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Method for improving sludge predation effect of limnodrilus hoffmeisteri

A waterworm and sludge technology, which is applied in sludge treatment, biological sludge treatment, etc., can solve the problems such as the poor ability of Hough waterworm to prey on sludge, and achieve the effect of enhanced effect and improved sludge reduction efficiency Effect

Inactive Publication Date: 2009-09-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor ability of predating sludge by the existing hydrosophagus hof;

Method used

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  • Method for improving sludge predation effect of limnodrilus hoffmeisteri
  • Method for improving sludge predation effect of limnodrilus hoffmeisteri

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specific Embodiment approach 1

[0008] Specific embodiment 1: The method for improving the effect of Hof worms on sludge in this embodiment is realized according to the following steps: 1. Domestication of Hof worms: The Hof worms are spread in a flat-bottomed acclimation tank, and then Water is injected to make the water depth reach 0.15-0.20m, and the sludge is added to the acclimation tank every day to maintain a constant sludge concentration in the acclimation tank. 2. Optimizing the predation reaction conditions of Hof worms: the domesticated Hof worms were subjected to sludge predation treatment under the conditions of water temperature 25°C, pH value 6.5 and intermittent aeration , the effect of Hof worms preying on sludge is improved; wherein in step 1, the density of Hof worms is to add Hof worms with a wet weight of 2000 g of worms per square meter of pond bottom area; in step 1 The acclimatization time for Hof worms is 15 days; in the first step, the sludge concentration in the sludge mixture is 1...

specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dissolved oxygen in the water in the acclimation tank in step 1 is 4.2-4.8 mg / L. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the dissolved oxygen in the water in the acclimation tank in step 1 is 4.5 mg / L. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method for improving the sludge predation effect of limnodrilus hoffmeisteri, which relates to a method for improving the sludge predation effect of aquatic worms, and solves the problem that the prior limnodrilus hoffmeisteri has poor sludge predation capability. The method comprises the following steps of: 1, acclimatizing the limnodrilus hoffmeisteri; and 2, optimizing predation reaction conditions of the limnodrilus hoffmeisteri. The sludge reduction efficiency of mature limnodrilus hoffmeisteri affected by the method is improved by between 18 and 20 percent than that of mature limnodrilus hoffmeisteri which is not affected by the method; and the sludge reduction efficiency of juvenile limnodrilus hoffmeisteri affected by the method is improved by between 70 and 75 percent than that of juvenile limnodrilus hoffmeisteri which is not affected by the method.

Description

technical field [0001] The invention relates to a method for improving the effect of aquatic worms on sludge. Background technique [0002] At present, sewage treatment plants generally use activated sludge method as the main process. 40% to 60% of sewage BOD will be converted into sludge, and its output accounts for about 0.5% to 1.0% of the total treated water, which is a surprising amount. The treatment and disposal of excess sludge is the focus of the current sewage treatment field. Excess sludge is recognized as a potentially dangerous substance. It contains rich nitrogen and phosphorus nutrients, a large number of pathogenic microorganisms, parasites, concentrated heavy metals such as zinc, copper, lead and cadmium, as well as toxic and refractory organic matter. Improper handling will cause serious environmental problems. The most common disposal methods for existing excess sludge are: sludge landfill method, which has the problems of secondary pollution and occupat...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 田禹张晓琦祁伟
Owner HARBIN INST OF TECH
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