Method for accurate compensation of domestic sewage cod and/or bod

Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a domestic sewage COD (Chemical Oxygen Demand) and / or BOD (Biochemical Oxygen Demand) accurate compensation determination method. The method comprises the following steps of using measurement data of a domestic sewage COD and / or BOD rapid determinator; COD=COD1+COD2; COD is equal to an expression as described in specification; BOD=BOD1+BOD2; BOD2 is equal to an expression as described in specification, wherein COD is the total COD value of the domestic sewage, COD1 is the COD value of the filtered water sample,the numerical value of COD1 is the measurement value of the sensor, and COD2 is the contribution value of suspended solids to COD; wherein BOD is the total value of BOD in domestic sewage, BOD 1 is the BOD value of the filtered water sample, the numerical value of BOD 1 is converted by the COD value of the sensor and verified by a five-day biochemical method, and BOD 2 is the contribution value of suspended solids to BOD; xi is the COD value of the suspended matter, and i is the number of times of measurement; and a1, b1, a2 and b2 are adjustment coefficients. According to the method, the numerical value of the conventional water sample can be calculated by substituting a formula, and compared with the traditional method, operation is simple, and efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for accurately compensating and measuring domestic sewage COD and / or BOD. Background technique [0002] Chemical Oxygen Demand (Chemical Oxygen Demand referred to as COD) and Biochemical Oxygen Demand (Biochemical Oxygen Demand referred to as BOD) are two important indicators in water quality environmental monitoring. The traditional determination methods are the dichromate method and the five-day biochemical method. These two experiments need to bring the water sample back to the laboratory for testing. The COD adopts the dichromate method and is titrated after two hours of heating and reflux; Cultivate at a constant temperature of 20°C for five days, the measurement period is long, and the operation is complicated, which is increasingly difficult to meet the needs of the environmental monitoring department. Portable instruments are also single-item, or dire...

AI Technical Summary

Problems solved by technology

[0004] Since the composition of water samples varies greatly, the influence of suspended solids in water on COD and BOD is also different, and the influence of turbidity on the detection results of sensors cannot achieve satisfactory measurement results through simple compensation calculations. Therefore, the currently commercially available COD Because the sensor is affected by the turbidity in the water to be measured and the suspended matter itself contributes to COD, the measurement error is relatively large in actual use, and the COD and / or BOD value of the water cannot be accurately measured.

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