Transformation method for upgrading village and town domestic sewage

Abstract

The invention discloses a transformation method for upgrading village and town domestic sewage. According to the transformation method, treatment is carried out based on a deep treatment semi-fixed bed biochemical pool and a carbon source adding and circulating system. The transformation method comprises the following steps: sewage enters the deep treatment semi-fixed bed biochemical pool through a sewage header pipe; sewage is fed into an anoxic unit for treatment by a water impeller, then is treated by a carbon-adding anaerobic unit and an aerobic unit, and is discharged into an air flotation sedimentation tank through a water outlet tank; and a phosphorus removal agent is added in the process that the water body passes through the water outlet tank, the water body containing the phosphorus removal agent enters the air flotation sedimentation tank to be treated, then the water is discharged into a disinfection channel, and after the water body passes through a Parshall metering tank, the outlet water is detected to reach the designed discharge standard, and then the water body is discharged into a receiving water body. According to the scheme, the occupied area can be saved, the equipment is integrated, the water quality can stably reach the standard, the investment is saved, the energy consumption is low, the maintenance is convenient, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of advanced treatment of sewage in environmental engineering, in particular to a transformation method for upgrading domestic sewage in towns and villages. Background technique [0002] With the rapid growth of my country's economy, the acceleration of urbanization, the continuous improvement of rural living standards, and the development of rural livestock and poultry breeding and agricultural and sideline product processing, the amount of domestic sewage and industrial wastewater in rural areas is increasing day by day. [0003] Township domestic sewage mainly comes from residents' domestic sewage. At present, the treatment methods for the above-mentioned domestic sewage mainly include the following: most of the domestic sewage in township areas is directly discharged into farmland and rivers without treatment, resulting in rural water pollution. It is becoming more and more serious, and the residents' dom...

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Problems solved by technology

[0003] Township domestic sewage mainly comes from residents' domestic sewage. At present, the treatment methods for the above-mentioned domestic sewage mainly include the following: most of the domestic sewage in township areas is directly discharged into farmland and rivers without treatment, resulting in rural water pollution. It is becoming more and more serious, and the residents' domestic water mainly comes from rural water resources, and the polluted water will seriously affect the health of town residents; some towns and villages transport domestic sewage to urban domestic sewage treatment plants for unified treatment , this method can completely treat domestic sewage, but due to the long transportation distance, the cost of domestic sewage treatment has increased; there are also some townships that use domestic sewage pipes to collect the domestic sewage of township residents to chemical plants built by themselves in towns. In the septic tank, the septic tank is used to settle the impurities in the domestic sewage and decompose the suspended solid organic matter in the domestic sewage, and finally the solidified matter settles at the bottom of the pool, and the hydrated matter in the upper layer enters the pipeline and is directly discharged outside or into the river. As a result, rivers and the environment are polluted; in order to solve the problem of water pollution caused by hydrates directly discharged by septic tanks, a small number of towns have also built domestic sewage treatment plants. These domestic sewage treatment plants mainly undergo septic tank pretreatment, exposure A series of operations such as air pool, sedimentation, filtration, and disinfection purify domestic sewage. There are mainly the following problems in this domestic sewage treatment method: First, the treatment process is relatively complicated, so it is necessary to build a large-scale domestic sewage treatment plant and configure enough Only advanced domestic sewage treatment equipment can achieve the final purification effect, resulting in an increase in the cost of domestic sewage treatment; second, with the increase in the number of domestic sewage treatment, the decomposition efficiency of the aeration tank will gradually decrease, resulting in a decrease in the quality of the effluent. Human studies have found that most of the aeration tanks currently on the market use aeration devices that are not uniform in aeration and are prone to blockage during the aeration process. Moreover, the activated sludge in the aeration tank is easy to flow to the next with the domestic sewage. In the water treatment unit, the activated sludge contains microorganisms that play a major role in decomposition. With the frequent treatment of domestic sewage, the amount of activated sludge in the aeration tank decreases, resulting in a decrease in the decomposition efficiency of the aeration tank. Some manufacturers also use sludge backflow The treatment method returns the sludge in the sedimentation tank to the aeration tank. On the one hand, this method increases the construction cost of the domestic sewage treatment plant. On the other hand, the activated sludge will be deposited in the sedimentation tank before it is returned. The speed and concentration of mud return, most of the microorganisms returned to the aeration tank have passed the stable period and entered the decay period, even if they are returned to the aeration tank, the decomposition efficiency of the aeration tank cannot be significantly improved, resulting in The water flowing out of the air pool contains a lot of suspended solids, which cannot meet the domestic sewage discharge standards stipulated by the state

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