A device for treating high-concentration ammonia-nitrogen wastewater and a process for using the device to treat high-concentration ammonia-nitrogen wastewater

Abstract

The present invention relates to a device for treating high-concentration ammonia nitrogen sewage and a process for treating high-concentration ammonia nitrogen sewage using the device. The device comprises a sedimentation tank, a stabilization tank, a biofilter, a gasification high-efficient nitrification reactor and an evaporation-crystallization reactor, the treatment process comprises allowing the sewage to flow into the above device, intercepting a majority of suspended materials in the sewage by the precipitation tank, and then enabling the sewage to flow into the stabilization tank, lifting the sewage in the stabilization tank by the pump to the biofilter for treating and enabling the sewage to flow back to the stabilization tank to form an internal circulation, allowing the spillover sewage to enter the gasification high-efficient nitrification reactor for nitrification treatment, enabling the spillover sewage subjected to the nitrification treatment to enter the evaporation-crystallization reactor to generate the final solid product. Through the above-mentioned technical solution, the present invention provides a device for treating high-concentration ammonia nitrogen sewage and a process for treating high-concentration ammonia nitrogen sewage using the device which can improve the treatment effect and realize the resource utilization.

Description

technical field [0001] The invention relates to a sewage treatment device and a process using the device. technical background [0002] Ammonia nitrogen in sewage is one of the main factors causing water eutrophication. In the existing sewage treatment process, ammonia nitrogen must be fully removed to ensure the ecological safety of the treated water. [0003] At present, common treatment methods for high-concentration ammonia-nitrogen wastewater such as urine, biogas slurry, ammonia synthesis process wastewater, and landfill leachate include stripping, adsorption, struvite crystallization, electrocatalytic oxidation, biological nitrification-denitrification, ecological treatment, and denitrification. However, the current high-concentration ammonia nitrogen wastewater treatment process still has the following problems: 1. For the most commonly used biological nitrification-denitrification process, high-concentration ammonia nitrogen wastewater will form nitrite nitrogen aft...

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Problems solved by technology

[0003] At present, common treatment methods for high-concentration ammonia-nitrogen wastewater such as urine, biogas slurry, ammonia synthesis process wastewater, and landfill leachate include stripping, adsorption, struvite crystallization, electrocatalytic oxidation, biological nitrification-denitrification, ecological treatment, and denitrification. However, the current high-concentration ammonia nitrogen wastewater treatment process still has the following problems: 1. For the most commonly used biological nitrification-denitrification process, high-concentration ammonia nitrogen wastewater will form nitrite nitrogen after nitrification, and make The pH value of wastewater decreases, which inhibits the nitrification function of nitrifying bacteria, so that the nitrification is not complete, and a large amount of aeration is required in the nitrification process, and how to improve the mass transfer effect of water-liquid interface oxygen during the aeration process has always been a problem. In addition, in the denitrification process, carbon sources need to be added to ensure the reaction, which increases the treatment cost, and the ammonia nitrogen cannot be recycled; 2. For the stripping process, it is first necessary to add alkali to adjust the pH of the wastewater to To ensure the occurrence of the stripping process, the stripped ammonia nitrogen needs to be absorbed by acid, and there is still a certain amount of ammonia nitrogen in the wastewater after stripping, which needs further treatment to ensure that the effluent meets the standard. In addition, the resource utilization of the absorption liquid is not very good at present. 3. For the adsorption process and the electrocatalytic oxidation process, the consumption of adsorbent or electricity during the treatment process is large, and the treatment cost is high, so the process is difficult to promote, and ammonia nitrogen cannot be effectively recycled; 4 1. For the struvite crystallization process and reverse osmosis process, although the treatment effect is better, and the product can be recycled, there is also the problem of high treatment cost; 5. For the ecological treatment process, its floor area is relatively large Large, difficult to implement in cities

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