Quick starting method for technology for simultaneous denitrification and COD removal under condition of normal-temperature and low-C/N sewage

Abstract

The invention belongs to the field of treatment and regeneration of urban sewage, and provides a quick starting method for a technology for simultaneous denitrification and COD removal under the condition of normal-temperature and low-C / N sewage. The method comprises the steps as follows: firstly inoculating some mature CANON sludge, and enabling the CANON sludge to perform biofilm culturing on volcanic rock filtering material, and quickly constructing an aerobiotic AOB and anammox oriented microbial system; then reducing the inflowing water substrate concentration and adjusting the aeration and hydraulic retention time, so as to improve the nitrogen removal load, and realize the high-load stable operation of the CANON technology under the condition of a medium ammonia nitrogen substrate; finally adding an organic carbon source into the inflowing water, performing heterotrophy for the growth of denitrifying bacteria, and controlling the temperature, free ammonia, aeration and other conditions, so as to optimize the aerobiotic AOB, anammox and denitrifying bacteria coexisted micro-environment, and successfully start an SNAD technology. According to the invention, the difficult problems that a large amount of organic carbon sources are required to be added for biological denitrification in the long term and the cost is prodigious are solved, and a method is provided for starting of the SNAD technology under the condition of normal-temperature and low-C / N simulated wastewater.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and regeneration. In particular, it relates to a rapid start-up method dedicated to the biofilm simultaneous denitrification and COD removal (SNAD) process at normal temperature and medium ammonia nitrogen level. Background technique [0002] With the growth of economic level and the intensification of human activities, water pollution is becoming more and more serious, among which nitrogen pollution is a major hazard, which has a great impact on the natural environment and human health. At present, for the removal of nitrogen, urban sewage treatment plants mostly adopt the denitrification process based on the traditional nitrification and denitrification principle, such as A 2 / O, oxidation ditch, etc. Although these processes have a certain removal effect on nitrogen, they need to add a large amount of organic carbon sources in the process, consume a large amount of alkalinity an...

AI Technical Summary

Problems solved by technology

However, at present, the SNAD process is still in the stage of experimental research, and when the CANON process was initially constructed, artificial water distribution with high temperature and high ammonia nitrogen was used or industrial wastewater such as digested sludge dehydration liquid and landfill leachate was used.

The research conclusions of many researchers show that the stable anammox reaction in the CANON reactor is an important guarantee for the successful start-up and even stable operation of the process. However, the anammox bacteria have a longer growth cycle and a lower growth rate (μ =0.0027h -1 , the doubling time is 10.6d) which limits its application and development in practical engineering

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