Method and system for enhancing sludge air flotation concentration reduction and harmlessness by utilizing ozone

An air flotation and sludge technology, which is applied in the direction of oxidation treatment of sludge, chemical instruments and methods, sludge treatment, etc., can solve the problems of low sludge concentration efficiency, high moisture content of concentrated sludge, and a large number of metal catalysts. Achieve the effects of reducing the risk of secondary pollution, reducing material consumption costs, and improving energy consumption and costs

Pending Publication Date: 2022-04-08
TONGJI UNIV +2
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Problems solved by technology

[0006] The purpose of the present invention is to solve the current problems of low sludge concentration efficiency, high moisture content of concentrated sludge, large amount of concentration agent dosing, large amount of metal catalysts or applied voltage, high energy consumption and high cost during ozone concentration, and provide a Using high-concentration ozone to strengthen sludge air flotation concentration reduction and harmless method and system

Method used

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  • Method and system for enhancing sludge air flotation concentration reduction and harmlessness by utilizing ozone

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Embodiment 1

[0044] like figure 1 , a system that uses high-concentration ozone to strengthen sludge air flotation concentration reduction and harmlessness, the system includes a gas-liquid mixing pump installed on a flat base with wheels, a pressure dissolved air tank, an air flotation concentration tank, and a slag scraper , Circuit control panel 02, the whole set of equipment can move smoothly;

[0045] The gas-liquid mixing pump and its base 03 are set on the movable flatbed 04, the outlet is connected to a piston, and then vertically connected to the bottom inlet 011 of the pressure dissolved gas tank;

[0046] The pressure dissolving gas tank is oval, with an outlet at the bottom and an upper part, the upper and lower ends of the bottom are hollow hemispheres, the middle part is a hollow cylinder, and the upper part is connected with a pressure gauge, an air release valve integrated device 01 and a gas collection device 015 ;

[0047] The air flotation concentration pool 017 is a c...

Embodiment 2

[0058] A method of utilizing high-concentration ozone to strengthen sludge air flotation concentration reduction and harmlessness, the steps are as follows:

[0059] (1) Mix the mixed powder of polyacrylamide powder and polyaluminum chloride with birnessite (MnO 2 ) powder is mixed at a mass ratio of 10:1 to become an air-flotation concentrated medicament;

[0060] (2) Add 0.5‰ of air flotation concentration agent in sludge dry weight to the sludge with 98% water content and 30% mass ratio of volatile solids to total solids, mix in the air flotation concentration tank and pass through the gas-liquid The mixing pump enters the pressure container tank, and the high-concentration ozone (300mg / L) with a total dose of 1mg / g sludge dry weight passes through the micro-nano bubble generation unit to generate micro-nano bubbles with a diameter of 1um, and then enters the pressure container tank through the gas-liquid mixing pump , so that the sludge, air flotation concentration agent ...

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Abstract

The invention relates to a method for enhancing sludge air flotation concentration decrement and harmlessness by using high-concentration ozone, which comprises the following steps: mixing sludge and an air flotation concentration medicament, feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles by ozone through a micro-nano bubble generating unit, feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, and discharging the micro-nano bubbles. Uniformly mixing the sludge, the air flotation concentration medicament and the high-concentration ozone; pumping the mixed solution into an air floatation contact chamber, and after air floatation, opening a slag scraping plate to remove floating concentrated sludge; all the concentrated sludge floats upwards and is discharged through a sludge outlet after being removed by a slag scraping plate, and sludge supernate after air floatation is disinfected and then is discharged through a concentrated water outlet guide pipe as bottom effluent. On the premise of greatly reducing the consumption of ozone, the water content of the concentrated sludge is quickly increased to 90-92%, the air flotation concentration efficiency is greatly improved, most antibiotic pollutants and pathogenic bacteria in the supernate are removed, the chromaticity of the supernate is reduced, and sludge reduction and harmlessness are remarkably enhanced.

Description

technical field [0001] The invention relates to the field of sludge reduction and harmless treatment, in particular to a method and system for enhancing sludge air flotation concentration reduction and harmless treatment using high-concentration ozone. Background technique [0002] In the sewage treatment industry, the conventional activated sludge method is the most widely used sewage treatment method, but produces a large amount of sludge. Sludge has high moisture content, complex composition, and contains heavy metals, pathogens, and persistent organic pollutants, which pose a threat to environmental safety and human health. General sludge treatment refers to the process in which sludge is reduced, stabilized and harmless through processes such as concentration, digestion, dehydration, composting, and drying. In the subsequent treatment and disposal of sludge, it needs to be concentrated first to remove part of the water to reduce its volume, reduce the compliance of sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/148C02F11/06
Inventor 董滨陈思思吴海斌王殿常李翀王先恺王航
Owner TONGJI UNIV
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