The flow direction of urban sewage in electric heating pipes?

The flow direction of urban sewage in electric heating pipes?

Water is a necessity for our daily life. The daily work in the city generates a lot of sewage, including daily sewage, industrial wastewater, rainwater runoff, and so on. But where does urban sewage ultimately flow?

1、 Origin of sewage

Sewage generally refers to abandoned water that is subject to certain pollution and comes from daily use and production. In plain English, the water that is not needed or wants to be discarded in a specific situation is sewage.

What makes the originally pure and beloved water lord become turbid and detestable?

The pollutants in water can generally be divided into three categories, namely biological, physical, and chemical pollutants. Biological pollutants include bacteria, viruses, and parasites. So far, there have been many discussions on pathogenic bacteria and parasites, and there are already good inactivation methods. However, the research on pathogenic viruses is not yet sufficient, and there is no recognized standard for virus inactivation requirements. Physical pollutants include suspended solids, thermal pollution and radioactive pollution. During this period, radioactive pollution caused significant damage, but generally existed in local areas. Chemical pollutants include organic and inorganic compound. With the development of trace analysis skills, more than 2500 chemical pollutants have been detected from source water to date.

The water quality goal is what we use to quantitatively describe the water quality. Common water quality targets include COD (chemical oxygen demand), BOD5 (5-day biochemical oxygen demand), ammonia nitrogen, TN (total nitrogen), TP (total phosphorus), pH, coliform bacteria, etc. During this period, COD should be Z, which is widely known. Generally speaking, water quality is introduced abstractly and clearly.

2、 The ultimate outlet for sewage

Generally speaking, urban sewage includes daily sewage, industrial wastewater, and rainwater runoff.

The majority of daily sewage comes from our daily lives (such as bathing, washing clothes, kitchens, some rainwater, shopping malls, units, car washing points, etc.), and is transported through the drainage network to the sewage treatment equipment in the gathering area (i.e. XX sewage treatment plant, which is available in most areas).

Industrial wastewater comes from production departments that gather, such as factories, laboratories, industrial parks, etc. It is generally treated to a suitable water quality before being discharged into the sewage pipe network and treated together with daily sewage.

Rainwater is quite special: Except for the rainwater runoff in special areas treated as industrial wastewater, most of it can be divided into two situations: economically prosperous, build a separate rainwater pipe network, which is a form of rainwater and sewage diversion. In this way, sewage can be sent for treatment, and rainwater can be treated and discharged (in China, there must be pollution in the early rain, but sewage cannot be treated in time, how can we still consider rainwater?); Perhaps not building a rainwater pipe network alone, the two share a common pipe network, which is a form of rainwater sewage confluence. In this form, there will be no problem during the dry season, and all sewage will be sent for treatment. However, during the dry season, due to the surge in water volume, it may exceed the capacity of the pipe network, and excess water will overflow out of the treatment system. Due to the mixing of some sewage here, a certain degree of pollution will be formed. (From this, everyone should also see that water treatment is clearly subject to economic constraints.)

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