Advantages and disadvantages of using a split system for domestic drainage systems

Generally speaking, the diversion system is used in the new urban area and the interception confluence system is used in the old urban area. However, in view of the actual situation of China's current drainage system, it is difficult to achieve the diversion system in the real sense in practice. If one of the rain and sewage systems is wrongly connected, the two systems will be connected, which may be a confluence system.

According to the practice of the off-site pipe network project of a sewage plant, the complete diversion system must start from the diversion of the septic tank outlet, and the construction of professional supervision and professional team must be adopted. At the same time, the initial rainwater pollution is also relatively serious, and the interception confluence system is conducive to the interception of the initial rainwater, so it is recommended that the interception confluence system should be used in small and medium-sized cities. Most of the Tokyo metropolitan areas of Japan use the combined sewer system, and they believe that although the combined system will increase the amount of sewage treatment, the combined sewer system can make full use of the original sewer system, and the construction cost and technical requirements for renovating, rebuilding and improving it are lower than the diversion system, so it is widely used.

2.The whereabouts of the wastewater treatment plant drainage.

At present, the state emphasizes the recycling and reuse of water, and it is necessary to change from "pollution control" to "water ecological restoration and restoration", so it is advisable to discharge the treated sewage from the sewage plant to the nearest way that can be used as reclaimed water reuse or can be discharged to the inland river for landscape water. However, the environmental impact assessment often recommends that the treated sewage be discharged to the outer river center on the grounds of accident discharge, and how to reconcile the contradiction between the two is worthy of further discussion.

1) The development of new technologies for sewage treatment.

From the perspective of sustainable development, it is not suitable for China's national conditions to adopt the process of high resource occupation (materials, land) and high energy consumption and low load of delayed aeration, and the process of achieving sludge stabilization in an energy-consuming manner is not suitable for China's national conditions, and from the development trend of domestic sewage reactors, it is not suitable for the development of activated sludge process and biofilm reactor to efficient moving bed and fluidized bed.

Recently, China has tried to use a high-efficiency carrier bioaugmentation AO process, which is to add active diatomaceous earth at the end of the aerobic tank of the AO reaction pool, and at the same time the aerobic nitrification solution and sedimentation sludge are refluxed to the anoxic pool, and the high-efficiency carrier biological action (fluidized bed) and physical and chemical effects such as adsorption, coagulation and filtration are used to realize biological de-n and physicochemical removal of P, which better solves the problem of contradiction between de-N and P removal in pure biological or pure chemical sewage process.

2) The promotion of new pipes in the design of sewage pipelines.

In water supply and drainage projects, the promotion of PCCP pipes, PVC U pipes, PE pipes, polypropylene (PP) and other new plastic composite pipes is in line with the national policy of replacing steel with plastic. At the same time, the pipeline has small friction, large drainage, light weight and convenient construction, which is unanimously welcomed by the owner and the construction party. However, in the specific use process, attention should be paid to the problem of excessive pipeline deformation caused by construction, and the backfill quality of the backfill on both sides of the pipeline should be ensured, and it must be layered and tamped to make it compact to reach more than 95.

The diversion system is the diversion of rain and sewage, which is a sewage discharge method that separates urban sewage from rainfall runoff and discharges or subsequently treats it with a drainage pipe. Rainwater can be directly discharged to the river through the rainwater pipe network, or can be used as landscape water and municipal water after natural precipitation. Sewage needs to be collected through the sewage pipe network and sent to the sewage treatment plant for treatment, and the water quality meets the corresponding national or local standards before being discharged into the river. The diversion of rain and sewage is convenient for rainwater collection and centralized management and discharge, reduces the impact of water volume on the sewage treatment plant, avoids the pollution of sewage to the river and groundwater, and ensures the treatment efficiency of the sewage treatment plant.

However, this drainage system also has two problems, one is that there are misconnections and mixed connections, and sewage enters the rainwater pipe or rainwater enters the sewage pipe. When it rains, after the initial rainwater washes the atmosphere and the ground, it takes the ground garbage (such as garbage transfer stations, catering, auto repair, and agricultural waste) into the rivers, lakes and seas through the rainwater pipe, causing non-point source pollution.

The advantage is that it is more convenient to use reclaimed water reuse and change the community to waste diversion in the future.

The disadvantage is that it costs pipes, occupies space, and feels that it is not very practical.

The advantage of the diversion system is that all the sewage plants enter the sewage plant in the dry season and rainy season, and the sewage plant operates stably and efficiently.

The disadvantages are: it is difficult to reconstruct the sewage pipe network of the diversion system in the built-up area; High requirements for management; In the rainy season, the initial rainwater caused by non-point source pollution cannot be collected; Compared with the confluence system, the general investment is higher.

Definition: A system in which domestic sewage, production wastewater and rainwater are discharged in two or more piping systems is called a diversion drainage system.

A system that excludes domestic, industrial, or municipal sewage is called a sewage drainage system; The system that removes rainwater is called a stormwater drainage system. Due to the different ways of draining rainwater, the drainage system of the diversion system is divided into three types: complete diversion system, incomplete diversion system and semi-diversion system.

1. Diversion system: a drainage method that collects and transports various sewage, rainwater and production wastewater with different pipes and canals.

2. Confluence system: a drainage method that collects and transports urban sewage and rainwater with the same pipe and canal. The confluence system is divided into direct discharge type, full treatment type, and interception type.

