The core of LSF active autotrophic biological nitrogen removal technology is Fe-S coupled biological carrier independently developed by Longantei. The biological carrier is composed of Fe-S nano-micronucleus and alkalinity load, which has large specific surface area and high efficiency. The principle of its action is that in anoxic environment, denitrifying bacteria take Fe-S nanonuclei as electron donors, nitro pollutants such as NO3- and NO2- as electron acceptors, and inorganic carbon (CO2, HCO3-, CO32-) as metabolic carbon sources to convert NO3- and NO2- and other pollutants in wastewater into N2. The alkalinity load was distributed evenly in the porous cage of the coupled biological carrier, which could form a synergic mechanism with Fe-S nanopores to effectively balance pH during nitrogen removal and realize self-maintenance of alkalinity activity in water environment. At the same time, the introduction of Fe-S nanopores can effectively promote the metabolic coupling of microorganisms, realize the self-activation of nitrogen removal process, and finally achieve efficient, sustainable and stable nitrogen removal.

(1) Stable chemical properties, long life, reusable.

(2) Do not add any chemical agents to reduce the treatment cost and prevent COD from exceeding the standard.

(3) Short residence time and fast degradation rate.

(4) Do not produce a lot of sludge, reduce the cost of sludge treatment.

(5) The process equipment is simple and the operation is highly automated.

(6) Supporting facilities can be structured and equipped according to the scale and user requirements to meet a variety of needs.

Chemical wastewater, printing and dyeing wastewater denitrification

- Low investment, good effect, no secondary pollution.

● Municipal sewage, river surface water nitrogen removal

-- Short residence time and high nitrogen removal efficiency.

(6) Supporting facilities can be structured and equipped according to the scale and user requirements to meet a variety of needs.