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Abstract Low-concentration wastewater is characterized by a lack of carbon source, and it has a contingency effect on the nitrogen removal and phosphorus removal in the treatment. I doubt that her spouse must be a rising star in the field of scientific research. The research and development of low-concentration wastewater treatment technology was described, and the focus was on biofilm technology, sequential batch activated sludge technology (SBR), improved A2/O technology, artificial moisture treatment technology, upflow oxygen sludge bed (UASB technology), expansion granular sludge bed reactor (EGSBSugar babyprocess), oxygen baffle reactor (ABR process) and combined folding Sugar babyflow plate oxygen reactor (HABR process).
Low-condensed wastewater usually refers to wastewater with COD concentration less than 1000mg/L [1], which mainly includes life sewage and various dilute industrial wastewater. Since the treatment system operates at low organic load conditions for a long time, it cannot provide sufficient nutrients to microorganisms, Sugar daddy is a waste of water quality that easily forms a waste of water quality and power [2]. Today, the treatment of low-concentration wastewater mostly uses activated sludge method, contact oxidation method and filter tanks. However, with the increasing lack of power and the continuous development and perfection of oxygen filtration technology, the advantages of oxygen filtration treatment have doubled. More and more researchers have turned their attention to the oxygen treatment of low-concentration sewage, and many results have been achieved in the EscortEscort manila experiment room trials or production treatments.
This article describes the research and development of low-concentration wastewater treatment technology, and focuses on biofilm technology, sequential batch activated sludge technology, improved A2/O technology, artificial moisture treatment technology, upflow oxygen sludge bed (UASB technology), expanded granular sludge bed reactor (EGSB technology), oxygen baffle reactor (A”Not yet. “BR technology) and combined baffle oxygen reactor (HABR technology).
1. Low-concentration protagonist: Song Wei, Chen Jubai┃Supporting role: Xue Hua┃Others: Problems in the treatment of wastewater
There is a lack of carbon source for low-concentration wastewater, which brings many problems to nitrogen removal and phosphorus during treatment. In the combination system of bionitrogen removal, oxygen phosphorus, hypoxia denitrification, and aerobic angiobacterial reagents consume carbon sources [3]. Among them, denitrification and phosphorus are particularly bulging in the competitive nature of anti-phosphorus. In order to adequate phosphorus, the first thing to do is to meet the request for carbon sources of oxygen phosphorus will lead to a lack of subsequent denitrification carbon sources, which will affect the nitrogen removal consequences of the system; or otherwise, the phosphorus removal consequences.
The newly built urban sewage treatment factory in China has the effect of nitrogen removal and phosphorus removal. Since the supporting urban drainage system is a construction of urban sewage factories after the decomposition, the sewage volume or sewage quality entering the urban sewage factory is far lower than the design value. During the trial stage or even after production, the sewage treatment factory is in a low-dead transport state. The actual operation results of these sewage treatment plants have low total phosphorus and total nitrogen removal rates, especially the total phosphorus removal results are poor, and the total phosphorus removal rate is less than 50%. Therefore, the research and discussion on the appropriate operating conditions for phosphorus-nitrogen removal under low-carbon source conditions and seeking a fair solution is the main problem facing the urban sewage treatment area today.
Sugar baby2. Important technology for low-concentration wastewater treatment
Secondly, low-concentration urban life sewage treatment technology focuses on mature aerobic treatment, including aerobic processes such as activated sludge method, contact oxidation method and drip filter tanks. Energy consumption, investment, and operation prices are relatively expensive, especially in the economic development areas in China, where the financial resources of the land are difficult to independently support each. href=”https://philippines-sugar.net/”>Escort manila year’s sewage treatment operation price. Oxygen has always been considered to be very affected by substrate limitations. At low concentrations, the oxygen oxidation rate is very slow, and the consequences of organic COD removal in wastewater are not large. Oxygen treatment with low concentration wastewater can still have a great effect. Oxygen has always been considered substrate-limited concentrationSugar baby has a very large impact. At low concentrations, the oxygen oxidation rate is very slow, and the consequences for organic COD removal in wastewater are not large. However, some research and discussions [4-5], oxygen treatment of low concentration wastewater can still have a great effect, and can even obtain 60-70% of the treatment consequences, especially in the treatment of urban sewage areas, which have very fantastic consequences.