The diverted sewage goes directly into the sewage treatment plant, and the rainwater is discharged into the natural water system or seepage pit. Two sets of drainage systems are required: rain and sewage. It occupies more underground space on the road, and the cost is higher.

Moreover, the early rain, which has a high degree of pollution, also directly enters the natural water system and causes pollution, and engineering measures should be taken to transform it in the design.

The combined system uses a drainage system in which sewage and part of the rainwater (polluted) enter the sewage treatment plant when there is no rain or light rain. When it rains heavily, rain and sewage are discharged into the natural water system at the same time, causing pollution.

Drainage system refers to the systematic way of collecting, transporting and disposing of sewage (domestic sewage, industrial wastewater, rainwater, etc.).

As far as the drainage system is concerned, there are two types: the confluence system and the diversion system.

1.The confluence system is a system that integrates sewage (waste) water and rainwater. The confluence system is divided into in-line discharge type and interception type, the in-line discharge type directly collects sewage and discharges the water body, and the interception type is to build the interception main pipe near the river, and at the same time, an overflow well is set up before or at the intersection of the confluence main pipe and the interception main pipe, and a sewage treatment plant is set up downstream of the interception main pipe When the flow rate of mixed sewage exceeds the water transmission capacity of the interception main pipe, part of the sewage overflows through the overflow well and is directly discharged into the water body; According to the situation, the confluence system can be divided into three types: in-line confluence system, interception confluence system, and full-treatment confluence system.

2.The diversion system is a system in which sewage (waste) water and rainwater are discharged in two or more pipes and canals, with complete diversion and incomplete diversion, and the complete diversion system has a sewage drainage system and a rainwater drainage system; The incomplete diversion system has not built a stormwater drainage system. In the diversion system, there can also be separate systems for sewage and clean wastewater for easy treatment or reuse.

The combined system is low cost and easy to construct, but it is not conducive to sewage treatment and system management. The split system is expensive but easy to maintain and good for wastewater treatment. The diversion system is a system that discharges domestic sewage, industrial wastewater and rainwater in two or more independent pipes.

According to the different ways of removing rainwater, the diversion system can be divided into three types: complete diversion system, incomplete diversion system and interception diversion system.

What are the specific contents of the characteristics of the combined drainage system and the diversion drainage system, the following Zhongda Consulting will answer for you.

The combined drainage system is to send all urban domestic sewage, industrial wastewater and precipitation to the sewage treatment plant for treatment, which better controls the water pollution, but the capacity of the sewage treatment plant increases a lot, and the construction cost increases accordingly. On sunny days, the sewage is not diverted in the confluence pipeline, and it is close to the full pipe flow on rainy days, so the flow rate in the confluence pipe is low on sunny days, and it is easy to produce precipitation. The amount of water flowing into the wastewater treatment plant on sunny and rainy days varies greatly, increasing the complexity of the operation and management of the sewage treatment plant in the combined drainage system.

The diversion system and drainage system is to send the urban sewage to the sewage treatment plant for treatment, which reduces the scale and construction cost of the sewage treatment plant, but the early rain path is directly discharged into the water body without treatment, and the reputation will cause pollution to the urban water body. However, the diversion system can maintain the flow rate in the pipe, so that precipitation does not occur, and the amount of water and water flowing into the sewage treatment plant is much smaller than that of the combined system, and the operation of the sewage treatment plant is easy to control.

Answer]: From the perspective of environmental protection, if the complete confluence system is used to intercept the urban domestic sewage, industrial wastewater and rainwater to the sewage treatment plant for treatment, and then discharge, it is better to prevent the pollution of the water body, but at this time, the size of the main pipe of the interception is very large, the capacity of the sewage plant is very large, and the construction cost is correspondingly high. When the interception-and-start-start confluence system is adopted, part of the mixed sewage enters the water body through the overflow well during the rainstorm, and the water body is polluted, even to an intolerable level.

The diversion system is to send all the urban sewage to the sewage treatment plant for treatment, but the initial rainwater is directly discharged into the water body without treatment. However, due to the fact that the diversion system is more flexible, easy to adapt to the needs of social development, and generally can meet the requirements of urban sanitation, it has been widely used at home and abroad.

Answer] :d building diversion system refers to the establishment of an independent pipeline system between domestic sewage and domestic wastewater or production sewage and production wastewater. This type of drainage system is often used in the construction of new urban areas and draft areas.

The total length of the pipeline is about 30% 40% larger than that of the combined drainage system, but the pipe diameter is small and the construction and operation costs of the pumping station and sewage treatment plant are small, and the environmental pollution is relatively small.

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The difficulties in transforming the urban confluence drainage system into a sub-flow system are as follows: the definition of the difference between the confluence system and the diversion system: 1. The diversion system

It is a drainage method that collects and transports various sewage, rainwater and production wastewater with different pipes and canals. 2. Confluence system: the drainage method of collecting and transporting urban sewage and rainwater with the same pipe and canal.

The confluence system is divided into direct discharge type, full treatment type, and interception type. Advantages and disadvantages: 1. The diversion system is not limited by the amount of rainwater and water quality, and is only used to treat the most polluted, stable water quality and water quality.

The unfavorable cause of the wheel is to cause a certain amount of pollution to the water body. 2. The confluence system is especially applicable to the drainage system of northern cities with less precipitation and arid and villages and towns with small catchment areas. The disadvantage is that the harm caused to the environment is very serious.

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