Help with sewage

:):):):):):):) No problem

See how high the ammonia nitrogen level is?

There really is no problem, because you didn’t make it clear that there was a problem.

When ammonia nitrogen remains high for a long time while phosphorus levels are low, may I ask what process you use?

When the ammonia-nitrogen level is high in the A/O process—reaching up to 150—the phosphorus level remains at only 0.5

There will be no problem with A2/O. Since there is no high ammonia nitrogen level caused by incomplete acid hydrolysis, considering the use of a UASB process could be an option! ! For reference only!

A/O is an abbreviation for Ano*c/O*c. The A/O biological phosphorus removal process is a wastewater biological treatment system consisting of two stages: anaerobic and aerobic reactions. After entering the anaerobic tank, the wastewater mixes with the returned sludge. The polyphosphates in the activated sludge absorb large amounts of BOD from the wastewater during this process, and release the phosphorus present in the sludge into the mixture in the form of orthophosphate. After the mixture enters the aerobic tank, the organic matter is oxidized and decomposed, while polyphosphate-accumulating bacteria absorb large amounts of orthophosphates from the mixture into the sludge. Since phosphorus-accumulating bacteria absorb more phosphorus under aerobic conditions than they release under anaerobic conditions, phosphorus removal is achieved through the alternating aerobic and anaerobic processes, along with sludge separation in the secondary sedimentation tank. Its advantage is that in addition to degrading organic pollutants, it also has the capability to remove nitrogen and phosphorus; under normal conditions, the removal rate of TP can exceed 85%. 　　The A/O process combines an initial anoxic stage and a subsequent aerobic stage in series; in the A stage, DO is no more than 0.2 mg/L, while in the O stage, DO is 2–4 mg/L. In the anoxic zone, heterotrophic bacteria hydrolyze suspended pollutants such as starch, fibers, and carbohydrates, as well as soluble organic matter in the wastewater into organic acids. This process breaks down large-molecule organic substances into smaller ones, and transforms insoluble organic matter into soluble organic matter. When these products of anoxic hydrolysis enter the aerobic tank for aerobic treatment, they enhance the biodegradability of the wastewater and improve oxygen utilization efficiency ； In the anoxic zone, heterotrophic bacteria convert pollutants such as proteins and fats into ammonia by releasing ammonia (NH3, NH4+) from the nitrogen in organic chains or the amino groups in amino acids. Under conditions of sufficient oxygen supply, autotrophic bacteria carry out nitrification, oxidizing NH3-N (NH4+) to NO3-. This nitrogen is then returned to tank A through recirculation. In anaerobic conditions, denitrifying bacteria reduce NO3- to gaseous nitrogen (N2), thus completing the cycle of C, N, and O in the ecosystem and enabling the harmless treatment of wastewater

This post was last edited by fangqiong on 2011-2-14 10:43. Factors affecting the O process: During the operation of the A/O process, it is necessary to prevent sludge bulking and loss; its degradation rate for organic matter is high (90–95%), but its efficiency in nitrogen and phosphorus removal is relatively low. If the phosphorus concentration in the raw wastewater is 4 to ensure an adequate carbon/nitrogen ratio, otherwise the denitrification rate drops rapidly ； However, in the nitrification tank, the BOD5 value should be kept below 80 mg/L. When the BOD5 concentration is too high, heterotrophic bacteria multiply rapidly, inhibiting the growth of autotrophic bacteria and causing the nitrification process to come to a halt. 　　⑧Dissolved oxygen in the nitrification tank: DO > 2 mg/L. Generally, to ensure sufficient oxygen supply, the DO level should be maintained at 2–4 mg/L to meet the oxygen requirements for nitrification. Calculations show that 4.57 g of oxygen is needed to oxidize 1 g of NH4+. 　　⑨Hydraulic retention time: Hydraulic retention time for nitrification > 6 hours ； The hydraulic retention time for denitrification is 2 hours; the ratio between the two is 3:1. Otherwise, the nitrogen removal efficiency drops rapidly. 　　⑩pH: During the nitrification process, HNO3 is produced, causing the pH of the mixture to decrease. Nitrifying bacteria are highly sensitive to pH; the optimal pH for nitrification is 8.0–8.4. To maintain this appropriate pH level, corresponding measures must be taken. Calculations show that to completely nitrify 1 g of ammonia nitrogen (NH3-N), approximately 7.1 g of alkalinity (expressed as CaCO3) is required ； The alkalinity generated during denitrification (3.75 g of alkalinity per g of NOx--N) can compensate for about half of the alkalinity consumed by the nitrification process. The optimal pH for denitrification is 6.5–7.5; values above 8 or below 7 are unfavorable. 　　⑾Temperature: The nitration reaction occurs at 20–30°C; below 5°C, the nitration reaction almost stops ； The denitrification reaction occurs at 20–40°C; below 15°C, the denitrification rate drops rapidly. 　　Therefore, in winter, measures such as increasing the sludge age ts for denitrification, reducing the load rate, and increasing the hydraulic retention time should be taken to maintain the denitrification rate. Start by addressing the issue from two aspects: 1. Increase the reflux ratio and raise the sludge concentration. 2. Appropriately increase the sludge age

With the A/O2 process we use, the ammonia nitrogen level can reach 160, while phosphorus levels are between 0.5 and 1; the ammonia nitrogen in the effluent meets the specified standards. There should be no problem; it mainly depends on the sludge load. It would be even better if there are no requirements regarding total ammonia in the effluent.