Quick starting method for treating total nitrogen in nitrogen-containing wastewater by two-stage A/O process

Abstract

The invention provides a quick starting method for treating total nitrogen in nitrogen-containing wastewater by a two-stage A / O process. The method comprises the following steps: firstly, placing an inoculum in a two-stage A / O reactor, wherein the inoculum is any activated sludge without expanding or denitrification bacteria cultured by multiplication; then, controlling the sludge load at a certain value for starting, wherein the sludge load does not exceed 0.22kg COD / kg MLSS.d during initial water inflow, the sludge load is maintained for 1-2 days and then the sludge load of the system is controlled at 0.18-0.3kgCOD / kgMLSS.d, the initial start nitrogen concentration is controlled to be 60-100mg / L, the final nitrogen concentration is controlled at 200-350mg / L, the inflow carbon nitrogen ratio is 10-12 and is gradually decreased to 3-8, and when the total nitrogen removal rate in discharged water is stably higher than 90%, the sludge SVI value is smaller than 120mL / g, and a two-stage A / O denitrification system is started. The starting method provided by the invention has a short starting time and high total nitrogen removal efficiency, and can effectively prevent sludge expansion and ensure the long-term stable operation of a denitrification reactor.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a quick-start method for treating total nitrogen in nitrogen-containing wastewater by a two-stage A / O process. Background technique [0002] With the development of industrial and agricultural production, more and more sewage is discharged, the types of wastewater are more complex, water pollution is becoming more and more serious, and eutrophication and algal blooms caused by nitrogen in wastewater are becoming more and more obvious. Therefore, all countries have set strict discharge standards for nitrogen-containing substances in wastewater. At present, developed countries such as the United States, France, Japan and other countries have strict discharge standards for effluent total nitrogen, while my country is still limited to the discharge requirements of ammonia nitrogen until the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB...

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Problems solved by technology

[0008] The start-up of the above denitrification systems does not consider the change of sludge performance. If only the denitrification efficiency is considered during the start-up process, the slight changes in the sludge with the condition control will affect the long-term stable operation of the entire denitrification system.

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