There are 32 sewage treatment plants in Shenzhen, with a total design scale of 5.435 million tons / day.
How much sludge is produced by these sewage projects?
The amount of sludge produced by these sewage treatment plants averages 2680 tons per day over four years.
At the same time, the sludge volume of several sewage treatment plants has fluctuated greatly.
If it is increased, it is better to understand, for example, the expansion of sewage treatment plants or upgrades will cause a large increase in the amount of sludge.
Oddly, the sludge volume of several sewage treatment plants has been greatly reduced.
If the "Announcement" data is completely true, then it is very likely that the factory sludge has changed.
For example, the belt type dewatering machine was changed to a plate and frame filter press, which resulted in a reduction in sludge moisture content and a reduction in sludge volume.
This is not difficult to understand, but what is the significance of this "Notice" data that is not classified or remarked and cannot be compared or monitored?
In addition, we also found that the sludge volume in Shenzhen is not growing steadily like GDP.
With reference to the amount of sludge in Xi'an, an increase of 1.91% in 2017 compared to 2016 was also decoupled from GDP.
In my opinion, the factors that may be important are rainfall, population, and sewer network, and these factors are not completely linked to GDP.
Many important factors are not positively related to GDP. Decoupling is a natural thing.