Wood filler earthworm biofilter and method for processing town residue sludge

Abstract

The invention relates to a wood filler earthworm biofilter and a method thereof for processing town residue sludge. The wood filler earthworm biofilter comprises a taper-shaped water distributor (2) in which porous spherical filler (2) is arranged, 3-5 stages of filter bed reactors in which wood filler (8) and eisenia foetida (6) are filled, and a settling pond from top to bottom, wherein the upper part of the settling pond is provided with a supernate return pipe (10); and the bottom of the settling pond is provided with a sludge discharging pipe (13). After the residue sludge in the secondary settling pond behind a biological reaction pond enters a sludge conditioning pond to be diluted, the residue sludge is pumped into the taper-shaped water distributor by a peristaltic pump; after being evenly distributed, the residue sludge enters the filter bed reactor; after the residue sludge is eaten and digested by the eisenia foetida (6), and is subjected to actions, such as microbial decomposition and the like to realize residue sludge reduction and stabilization processing; finally, the residue sludge is discharged into the settling pond in the eisenia foetida sludge mode; after the eisenia foetida sludge is condensed and naturally dried, the eisenia foetida sludge can be used as soil amendment; the supernate in the settling pond returns to the biological reaction pond via the return pipe (10) to be recycled in the secondary settling pond.

Description

technical field [0001] The invention relates to a wood filler earthworm biofilter structure, and further relates to a method for using it for treating surplus sludge in villages and towns. Background technique [0002] Environmental governance and protection in villages and towns is an important task in the critical period of building a harmonious society and building a new socialist countryside in our country. The output of mud is also increasing constantly, and its processing and disposal problems are becoming more and more prominent. If the remaining sludge is not properly treated and disposed of, it will cause serious pollution to the natural environment such as water bodies and land in villages and towns, threatening the safety of water sources and the living environment. [0003] Based on the economic and technological level, infrastructure, environmental conditions and natural conditions of the development of villages and towns in my country, due to the high cost and...

AI Technical Summary

Problems solved by technology

[0006] 1. Filling selection is unreasonable

On the one hand, ceramsite has a high packing density, and its surface is rough, which wears heavily on the body wall of earthworms, which is not suitable for earthworms to grow in the filter tank. Low, poor connectivity, which limits the density of earthworms in the filter bed

[0007] 2. Poor water distribution uniformity

The above-mentioned filter is not equipped with a special water distributor, and the uniformity of water distribution is poor, which reduces the effective use of space for the filter bed

[0008] 3. The earthworm feeding density of the earthworm biofilter in the above design is 1.13×10 5 Bar / m 3 , the weight of each earthworm is about 0.3g, and its organic load is 35-65gVSS / (kg earthworm·d), which is only 1.0-1.9kgVSS / (m 3 d), the average volume load is 1.45kgVSS / (m 3 d), and the volume load of conventional aerobic digestion in the "Outdoor Drainage Code" (GB50014-2006) is 0.7-2.8kgVSS / (m 3 d), the average volume load is 1.75kgVSS / (m 3 d) Compared with the lack of competitive advantages, the promotion of this technology is limited

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