge production and low energy consumption, sludge reduction is achieved, andmeanwhile the indexes of NH<4>< +>-N and TN of the raw water are reduced effectively, so that deep biological removal of nitrogen is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an upflow hydrolytic aerobic denitrification denitrification process for wastewater with poor biodegradability and high ammonia nitrogen. Background technique [0002] With the development of industries such as petroleum, chemical industry, food and pharmaceuticals, and the continuous improvement of people's living standards, the contents of ammonia nitrogen and total nitrogen in urban domestic sewage and landfill leachate have risen sharply. In recent years, with the development of the economy, more and more nitrogen-containing pollutants have been released randomly, which has caused great harm to the environment. Nitrogen is present in wastewater as organic nitrogen, ammoniacal nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 - -N) and nitrite nitrogen (NO 2 - -N) and other forms exist, and ammoniacal nitrogen is one of the most important forms of existen...

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Problems solved by technology

[0008] 1) It is difficult to maintain a suitable sludge concentration for raw water that is not easily biodegradable, that is, it is difficult to maintain a suitable biomass;

[0009] 2) The system has poor impact load resistance, that is, it is sometimes difficult to meet the requirements for changing raw water;

[0010] 3) The treatment effect is relatively poor, and the overall denitrification efficiency is not high;

[0011] 4) The sludge aging problem in the aerobic tank is serious, the secondary sedimentation tank is prone to mud drifting, and the effluent water quality is reduced. It is difficult to maintain the ideal anoxic state in the anoxic section, and the denitrification efficiency is affected

[0014] 2) Biological filters generally use particles with smaller particle sizes, which require regular off-line backwashing. Its backwashing water volume and water head loss are large. Backwashing will change the load of other filters, causing impacts and subsequent operational problems. more;

[0015] 3) It is difficult to control the flushing intensity of the biofilter, and the uneven growth and shedding of the biofilm will also affect the uniformity of the system;

[0016] 4) When the general biofilter runs for a long time, its backwashing effect will gradually deteriorate, so regular high-intensity backwashing is required, and it will take a certain time for the biofilm to recover

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