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2 Environmental factors affecting the stability of worm reduction sludge
Two kinds of worms that have been studied more at present are earthworm tremor and worm worm
.
Earthworms, aquatic, oligochaete, and Tubi-ficidae are widely found in the sediments of natural water bodies, and are indicator organisms for organic pollution and eutrophic water bodies
Table 9-5 General characteristics of the two worms
The environmental factors that affect the stability of worm reduction mainly include the structure and operation of the worm reactor, light, and sludge characteristics
.
(1) Worm reactor structure and operation mode The research on the worm reactor structure mainly focuses on the study of the carrier filler to which the worm is attached.
The commonly used fillers and carriers are mainly shown in Table 9-6 and Table 9-7; the operation method is traditional The activated sludge process mainly considers whether the remaining sludge (containing worm metabolites) after being ingested by the worms is returned to the activated sludge system
Nylon wire mesh is used as the carrier of the trembling earthworm, with a pore diameter of 350μm.
The layout of the worm reactor and carrier is shown in Figure 9-7
.
The head of the worm is buried in the sludge, and the tail extends from the wire mesh to excrete feces and breathe.
Table 9-6 Fillers attached to worms
Table 9-7 Carriers attached to worms
TSS reduction = (organic content in sludge-organic content in feces) / (1-organic content in feces)
Investigate whether the sludge containing earthworm metabolites (mineralized products) is returned to the sewage treatment system and whether it has an impact on the sewage treatment system
.
The experiment adopts the traditional activated sludge process as shown in Figure 9-7, and the schematic diagram of the worm reactor is shown in Figure 9-8
Figure 9-7 The flow of the worm reduction sludge experimental device
The hydraulic retention time (HRT) of the activated sludge system is 0.
56~0.
79d, the sludge age (SRT) is 18d, and the average organic loading rate is 0.
16gCOD/(gTSS·d)
Table 9-8 Effluent indicators of activated sludge treatment system
Note: The value in brackets is the standard deviation
.
(2) Illumination Compare the conditions of complete light (24h per day), no light (complete darkness per day 24h) and natural light (the ratio of daily light to darkness is 16:8).
No light can affect the sludge feeding rate and pollution.
Figure 9-8 Schematic diagram of the new terminal worm reactor and carrier
(3) The effect of activated sludge on the sludge reduction effect of worms.
Earthworms are fixed on the carrier.
Table 9-9 Sludge feeding rate on different sludge unit carrier surface area
Note: ww represents the wet weight of the worm
Related link: The effect of worms on activated sludge microbial community structure