8results about How to "Reduce aeration" patented technology

The utility model provides a kind of etching cavity for realizing process gas quick switching, and etching cavity includes plasma source chamber and reaction chamber, and the upper surface of reaction chamber is equipped with the gas inlet of process gas;Quick gas replacement device includes the gas pipeline, gas control assembly and gas inlet pipeline that are sequentially communicated along process gas gas inlet direction;Gas pipeline is communicated with process gas gas source, and gas inlet pipeline is communicated with gas inlet;Gas control assembly includes the input, gas inlet valve, flow controller, process gas branch and output that are sequentially communicated along process gas gas inlet direction;Input is communicated with gas pipeline, and output is communicated with gas inlet pipeline;Gas control assembly is also equipped with fixed plate, and fixed plate is installed in plasma source chamber, and the input, gas inlet valve, flow controller, process gas branch and output are sequentially installed in the fixed plate.The utility model solves the problem that deposition gas and etching gas are difficult to quickly switch and accurately control in quick alternate process.

The utility model discloses a short-cut nitrification coupling anaerobic ammonia oxidation integrated reactor, a perforated plate is arranged in the reactor, and a first part for short-cut nitrification and a second part for anaerobic ammonia oxidation are respectively distributed on the upper side and the lower side of the perforated plate; sludge of nitrite bacteria is attached to the interior of the first part through a first filler so as to fix aerobic bacteria, and the first part is connected with an aeration source; anaerobic ammonia oxidizing bacteria are fixed in the second part through a second filler; the size of the filler is greater than the hole size of the perforated plate; the second part is provided with a muddy water backflow and separation module; the muddy water backflow and separation module comprises the muddy water separation area and a sludge backflow area which is integrally connected with the muddy water separation area; a water outlet pipe is connected into the mud-water separation area and is used for separating and discharging aged sludge. The reactor can stabilize the growth of dominant bacteria and improve the denitrification treatment effect.

The invention discloses a device for controlling the pH value of feedwater raw water through micro-nano bubble liquid generated by reinforcing carbon dioxide dissolution coupling cold energy recovery, and belongs to the technical field of feedwater treatment. The device comprises a cold water tank, a pressure pump, a dissolved air tank, a pressure relief tank, a pH regulating tank, a water inlet and outlet system and a PLC control box, according to the device, water and carbon dioxide are efficiently mixed through sudden change of the flow rate and pressure of liquid in a venturi tube of a dissolved air tank; according to the device, the water temperature is reduced through cold energy released during heat absorption gasification of liquid carbon dioxide for subsequent gas dissolving in the gas dissolving tank, and the cold energy released during gasification of the carbon dioxide is fully utilized to reduce the water temperature to promote gas dissolving; according to the device, the gas dissolving amount under the pressure reduction condition is further guaranteed through the pressure relief tank and the venturi tube, so that gas dissolving water rich in carbon dioxide micro-nano bubbles is stably generated and used for being mixed with raw water of a water supply plant according to different proportions, then pH control is achieved, and the utilization rate of carbon dioxide is increased.

The utility model relates to the technical field of wastewater treatment, in particular to a low-carbon biological treatment system which comprises a pretreatment module, a decarbonization module and a biological denitrification module, the pretreatment module comprises an adjusting tank and a pretreatment section, the adjusting tank is used for homogenizing and homogenizing wastewater entering the adjusting tank, and the pretreatment section is used for removing toxic and harmful pollutants which cannot be biologically degraded; the decarburization module comprises an aeration tank and a sedimentation tank and is used for removing organic matters in the wastewater. An MABR reaction zone and an anaerobic ammonia oxidation reaction zone are integrated into an up-flow reactor, an MABR reaction layer and an anaerobic ammonia oxidation reaction layer are formed in the reactor, multifunctional pollutant removal can be achieved, meanwhile, a pipeline for sludge dredging and discharging is arranged, it is guaranteed that the two processes can complement each other, partition reaction can be achieved, and the effect that the two processes can be recycled is achieved. And the function is not influenced by integrated design.

