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In various sludge reduction technologies, the energy required by the physical method is relatively large, and the chemical substances that need to be input in the chemical method may cause secondary pollution to the environment.
These two methods have economic and environmental problems
.
The biological method is to introduce the common micro-animals (or aquatic worms) in the aeration tank into the activated sludge process to extend the food chain, and use the principle of natural biological chain to use and reduce the sludge technology through aquatic worms
9.
2.
1.
1 The principle of using worms to reduce sludge
From an ecological point of view, the longer the system’s food chain, the greater the energy loss, and the less energy available for biosynthesis
.
It is generally believed that predation through the food chain of bacteria → protozoa → metazoans is the theoretical basis for biological predation to reduce sludge production, that is, most of the energy is lost to the life activities of organisms when energy is transferred from low to high levels, and energy is generated under certain conditions.
In the study of using worms to reduce the excess sludge, the worms used as the research objects include ciliates in protozoa and oligochaetes and gastropods in metazoa
.
Because the individual ciliates are small and the main food is free bacteria, the effect on sludge reduction is not obvious
Related Links: Current Status and Technical Prospects of China's Sludge Treatment