Integrated sewage treatment device and method for highway service area

Abstract

The invention discloses an integrated sewage treatment device and method for a highway service area, and belongs to the field of water treatment. The device comprises: a water inlet pipe; a regulating tank communicated with an outlet of the water inlet pipe; a multi-stage AO tank arranged beside the regulating tank and comprising a plurality of anoxic tanks and aerobic tanks which are alternately arranged; a membrane bioreactor arranged in the last stage of aerobic tank; a water outlet pump used for outputting the treated sewage; a biological carrier I arranged in the regulating tank and each aerobic tank, and a biological carrier II arranged in the anoxic tank; a water inlet flow distribution module used for distributing sewage in the regulating tank into each anoxic tank; and an aeration module comprising an aeration disc arranged in the last stage of aerobic tank and membrane aeration pipes arranged in other aerobic tanks. According to the invention, the carbon source in the inlet water can be utilized to the greatest extent for biological denitrification, the sludge concentration is improved by a biofilm process to strengthen the pollutant removal effect, the purpose of reducing the water quantity and water quality impact load and stably reaching the standard of the outlet water is achieved by matching with the method, and the membrane pollution is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to an integrated sewage treatment device and method for expressway service areas. Background technique [0002] The expressway service area is an important part of the expressway service system. The expressway service area generally has restaurants, supermarkets, public toilets, gas stations, auto repair stations, staff dormitories and other facilities to provide travelers with catering, rest, accommodation, automobiles, etc. It is of great significance to ensure the safety of transportation, relieve the fatigue of drivers and passengers, and improve the efficiency of transportation services. [0003] In recent years, my country's expressway industry has developed rapidly. By the end of 2018, my country had built 137,900 kilometers of expressways and over 2,700 pairs of expressway service areas. Its economic value and ecological impact have also received wide...

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Problems solved by technology

[0003] In recent years, China's expressway industry has developed rapidly. By the end of 2018, China had built 137,900 kilometers of expressways and over 2,700 pairs of expressway service areas. Its economic value and ecological impact have also received widespread attention. The catering, public toilets, accommodation, auto repair and other services provided by the expressway service area will generate a certain economic value, but at the same time the impact of sewage discharge will be huge. It cannot be ignored that most of the expressway service areas are far away from urban areas, and the sewage generated generally cannot be discharged into the municipal pipe network, and sewage treatment facilities need to be built on the spot. Large impact loads, lack of effective maintenance and management, and other issues have made it difficult for sewage treatment to meet the discharge standards, causing certain pollution to farmland, lakes, and rivers around the expressway service area, and seriously affecting the water environment around the expressway.

[0004] Since the sewage in the expressway service area is mainly catering wastewater from restaurants and fecal sewage from public toilets, accounting for more than 85% of the total sewage volume, the concentration of nitrogen and phosphorus in sewage is 2 to 5 times that of typical urban sewage. Phosphorus is difficult, and the fecal wastewater treated by the septic tank and the catering wastewater passed through the grease trap directly enter the biochemical tank. Although the biochemical requirements of sewage are met, it is not compatible with the long-distance pipeline network transportation of urban sewage treatment. The effective decomposition of macromolecules is different. There is no long-distance pipe network and large adjustment pool in the expressway service area. Macromolecules cannot be effectively degraded and microorganisms are difficult to fully utilize, resulting in substandard effluent quality. At the same time, the scale of sewage treatment is small but the amount of sewage changes. Large and uneven, due to factors such as weather, seasons, time periods, and other special conditions, the traffic of vehicles will be very random, and the water will only be concentrated for 8 to 18 hours in a day, resulting in large fluctuations in the amount of sewage. It is difficult to treat sewage continuously and stably up to the standard

[0005] Therefore, it is increasingly urgent to solve the problems of high water quality and water volume impact load in the expressway service area, difficulty in reaching the standard for low carbon-to-nitrogen ratio sewage treatment, and poor operation stability.

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