Human domestic wastewater primarily consists of fecal matter and laundry wastewater.

Wastewater from domestic sources contains a high concentration of organic matter, such as cellulose, starch, sugars, and fats, as well as proteins; it is also frequently laden with pathogenic bacteria, viruses, and eggs of parasites. It also includes inorganic salts like chlorides, sulfates, phosphates, bicarbonates, and elements such as sodium, potassium, calcium, and magnesium. Characterized by high nitrogen, sulfur, and phosphorus content, it is prone to produce malodorous substances under the action of anaerobic bacteria.

If the arbitrary discharge of domestic wastewater can pollute groundwater, resulting in severe consequences of widespread contamination, it will make the already insufficient groundwater resources even scarcer, leading to more residents being unable to access clean drinking water.

Wastewater, after treatment through an integrated wastewater treatment system, can effectively reduce pollution to underground water sources.

Overview:

Our integrated wastewater treatment equipment employs various treatment processes, primarily categorized into two: the activated sludge process and the biofilm process. Common methods such as the conventional aeration, oxidation ditch, A/B, and A2/O processes fall under the former, while the biological rotating disk and contact oxidation process belong to the latter.

The integrated wastewater treatment equipment combines a primary sedimentation tank, I and II stage contact oxidation tanks, a secondary sedimentation tank, and a sludge tank into one unit. It performs aeration and aeration in the I and II stage contact oxidation tanks, effectively integrating the contact oxidation process with the activated sludge process. This approach combines the advantages of both methods while overcoming their drawbacks, thus enhancing the overall wastewater treatment level.

Principle of Operation:

The removal of organic pollutants and ammonia nitrogen in domestic wastewater treatment equipment primarily relies on the AO biological treatment process within the equipment.

Grade A

At level A, due to the high concentration of organic matter in the wastewater, the microorganisms are in an anaerobic state, at this point they are facultative microorganisms. Therefore, the A level tank not only has a certain organic matter removal function, but also reduces the organic load of the subsequent aerobic tanks, resulting in a decrease in organic matter concentration. However, there is still a certain amount of organic matter and a high NH3-N level. To further oxidize and decompose the organic matter, and to ensure the smooth progress of nitrification under carbonation, an aerobic biological contact oxidation tank with a lower organic load is set up at level O.

O-Level

In the O-stage pond, aerobic microorganisms and autotrophic bacteria (nitrifying bacteria) are predominantly present. The aerobic microorganisms decompose organic matter into CO2 and H2O; the autotrophic bacteria (nitrifying bacteria) utilize inorganic carbon from the decomposition of organic matter or atmospheric CO2 as a nutrient source, converting NH3-N in wastewater into NO-2-N and NO-3-N. A portion of the effluent from the O-stage pond is recycled back to the A-stage pond, providing an electron acceptor for the A-stage pond. This process eliminates nitrogen pollution through denitrification.