Method for determining biological density of expanded sludge by low density microsphere method

Abstract

A method for determining biological density of expanded sludge by a low density microsphere method relates to the field of sludge biological treatment. The method comprises the following steps: carrying out solid-liquid separation on expanded sludge with a loose structure, washing and diluting to original volume, and equally dividing into at least six parts; adding different mass gradients of low-density glass microspheres into the equally-divided sludge samples, stirring at normal temperature until the sludge samples and the microspheres are uniformly mixed and tightly combined; preparing different densities of DMS standard solutions; respectively placing 1 mL of the microsphere sludge sample mixed liquor sample into at least 3 mL of three DMS standard solutions with critical density, shaking up and standing; observing positions of the samples to obtain biological densities of various samples respectively being Rho 1 to Rho n; and carrying out data arrangement and analysis on biological density of the samples and mass of added microspheres, and calculating original biological density of loose sludge without microspheres. By the method, the floc structure of the expanded sludge is more compact, and the expanded sludge can be prevented from being layered during the determination process due to the loose structure.

Description

Technical field [0001] The invention relates to the field of sewage biological treatment, and provides a low-density microsphere method for measuring the biological density of expanded sludge, which can measure the biological density of expanded sludge with loose structure, and the method can make the structure of expanded sludge flocs more compact It can prevent the sludge layering problem in the measurement process due to the loose structure of the expanded sludge, and provide an optimized solution for the measurement of the biological density of the loosely structured expanded sludge. Background technique [0002] The problem of sludge expansion has always been a common problem in various sewage treatment plants at home and abroad that use the activated sludge process to treat sewage. The characteristics of sludge expansion include high universality, serious harm, and a large amount of sludge loss will lead to system treatment. A sharp drop in the effect will cause the system ...

AI Technical Summary

Problems solved by technology

[0002] The problem of sludge bulking has always been a common problem in domestic and foreign sewage treatment plants of various sizes that use the activated sludge process to treat sewage. The characteristics of sludge bulking include high prevalence and serious hazards. A large amount of sludge loss will lead to system treatment. The sharp decline of the effect will lead to the collapse of the system in severe cases. Once it occurs, it will be difficult to control and it will take a long time to recover

[0004] However, due to the loose structure of some bulky sludge, the phenomenon of sludge stratification will occur in the routine measurement process, which makes it impossible to measure the biological density of it.

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