The application discloses a kind of multistage cooperative biological denitrification and nitrous oxide control system and method.The system includes sequentially connected urban sewage raw water tank, AMOA reactor and sedimentation tank, wherein AMOA reactor includes sequentially communicated anaerobic zone, MABR membrane zone, aerobic zone and post-anoxic zone.The method includes: urban sewage with carbon-nitrogen ratio ≤4 is passed into system, MABR membrane zone is controlled to use periodical exhaust mode to carry out bubbleless aeration, dissolved oxygen concentration of aerobic zone is controlled to be 1.5-2.5 mg / L, hydraulic retention time is controlled to be 7.8 h and continuously operated.The application is under the condition that the carbon-nitrogen ratio of influent is ≤4, total nitrogen in effluent is stably lower than 10 mg / L (average 6.4 mg / L), removal rate reaches more than 80%;without additional carbon source, only single-stage sludge return is retained, aeration energy consumption is reduced by more than 38%, N2O emission is reduced by more than 96%;hydraulic retention time is only 7.8 h, which is shortened by more than 35% compared with traditional process;and can be based on existing AAO process in situ modification, with significant investment, short cycle, has obvious popularization and application prospect.

This invention relates to a high NH4 content + ‑N, high NO3 — -N and high F — The high-efficiency, low-consumption treatment process for photovoltaic wastewater involves initially removing fluoride from the wastewater, which then enters a synergistic short-cut denitrification tank. Through the synergistic effect of heterotrophic short-cut denitrification and sulfur autotrophic short-cut denitrification in the tank, NO3... — -N denitrification reaction controlled at NO2 — This step, involving the addition of nitrogen (N), avoids full-scale denitrification by combining the effluent from short-cut denitrification with high NH4 levels. + -N silane wastewater is mixed in an intermediate tank and then undergoes efficient denitrification via an anaerobic ammonia oxidation (AAO) reactor. The effluent from the AAO reactor enters the MABR (Maintenance-Based Bioreactor) tank. The unique layered structure of the MABR biofilm ensures that nitrification / short-cut nitrification, AAO, and denitrification / short-cut denitrification reactions occur in the same reactor, achieving deep denitrification and removal of residual COD. This process achieves acid-base balance during the biochemical reactions, saving 100% of the acid and alkali dosage. Sludge production is only 10% of that of traditional denitrification processes under the same load, significantly reducing operating costs.

The single-tower multi-stage self-circulation sewage treatment device with the built-in partitions comprises a tower body, a water inlet pipe, a water outlet pipe and a cross-shaped partition plate, the tower body is divided into an aeration area, an aerobic area, an anoxic area and an anaerobic area by the cross-shaped partition plate, and an aeration disc is arranged at the bottom of the aeration area; the aerobic zone, the anoxic zone, the anaerobic zone and the aeration zone are communicated through the first circulating column, the second circulating column, the third circulating column and the fourth circulating column, and granular sludge is inoculated in the aerobic zone, the anoxic zone and the anaerobic zone. The sewage treatment method comprises the following steps: a) self-circulation; b) carrying out denitrification reaction; c) aeration reaction; d) carrying out aerobic reaction; and e) carrying out anoxic reaction. According to the single-tower type multi-stage self-circulation sewage treatment device with the built-in partitions and the method, the whole device adopts a single-tower body, so that the space utilization rate is high, the arrangement is convenient, and an external power source is not needed; and a corresponding control strategy is adopted, so that the removal effect of ammonia nitrogen and organic matters in the sewage is ensured.

This invention provides a method and apparatus for low-carbon, ultra-deep denitrification of urban wastewater, belonging to the field of wastewater treatment and applied to urban wastewater treatment. In a continuous flow anaerobic-aerobic-anoxic alternating-post-anoxic process, urban wastewater and returned heavy sludge enter the anaerobic zone of a biological treatment tank. Returned light sludge and added hydroxylamine enter the aerobic-anoxic alternating zone of the biological treatment tank. The sludge-water mixture flowing out of the post-anoxic zone of the biological treatment tank enters a secondary sedimentation tank for sludge-water separation. The supernatant is discharged as effluent, and the settled sludge enters a hydrocyclone separator to be separated into heavy sludge and light sludge. The heavy sludge and part of the light sludge are returned to the process as described above, and part of the light sludge is discharged as excess sludge. Microorganisms in the sludge store internal carbon sources in the anaerobic zone of the biological treatment tank. Short-cut nitrification and endogenous denitrification are achieved in the aerobic-anoxic alternating zone of the biological treatment tank. Ultra-deep endogenous denitrification is performed in the post-anoxic zone of the biological treatment tank. This invention can achieve low-carbon, ultra-deep denitrification of urban wastewater.