Cooperatively-intensified denitrifying and dephosphorizing ecological sewage treatment device and water purifying method

Abstract

The invention discloses a cooperatively-intensified denitrifying and dephosphorizing ecological sewage treatment device and a water purifying method. The cooperatively-intensified denitrifying and dephosphorizing ecological sewage treatment device consists of an ecological wetland aeration tank, a water distributing system, an activated sludge aerobic zone and an ecological wetland water purification zone, wherein the water distributing system is arranged at the bottom of the ecological wetland aeration tank; the activated sludge aerobic zone is positioned at the lower part of the ecological wetland aeration tank; the ecological wetland water purification zone is mounted at the top of the ecological wetland aeration tank in a suspended way. The water purifying method comprises the following steps: sewage enters the water distributing system through the bottom of the ecological wetland aeration tank; after uniform water distribution, the sewage enters the activated sludge aerobic zone and the ecological wetland water purification zone sequentially; after sufficient anaerobic, facultatively-anaerobic and aerobic purification in the activated sludge aerobic zone and ecological wetland water purification zone, the sewage reaches the standard and is discharged. The cooperatively-intensified denitrifying and dephosphorizing ecological sewage treatment device combines an ecological wetland and an aeration tank to form the ecological wetland aeration tank, and can achieve synchronous denitrification and dephosphorization while effectively purify water, so that the nitrogen and phosphor removing efficiency is improved, and cooperatively-intensified denitrification and dephosphorization and resource recycle of the sewage are achieved.

Description

technical field [0001] The invention belongs to the field of sewage ecological treatment, and relates to an ecological aeration tank formed by a three-dimensional combination of a biological aeration tank and an artificial wetland and a method for treating sewage by using the same. Background technique [0002] Aeration tank: the core structure of the activated sludge sewage treatment technology, which follows the principle of biochemistry, and uses the rich aerobic and concurrently trophic microbial flora in the suspended activated sludge flocs to adsorb under aerobic conditions. , Absorb and degrade organic pollutants, nitrogen, phosphorus, etc. in the water body to achieve water purification. Activated sludge method is the most traditional process of sewage treatment. It has the advantages of mature technology, reliability and good purification effect of organic matter. It is the preferred technology for urban domestic sewage treatment at home and abroad. The aeration tan...

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Problems solved by technology

[0007] 2. The most common problem in the operation of traditional activated sludge process is sludge bulking. The problem of sludge bulking is often due to the fluctuation of influent water quality, the mismatch of organic matter, nitrogen and phosphorus ratio in sewage, or the lack of dissolved oxygen. The sludge bulking caused by meeting the needs of the biochemical process is due to the single bacterial structure of the aerobic process itself, poor impact load resistance, and poor self-regulation ability. Once the water quality or dissolved oxygen fluctuates, sludge bulking will occur and affect the sewage. The stability of the plant operation

[0008] 3. The traditional aeration tank is generally designed with an upper opening. Dissolved oxygen rises from the bottom in the form of tiny bubbles, is absorbed by activated sludge, absorbed and utilized by aerobic bacteria, and released into the atmosphere at the top. This form of tank body structure, leading to a serious waste of dissolved oxygen, aeration energy consumption has become the largest component of sewage treatment into the operating cost

[0009] 4. For the northern region, the exposed aeration tank dissipates heat quickly in winter, resulting in low temperature of the tank, which is not conducive to the biochemical process. However, if it is covered with heat preservation, the construction cost will be increased, which is not conducive to equipment maintenance

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