Treatment method for deeply dephosphorizing and denitrifying domestic sewage

Abstract

The invention discloses a treatment method for deeply dephosphorizing and denitrifying domestic sewage. The treatment method comprises the following steps of firstly cultivating nitrobacterium and sequentially carrying out three steps of: adsorption step: continuously injecting the domestic sewage into an intermittent biological filter reactor (1) containing a biochemical filter filler (2), controlling hydraulic retention time within 1-2h, and stopping feeding water till the nitrogen concentration of discharged water continuously excesses 1mg / L for 2h; regeneration step: emptying water in theintermittent biological filter reactor (1), and blasting from the bottom of the intermittent biological filter reactor (1); and washing step: spraying water to the intermittent biological filter reactor (1) after finishing a blasting operation, collecting sprayed water by an elution collecting tank (6), and carrying out denitrification denitrifying treatment in the elution collecting tank. Sewagetreated by the treatment method disclosed by the invention can meet requirements of landscape water or industrial circulating cooling water; and the treatment method disclosed by the invention has the advantages of low energy consumption and treatment cost, and can synchronously realize dephosphorizing and denitrifying treatments.

Description

1. Technical field [0001] The invention relates to a sewage treatment method, in particular to a treatment method for deep phosphorus and nitrogen removal of domestic sewage. 2. Technical background [0002] my country is one of the 13 countries with insufficient water resources in the world. The per capita fresh water resources are less than 1 / 4 of the world's average level, and the distribution of time and space is uneven. Among the more than 600 cities in China, more than half of them suffer from varying degrees of water shortage, and one fifth of the cities suffer from severe water shortage. At the same time, my country is also one of the countries with the most serious waste of water resources, and the sewage reuse rate is less than 5%. Therefore, the realization of sewage resources is of great strategic significance to ensure the safe water supply of cities. However, economy and safety are the prerequisites for realizing the utilization of sewage resources. Although...

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Problems solved by technology

At the same time, my country is also one of the countries with the most serious waste of water resources, and the sewage reuse rate is less than 5%.

[0007] 3. The biological aerated filter filler can only convert the ammonia nitrogen in the water into nitrate nitrogen, and the removal rate of total nitrogen is not high

On the one hand, it needs to consume the chemical agents that precipitate phosphorus, on the other hand, the removal rate of phosphorus is generally not high, and it is necessary to build a filter with backwashing function

The biggest problem is that it can only remove phosphorus, but cannot simultaneously remove nitrogen while removing phosphorus

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