With the improvement of people’s living standards, urban sewage has always been a matter of concern, because it directly affects people’s health. So where does all this municipal sewage go? And how do you make sure it’s emitted safely? This chapter water quality online monitoring instrument manufacturers to understand the relevant issues together with you.
Where is the Outlet for the Sewage?
Generally speaking, urban sewage includes domestic sewage, industrial wastewater, stormwater runoff.
· Domestic sewage accounts for the majority, which comes from our daily life(such as washing clothes, kitchen, some rainwater, shopping malls, bathing, etc., will produce sewage)and is transported to the centralized sewage treatment facilities through the drainage network.
· Industrial wastewater comes from concentrated production departments (such as factories, laboratories, industrial parks, etc.), which are generally discharged into the sewage network after benefiting from appropriate water quality and treated together with domestic sewage.
· In addition, rainwater is relatively special, except for rainwater runoff in special areas treated as industrial wastewater, most of them can be divided into two cases: economically developed places, the construction of a separate rainwater pipe network, that is, the rain pollution diversion mode, so that domestic sewage is sent to treatment, rainwater can be treated and discharged; Or do not build a separate rainwater pipe network, the two share the pipe network, and the rain and pollution combined mode, in this mode, there will be no problem in the dry season, the sewage is all sent to treatment, but in the rainy season, due to the surge in water, may exceed the capacity of the pipe network, the excess water will overflow out of the treatment system, because of the mixed part of the sewage, it will form a certain degree of pollution.
Where does this treated water end up? There are three directions:
· Discharge to surface water bodies, which is relatively common! It usually includes discharge into sea water, lakes, rivers and even deserts. There is no need to worry about pollution, and the environmental carrying capacity of the receiving water body is already taken into account when the emission standards are set. But if you secretly emit, you can’t avoid pollution. The “Comprehensive Sewage Discharge Standard” has stipulated the discharge standards of sewage in different occasions.
· Industrial and agricultural utilization, water quality reaches a certain standard, it can be used, such as green irrigation, flushing toilets, car washing, process water, cooling water, boiler supplementary water, etc.
· Groundwater recharge. In some areas, due to the excessive use of water resources, it will lead to groundwater depletion, so it is necessary to recharge and maintain a certain amount of water. Tips: If it involves groundwater, be careful, because the repair of groundwater is much more difficult than the repair of surface water!
How to Ensure the Safe Discharge of Water?
In fact, it is also mentioned above that the sewage should be treated before discharge. But how do we know that the treated water quality index is not exceeding the standard? Can be emitted? This requires the use of water quality online monitoring instrument, through the instrument for real-time monitoring of relevant parameters in the water, observation data qualified before discharge!
