Method for estimating difficulty of biological nitrogen and phosphorus removal in wastewater treatment
A biological denitrification and sewage treatment technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, anaerobic digestion treatment, etc., can solve problems such as difficulty in reflecting and judging the difficulty of effluent
Inactive Publication Date: 2014-01-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology
It is difficult to reflect the potential carbon source competition relationship between denitrifying bacteria and phosphorus accumulating bacteria by using a single carbon-nitrogen ratio or carbon-phosphorus ratio.
In addition, the evaluation of carbon-nitrogen ratio and carbon-phosphorus ratio only considers the total nitrogen and total phosphorus in sewage, and cannot judge the difficulty of water meeting different discharge standards (level 2, level 1 B, and level 1 A)
Method used
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Embodiment 1
[0069] A method for evaluating the difficulty of biological nitrogen and phosphorus removal in sewage treatment, specifically comprising the following steps:
[0070] (1) Determination of the sewage to be treated, that is, the total nitrogen TN of the influent 0 , total phosphorus TP 0 and BOD 5 value;
[0071] (2) Determine the effluent total nitrogen TN required by the discharge standard according to the discharge standard implemented by the sewage treatment plant S and total phosphorus TP S value;
[0072] (3) According to the design or operation data of the sewage treatment plant, the sludge age is determined, and the net production rate coefficient of denitrifying bacteria is calculated by the following formula
[0073]
[0074] In the formula, the endogenous attenuation coefficient of denitrifying bacteria k dn and yield coefficient Y The values are 0.15d respectively -1 and 0.40gVSS / gCOD;
[0075] SRT is sludge age, d;
[0076] (4) Calculate and determin...
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The invention discloses a method for estimating difficulty of biological nitrogen and phosphorus removal in wastewater treatment. The method includes: measuring total nitrogen TN0, total phosphorus TP0 and BOD5 in wastewater to be treated; determining effluent total nitrogen TNS and total phosphorus TPS required in emission standard to calculate theoretical carbon source demand CS according to the emission standard executed by sewage treatment plants. The ratio of the theoretical carbon source demand CS to wastewater BOD5 concentration is DNR (difficulty of nitrogen removal) in biological nitrogen and phosphorus removal in wastewater treatment. The method can be used to quickly estimate carbon source supply for wastewater treatment so as to determine the difficulty of nitrogen and phosphorus removal for wastewater according to quality parameters of conventional inflow. In practical operations by sewage treatment plants, corresponding treatment schemes are determined according to the estimation results. Especially for DNR larger than 1 in sewage treatment plants using additional carbon sources to aid in nitrogen and phosphorus removal, the method can be used to determine critical carbon source demand.
Description
technical field [0001] The invention relates to an evaluation method for the difficulty of biological nitrogen and phosphorus removal in sewage treatment, and belongs to the technical field of environmental protection and rational utilization of water resources. Background technique [0002] In recent years, the problem of eutrophication in China's water bodies has become increasingly serious, and nitrogen and phosphorus are the main pollutants that cause water quality to exceed the standard. With the increasing eutrophication of water bodies and the stricter sewage discharge standards, nitrogen and phosphorus removal technology has become a hot and difficult point in current sewage treatment. During the "Twelfth Five-Year Plan" period, it is estimated that the new urban sewage (including industrial wastewater) treatment capacity will reach 70 million m 3 / d or above, the upgrading and new construction of urban sewage treatment plants must meet the requirements of nitrogen ...
Claims
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IPC IPC(8): C02F3/28C02F3/34
Inventor 周振邢灿唐建国张爱平安莹王罗春
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER