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Method for achieving short-cut denitrification by continuous flow sewage treatment system

A technology for system implementation and biological treatment of sewage, applied in the direction of aerobic and anaerobic process treatment, can solve the problems of complex operation and regulation, difficult short-range denitrification, etc., and achieve the goals of reducing costs, saving carbon sources, and reducing sludge generation Effect

Active Publication Date: 2014-06-04
山西国环环境科技有限公司
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Problems solved by technology

The present invention is about how to realize short-range denitrification in the sewage biological denitrification and phosphorus removal system. Because the system also has the function of phosphorus removal, the operation regulation is more complicated, and it is more difficult to realize short-range denitrification

Method used

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  • Method for achieving short-cut denitrification by continuous flow sewage treatment system
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  • Method for achieving short-cut denitrification by continuous flow sewage treatment system

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Embodiment

[0041] Example: using as figure 1 The continuous flow system shown treats actual domestic sewage from a septic tank in a residential area. Its water quality indicators are: COD concentration 85-268mg / L, NH 4 + -N concentration is 50~103mg / L, pH value is 7.1~7.4, C / N average is 2.5. The inoculum sludge was taken from the return sludge of the secondary settling tank of an urban sewage treatment plant in Beijing, which belongs to the whole process of denitrification sludge. The water temperature in the reactor is controlled at 25±1°C. The concentration of mixed liquid suspended solids (MLSS) in the reactor is (3500±500) mg / L. Run according to the control method of the above three stages, and run for a total of 60d. The influent flow rate is 8.10L / h, the reflux rate and reflux ratio of nitrifying liquid are 16.20L / h and 200% respectively, the sludge reflux rate and reflux ratio are 4.86L / h and 60% respectively, and the total hydraulic retention time (HRT) HRT is 8.74h, hypox...

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Abstract

The invention discloses a method for achieving short-cut denitrification by a continuous flow sewage treatment system, and belongs to the field of biological sewage treatment. The short-cut denitrification is an economical and efficient biological sewage nitrogen removal method, and is achieved in an intermittent denitrification treatment system at present, but is difficultly achieved by most of continuous flow treatment systems for nitrogen and phosphorus removal in practical application due to the complexity of operation and control. By adopting the continuous flow nitrogen and phosphorus removal system for processing domestic sewage, the short-cut denitrification is achieved by controlling the sludge return ratio, the nitrated liquid reflux ratio and the hydraulic retention time of an aerobic zone under the operation condition that the dissolved oxygen concentration at normal temperature is 1-2mg / L, the accumulation rate of nitrite is stably maintained at 90%, the ammonium-nitrogen removal rate can be up to over 95%, and the total phosphorus removal rate can be up to over 90%. By adopting the method, the problem that the short-cut denitrification is applied to the biological sewage nitrogen and phosphorus removal system for the continuous flow in the past is solved, the application range of the short-cut denitrification is expanded, and the method can be used for guiding the biological sewage nitrogen and phosphorus removal system for the continuous flow to achieve operation and control of the short-cut denitrification.

Description

technical field [0001] The invention relates to a method for realizing short-range denitrification in a continuous flow sewage biological treatment system, which belongs to the field of sewage biological treatment. Background technique [0002] Eutrophication of water body has become a global water environment problem, one of the main reasons is the excessive discharge of nitrogen and phosphorus nutrients. In order to control the destruction of the ecological balance of natural water bodies by the excessive discharge of nitrogen and phosphorus nutrients, many countries strictly limit the amount of nitrogen and phosphorus discharged into natural water bodies. The "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) formulated by our country puts forward stricter requirements on the discharge indicators of nitrogen and phosphorus. Among them, the first-level discharge standard (A standard) stipulates that the concentration of ammonia nitrogen should...

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Application Information

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IPC IPC(8): C02F3/30
Inventor 曾薇白鑫龙张丽敏彭永臻
Owner 山西国环环境科技有限公司
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