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Method for recycling diatomite particles in HPB through rotational flow

A technology of diatomite particles and diatomite, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problems of lack of simple operation control and shortening, and achieve the goal of overcoming degassing Effects of conflicting sludge age between nitrogen and phosphorus removal bacteria, avoiding accumulation, and simple device structure

Active Publication Date: 2020-12-15
TONGJI UNIV
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  • Abstract
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  • 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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  • Method for recycling diatomite particles in HPB through rotational flow

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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 to lose kinetic energy, swirl downward under the action of gravity, and are discharged through the underflow outlet; the activated sludge...

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 quality of activated sludge particles is low, Under less centrifugal force, it is located in the central area of ​​the cyclone sepa...

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 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 cyclo...

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Abstract

The invention provides a method for recycling the diatomite particles in HPB through rotational flow. Inorganic impurity separation is enhanced through a stepped fine grid arranged in front of a cyclone, accumulation of inorganic impurities in a biochemical system and interference to diatomite rotational flow separation are avoided, and the shape, size and fluid form of an inlet and an outlet of the cyclone are changed. Effective gradient separation is carried out on a biological membrane attached to a diatomite by utilizing water flow shearing force, a composite powder carrier and attached microorganisms are recycled, suspended growth microorganisms and aged sludge are discharged in real time, and recycling and cyclic utilization of diatomite particles are realized. The treatment is combined with a high-concentration composite powder carrier fluidized bed device to achieve double sludge ages, so that the contradiction between the sludge ages of denitrification bacteria and dephosphorization bacteria is overcome, and the denitrification and dephosphorization efficiency is improved. Therefore, the quality index of the HPB effluent can reach the standard efficiently and stably, and anew thought is provided for upgrading and expanding or newly building an urban sewage treatment plant.

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 Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/301
Inventor 柴晓利戴晓虎陆斌
Owner TONGJI UNIV
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