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9.
2.
1.
3 The influence of activated sludge itself on sludge reduction
(1) The nutritional value of different sludge and the influence of unknown components.
Activated sludge and sludge are used as the growth substrate of the earthworms.
When the activated sludge is used as the substrate, the growth rate of the earthworms is the sludge as the substrate.
2 times the time, so the nutrient level of activated sludge is more suitable for the growth of worms
.
Comparing the reduction effect of L.
Studies on the remaining sludge components show that the decomposition of the organic part is the main cause of sludge reduction, which increases the inorganic components in the worm feces, while the protein part of the sludge is the main part of the worm’s digestion, but it is high in protein.
But it is not closely related to high digestion rate
.
The linear regression analysis of the two most common municipal sludge shows that the digestion rate changes and the test time, temperature, worm density, W/S (worm/sludge, based on dry matter), pH and the proportion of ash content of the remaining sludge It is irrelevant and the size of sludge flocs is not a limiting factor for sludge absorption, digestion and worm growth.
(2) The influence of different sludge concentration (TSS) Domestic scholars found that the same sludge with different sludge concentration (TSS), the activated sludge with high concentration was inoculated with earthworms for 1 hour, the sludge volume reduction and the activated sludge settling rate accelerated More significant and effective, the sludge volume can be reduced by 8% to 42% compared to before the addition of earthworms
.
However, through the analysis of the sludge characteristics, the earthworm tremor has little effect on the average particle size and zeta potential of the sludge in a short period of time (1~3h).
(3) The effect of toxic substances in the sludge on the toxic effect of copper ions on earthworms trembling.
The results of the study showed that with the increase of copper concentration, the mortality of earthworms trembling increased significantly, and the toxicity of copper to earthworms had a significant dose-effect relationship.
, The longer the exposure time, the greater the toxicity of copper to earthworms, the greater the exposure concentration, and the higher the degree of bioaccumulation
.
Earthworms have strong tolerance to copper and have a certain bioaccumulation effect
9.
2.
1.
4 Application bottlenecks of worm reduction sludge technology
Although there have been more and more studies on the use of worms to reduce sludge in recent years, most of them stay on the laboratory scale and the continuous operation time is short
.
On the whole, there are technical and economic bottlenecks in the application of the oligochae worm sludge reduction process