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

A technology of biological density and bulking sludge, applied in the direction of sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc. Loose mud structure and other problems, to achieve the effect of preventing sludge stratification

Inactive Publication Date: 2016-11-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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Embodiment 1

[0019] 1. Determine the basic parameters of expanded sludge: the average mixed liquid suspended solids concentration (MLSS) is 2800mg / L, and the average sludge volume index (SVI) value is 320mL / g;

[0020] 2. Take 3.5L of the sludge sample from the reactor where sludge expansion has occurred. After centrifugal solid-liquid separation, wash it three times with the filtered reactor effluent, then dilute it to 3.5L and place it in 7 1L on average. Among the Erlenmeyer flasks, No. 1-7 Erlenmeyer flasks.

[0021] 3. Add 0.04g, 0.08g, 0.12g, 0.16g, 0.2g, 0.24g, 0.28g iM16K glass microspheres (3M company, density 0.46g / mL) into 7 conical flasks, and stir with magnetic force. The device was stirred at room temperature for 10 minutes at 200 rpm until the mud sample and the microspheres were evenly mixed, and the combination of microspheres and sludge ( figure 1 ), it is found that the combination is very tight and the next step of the test operation can be carried out.

[0022] 4. Prepare DM...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00C02F3/12
CPCC02F3/12G01N33/00Y02W10/10
Inventor 高春娣李任飞焦二龙田烨樊士信彭永臻
Owner BEIJING UNIV OF TECH
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