Multistage aeration biofilter for water quality purification and purification technique thereof

Abstract

The invention relates to a multistage aeration biofilter for water quality purification. The multistage aeration biofilter comprises a preliminary filter set, a filter tank body and a membrane bioreactor which are sequentially connected in series through water pipes, wherein the filter tank body comprises a plurality of reaction regions which are sequentially connected in series; the primary reaction region adopts an upflow mode by which water flows in from the lower end and flows out from the upper end; the secondary reaction region adopts a downflow mode by which water flows in from the upper end and flows out from the lower end; all the reaction regions alternately adopt the upflow mode and downflow mode; and each reaction region is an anoxic region or aerobic region, the primary reaction region is an anoxic region, and the final reaction region is an aerobic region. The invention also relates to a purification technique of the multistage aeration biofilter for water quality purification. The multistage aeration biofilter for water quality purification has reasonable and compact structural design. The purification technique has the advantages of simple process and favorable purification effect, and is efficient, convenient, green and environment-friendly.

Description

technical field [0001] The invention relates to a multistage aerated biological filter for water purification and its purification process. Background technique [0002] With the rapid development of my country's economy and the continuous increase of population, the degree of pollution of domestic sewage and industrial wastewater has gradually deepened, becoming one of the main reasons for water pollution in my country. The "China Water Environment Bulletin" (2015) shows that 968 state-controlled surface water monitoring sections (points) in 423 major rivers and 62 key lakes (reservoirs) across the country have carried out water quality monitoring, Ⅰ, Ⅱ, Ⅲ, Ⅳ 3.4%, 30.4%, 29.3%, 20.9%, 6.8%, and 9.2% of sections with water quality below Grade Ⅴ and Grade Ⅴ respectively. The main pollution indicators are chemical oxygen demand (COD), etc., which shows the reduction of sewage discharge and the restoration of polluted rivers. The problem urgently needs attention. [0003] Th...

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Problems solved by technology

[0003] The traditional sewage treatment process can no longer meet the needs of today's environmental protection, for example: with A 2 Although the activated sludge method represented by methods such as / O, oxidation ditch and SBR has a good and stable treatment effect, it has disadvantages such as large floor area, high energy consumption, odor and unsightly appearance to varying degrees; Although the traditional biofilm method has the characteristics of small footprint, no sludge discharge and good treatment effect compared with the activated sludge method, the amount of treated water is extremely limited, and the treatment effect on nitrogen pollution is not good enough.

At the same time, the first-level A standard of the urban sewage treatment plant pollutant discharge standard (GB18918-2002) formulated by our country only meets the V-class water standard of the surface water environmental quality standard (GB3838-2002), that is, the water treated by the sewage treatment plant Discharging into natural water bodies will also pollute natural water bodies, so it is necessary to develop a sewage treatment process with better treatment effect to solve such problems

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