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A kind of method of cyclone recovery diatomite particle in hpb

A diatomite particle, diatomite technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problems of shortening, lack of simple operation control, etc., to avoid accumulation , Overcome the contradiction of denitrification and phosphorus removal bacteria sludge age, the effect of simple operation control

Active Publication Date: 2021-08-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The process of treating wastewater by using high-concentration composite powder carrier biological fluidized bed device (HPB) is transformed, and the current two sets of A / A / O biochemical pools are switched to a single set of operation, which can double the amount of treated water and increase the total residence time. The technical effect is shortened to less than 5.0h. Through the composite powder carrier dosing and the recycling cycle of the carrier and attached microorganisms during the sludge discharge process, the "double sludge age" is realized, which overcomes the contradiction between denitrification and phosphorus removal bacteria sludge age, and improves The efficiency of nitrogen and phosphorus removal is improved, but the process must separate the carrier from the attached microorganisms and suspended microorganisms to realize the recovery cycle of the carrier and the attached microorganisms. In the prior art, there is a lack of simple operation control and effective separation of the carrier and microorganisms.

Method used

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  • A kind of method of cyclone recovery diatomite particle in hpb

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Embodiment 1

[0024] The technical method of present embodiment swirl recovery diatomite may further comprise the steps:

[0025] (1) The effluent of the secondary sedimentation tank containing diatomite particles is removed through the pre-stepped fine grid to remove inorganic impurities; the composite powder carrier is subjected to centrifugation pretreatment with a centrifugal force of 500g and a centrifugation time of 3min; The biofilm attached to the algae earth is effectively gradiently stripped; then, the sludge mixture is sent tangentially from the inlet into the cyclone cylindrical part of the cyclone, and a high-speed rotary motion is formed in the cylinder to generate a centrifugal force field. The diatomite particles with a larger particle size of 55 μm in the lower mixture undergo centrifugal sedimentation, are thrown to the wall of the vessel and lose kinetic energy, swirl downward under the action of gravity, and are discharged through the underflow outlet; the activated sludg...

Embodiment 2

[0030] (1) The effluent of the secondary sedimentation tank containing diatomite particles is removed through the pre-stepped fine grid to remove inorganic impurities; the composite powder carrier is subjected to centrifugal pretreatment with a centrifugal force of 600g and a centrifugal time of 2min; The biofilm attached to the algae earth is effectively gradiently stripped; then, the sludge mixture is sent tangentially from the inlet into the cyclone cylindrical part of the cyclone, and a high-speed rotary motion is formed in the cylinder to generate a centrifugal force field. The diatomite particles with a larger particle size of 50 μm in the lower mixture undergo centrifugal sedimentation, are thrown to the wall of the vessel to lose kinetic energy, swirl downward under the action of gravity, and are discharged through the underflow outlet; the activated sludge particles are of low quality, Under less centrifugal force, it is located in the central area of ​​the cyclone sep...

Embodiment 3

[0035] (1) The effluent of the secondary sedimentation tank containing diatomite particles is removed through the pre-stepped fine grid to remove inorganic impurities; the composite powder carrier is subjected to centrifugation pretreatment with a centrifugal force of 700g and a centrifugation time of 1min; The biofilm attached to the algae earth is effectively gradiently stripped; then, the sludge mixture is sent tangentially from the inlet into the cyclone cylindrical part of the cyclone, and a high-speed rotary motion is formed in the cylinder to generate a centrifugal force field. The diatomite particles with a larger particle size of 55 μm in the lower mixture undergo centrifugal sedimentation, are thrown to the wall of the vessel and lose kinetic energy, swirl downward under the action of gravity, and are discharged through the underflow outlet; the activated sludge particles are of low quality, Under less centrifugal force, it is located in the central area of ​​the cycl...

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Abstract

The invention provides a method for reclaiming diatomite particles in HPB by swirling. The stepped fine grid arranged in front of the cyclone strengthens the separation of inorganic impurities, avoiding the accumulation of inorganic impurities in the biochemical system and the effect on diatomite swirling. Separation interference, change the shape, size and fluid form of the cyclone inlet and outlet, use the shear force of water flow to effectively separate the biofilm attached to diatomite, recycle the composite powder carrier and attached microorganisms, and discharge the suspended growth microorganisms in real time And aged sludge, to realize the recovery and recycling of diatomite particles. The combination of this treatment and the high-concentration composite powder carrier fluidized bed device can achieve "double sludge age", which overcomes the contradiction between denitrification and phosphorus removal bacteria sludge age, and improves the efficiency of nitrogen and phosphorus removal. This enables the HPB effluent water quality indicators to achieve efficient and stable compliance, and provides a new idea for the expansion or new construction of urban sewage treatment plants.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for recycling diatomite particles in HPB by swirling. Background technique [0002] With the rapid development of my country's economic construction and urbanization level, the amount of sewage generated is increasing day by day, and the corresponding sewage collection and treatment rate is also gradually increasing, resulting in a large amount of sludge. According to the "National Urban and Rural Construction Statistical Yearbook" issued by the Ministry of Housing and Urban-Rural Development in 2020 and other relevant statistical data, my country's current designed sewage treatment capacity is 202 million tons per day, and a total of 58.825 billion tons of sewage is treated throughout the year. my country's standards for the quality of effluent from urban sewage treatment plants have been continuously improved. The "Pollutant Discharge Stand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/301
Inventor 柴晓利戴晓虎陆斌
Owner TONGJI UNIV
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