Tower earthworm ecological filter tank system

Abstract

Disclosed is a tower earthworm bio-filter system, which is composed of a hydrolysis acidification tank and a multi-stage tower earthworm bio-filter. The hydrolysis acidification tank is a buried tank, the tower earthworm bio-filter employs modes of a modular structure, a gradient tower layer design and multistage units in series connection, and tower layers employ mode combination of a stair type or a rotary type. Inner water distributors are additionally arranged inside an earthworm bed for uniformly distributing water. The drop-aeration technique and the water spray technique are employed to increase the concentration of dissolved oxygen in sewage. The tower earthworm bio-filter system can effectively increase impact load to the sewage, and the surface hydraulic load can reach up to 1m3 / (m2,d). Capability of denitrification and dephosphorization of the system can be largely increased, total nitrogen removal efficiency of the system can be higher than 80% as tested, the total phosphorous removal efficiency can be more than 90%, and discharged water can meet the qualifications of GB8978-1996 national sewage discharge standard. The system is low in project and operation costs and less in accommodation area, can realize automatically controlling of operation, and is adaptable to domestic sewage treatment of relatively concentrated discharge at towns and villages and scenic spots.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a high-load tower-type earthworm ecological filter tank, which can be used for the treatment of relatively concentrated discharge of domestic sewage in vast villages, towns and tourist attractions. Background technique [0002] At present, the application of enhanced ecological technology in the land treatment system has become a hot spot in the field of sewage treatment research and application in the world, but the research is in its infancy in general. The tower-type earthworm ecological filter system mentioned in the present invention is exactly a kind of land treatment system using enhanced ecological technology. It is based on the ecological functions such as earthworms have swallowing organic matter, improving soil ventilation and water permeability, and synergy between earthworms and microorganisms. A multi-layer and multi-stage water distribution ecological sewage treatment system is ...

AI Technical Summary

Problems solved by technology

First of all, it adopts hydrolytic acidification tank as the pretreatment technology according to local conditions, and forms a combined process with the tower-type earthworm ecological filter; secondly, the structure of the tower-type earthworm ecological filter is improved, and the gradient tower layer design is adopted to facilitate the management of the filter , maintenance; thirdly, measures such as combining water distribution on the surface of the filler with internal water distribution on the filler, establishment of a special drainage system, slope design at the bottom of the filter, and cement sealing treatment at the corners are taken to completely solve the uneven water distribution of the system and the actual operation To solve the problem of low hydraulic load, improve the denitrification capacity and drainage capacity of the system; fourthly, adopt falling water aeration technology to increase the concentration of dissolved oxygen in the influent

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