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Two level A/O integrated processing equipment

Breeding wastewater/livestock and poultry farm wastewater: high concentration organic wastewater with high ammonia nitrogen content. Industrial park wastewater: Chemical, printing and dyeing, and food processing wastewater have complex components and high ammonia nitrogen concentrations. Garbage leachate treatment: The leachate from landfills and transfer stations has extremely high ammonia nitrogen levels (500-5000mg/L), and the carbon nitrogen ratio is severely imbalanced.

National Service Hotline：400-611-6861
Product Introduction

The two-stage A/O process consists of two-stage anoxic aerobic units connected in series:

Level 1 A/O (high load section): undertakes the main tasks of carbon oxidation and ammonia nitrogen nitrification, reducing the concentration of ammonia nitrogen to a lower level (such as within 100mg/L)

Secondary A/O (low load section): further remove residual total nitrogen and ammonia nitrogen to ensure that the effluent meets the standard

The nitration solution from the first stage aerobic tank flows back to the first stage anoxic tank for denitrification and denitrification. For wastewater with a total nitrogen content of 150-300mg/L, the total denitrification rate can reach 70-90%.


Technical Advantage
Efficient denitrification and strong resistance to impact loads
The two-stage AO has good treatment capacity for high concentration ammonia nitrogen (500-5000mg/L), with high MLSS in the system (up to 8000mg/L or more), COD removal rate>95%, and ammonia nitrogen removal rate>97%. Segmented inflow, flexible allocation of carbon sources, stable treatment effect.
Low operating costs, energy-saving and consumption reducing
By adopting full gas lift control technology, there are no internal power components, and the operating cost can be reduced to 0.3-0.6 yuan/ton of water. The original pool body can be modified according to local conditions, and the investment cost is controllable.
Easy maintenance and unmanned operation
Easy maintenance and unmanned operation: Designed using pure biofilm method, it is usually unmanned and only requires a 2-week inspection for later maintenance. Operators can get started within 1-3 months, and repair parts are universal and easy to purchase.
High equipment integration and land saving
High equipment integration and land saving: integrated sludge tank and disinfection tank, equipment land area ≤ 0.5 ㎡/ton of water. The highest effluent index can reach the Class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).
Process Selection

Inlet ammonia nitrogen concentration


Process configuration suggestions


explanation


<100mg/L


Single level A/O


Suitable for conventional domestic sewage, two-stage treatment is not necessary, and can meet basic denitrification needs


100-300mg/L


Two level A/O


Suitable for medium concentration ammonia nitrogen wastewater, with a total denitrification rate of 70-90%, ensuring that the effluent meets the standard


>300mg/L (such as leachate from garbage)


Two level A/O+deep processing (Fenton et al.)


High concentration ammonia nitrogen wastewater treatment requires the combination of Fenton and other physicochemical treatment units to improve denitrification efficiency



Equipment Selection

Material Characteristics Applicable Scenarios

Carbon steel has high anti-corrosion strength, low cost, and anti-corrosion life of more than 10 years for ground installation and large-scale projects

Fiberglass reinforced plastic (FRP) is corrosion-resistant, lightweight, and suitable for factory prefabrication, underground installation, small-scale, and convenient transportation scenarios

Stainless steel has strong corrosion resistance, long service life, high standard requirements, and special water quality

Control system: PLC fully automatic control, supporting remote monitoring and alarm functions.

Aeration system: fan+microporous aerator to ensure sufficient dissolved oxygen.

Dosing system: Phosphorus removal agent dosing device (configured according to the total phosphorus requirements of the effluent).

Disinfection unit: Chlorine tablet disinfection/UV disinfection (according to emission requirements).

Sludge treatment: sludge tank+regular external transportation for disposal.


Friendship Link
Huapu Environmental Protection Huapu Water Treatment Equipment