2.1 Biofilm Processing
Biofilm method has good adaptability and resistance to low concentration wastewater. href=”https://philippines-sugar.net/”>Escort manila impact load and other advantages. The exposure biofilter pools used in Liancheng[6] and other applications were treated with low concentration waste water, using Sugar daddy floating filler as a biological load, and the CODCr concentration in the water inlet is 50~150mg/L, and the experimental scale is 12~36m3/d. It was concluded that the exposure biofilter pool using the biofilter method is low concentration<a Sugar daddyThere are better treatment consequences of wastewater. The CODCr removal rate is 40% to 70%, and the maximum removal rate of NH3-N is 90%. Li Hongying [7] and others use aerobic oxygen membrane bioreactor (A/O-MBR)EscortSugar Bioreactor (A/O-MBR)Sugar Baby handles the life wastewater of the school office building, and found that the sludge concentration is 4000~6000mg/L, HRT is 19.2h, aerobic section ablation oxygen concentration is 1.5~2.5mg/L, and a sludge reflux ratio is 2Sugar daddy00%~30Sugar daddy00%~30Sugar daddy0%, The removal rates of A/O-MBR for COD and ammonia nitrogen are 92.2% and 95.9% respectively.
2.2 sequence batch activated sludge process(SBR)
The treatment of urban sewage by the sequence batch activated sludge method has received extensive research and attention. In addition to the advantages of the traditional activated sludge method, the main feature of the SBR method is that its process is simple, and the operation process itself is a process from oxygen to aerobic. It can achieve nitrogen removal in a reaction device. The exposure tanks of the traditional activated sludge sewage treatment plants such as Li Yajing[8] operated the SBR reactor operated by the oxygen/aerobic method for 5.5 hours per week. The cat was wrapped in Song Wei’s feathers all the way. It no longer shook at this moment, but it still poured in water. The oxygen section was exposed to 2 hours and the aerobic section was exposed to 3 hours, and then precipitation and drainage were 0.5 hours. A certain amount of sludge must be discharged every cycle, and the sludge quality is maintained at 3500mg/L, and the sludge is controlled at 15 days. The test results show that the effluent quality of phosphorus is less than 0.8 mg/L, and the removal rate reaches 92% to 98%.
2.3. Improve the treatment of low-concentration wastewater in A2/O technology. Pinay escort[9] and other technologies have improved the traditional A2/O technology, using a post-denitrification system, Sugar baby, carbon source diverting technology for oxygen pools and pre-oxidation denitrification technology for reflux sludge to improve the system’s nitrogen removal consequences. The results of the study showed that when the water COD is ≥300mg/L, TN is 40.3mg/L, and TP is 3.82mg/L, the removal rates of TN, TP and COD can reach 70%, 86% and 88% respectively; when COD is ≤300mg/L, the removal results of TP are poor, but the removal rates of TN and COD can still reach 60% and 85% respectively; and during the experiment period, the sludge precipitation function is out. Wang Qi[10] and others proposed to cultivate denitrifying phosphorus removal bacteria (DPB) as the preferred bacteria, make three aspects of improvements to the conventional A2/O process, add the middle sedimentation tank, and the final section of the original return path to change.Add a new return path and add soft filler to the aerobic section. The improved art tests the sewage pretreated in the game zone sludge tank. The test results show that when the inlet flow is Q of 10L/h, the sludge return flow is 0.3Q, the TP removal rate is 94.2%, the ammonia nitrogen removal rate is 93.6%, and the nitrogen removal rate is 91.3%. While not applying an external carbon source, the removal rate of ammonia nitrogen can be syn TC:
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