Method for removing phthalates out of water by utilizing UV (ultraviolet)/ozone/chlorella degradation composite process

A technology of phthalates and chlorella, applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem of long time-consuming DMP and shorten the treatment time , save energy and reduce construction costs

Inactive Publication Date: 2011-11-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general, it takes a long time to degrade DMP with chlorella alone

Method used

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  • Method for removing phthalates out of water by utilizing UV (ultraviolet)/ozone/chlorella degradation composite process
  • Method for removing phthalates out of water by utilizing UV (ultraviolet)/ozone/chlorella degradation composite process

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Experimental program
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Effect test

Embodiment 1

[0029] Start with 1mg.L -1 The phthalate-contaminated water was sampled and pre-tested for UV / ozone joint process, and the process parameters were determined to be: UV intensity 135μW.cm -2 , ozone flux 2.0mg.h -1 .L -1 And the treatment time for the removal rate to reach 90% is 30 minutes, so the ultraviolet intensity is 135μW.cm -2 , Ozone inflow rate 2.0mg.h -1 .L -1 The water body is pre-treated for 10 minutes; the pre-treated water is then injected into the 100m 2 The biological redegradation is carried out in the chlorella culture pond of the area, and the chlorella culture density is 1.0×10 7 ~1.0×10 8 ml -1 ; The content of phthalates in the detected water is 0.0074mg.L -1 , discharged into farmland as irrigation water. This process produces 120kg of algae per year, saves 8kW.h of energy compared with the pure UV / ozone process, and shortens the time by 20h compared with the pure biodegradation process.

Embodiment 2

[0031] Start with 2mg.L -1The phthalate-contaminated water was sampled and pre-tested for UV / ozone joint process, and the process parameters were determined to be: UV intensity 135μW.cm -2 , ozone flux 4.0mg.h -1 .L -1 And the treatment time for the removal rate to reach 90% is 30 minutes, so the ultraviolet intensity is 135μW.cm -2 , Ozone inflow 4.0mg.h -1 .L -1 The water body is pre-treated for 10 minutes; the treated water is then injected 100m 2 Bioredegradation is carried out in the chlorella culture pool of the area, and the chlorella culture density is 1.5×10 7 ~1.6×10 8 ml -1 ; The content of phthalates in the detected water was 0.0079mg.L -1 , discharged into farmland as irrigation water. This process produces 130kg of algae per year, saves 16kW.h of energy compared with the pure UV / ozone process, and shortens the time by 20h compared with the pure biodegradation process.

Embodiment 3

[0033] Start with 4mg.L -1 Sampling of phthalate-contaminated water and conduct a pre-test of UV / ozone joint process, and determine the process parameters: UV intensity 202.5μW.cm -2 , ozone flux 6.0mg.h -1 .L -1 And the treatment time for the removal rate to reach 90% is 30 minutes, so the ultraviolet intensity is 202.5μW.cm -2 , Ozone inflow 6.0mg.h -1 .L -1 The water body is pre-treated for 10 minutes (9-12 minutes, take 10 minutes); the treated water is injected into 100m 2 The biological re-degradation is carried out in the chlorella culture pool of the area, and the chlorella culture density is 1.6×10 7 ~1.8×10 8 ml -1 ; The content of phthalates in the detection water is 0.0075mg.L -1 , discharged into farmland as irrigation water. This process produces 130kg of algae per year, saves 30kW.h of energy compared with the pure UV / ozone process, and shortens the time by 21h compared with the pure biodegradation process.

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Abstract

The invention discloses a method for removing phthalate esters in water utilizing an UV (ultraviolet)/ozone/chlorella degradation composite process. The method comprises the following steps of: 1) firstly sampling polluted water containing phthalates, and carrying out UV/ozone combined process pre-test to determine the UV/ozone combined process parameters: UV intensity, ozone introduction amount and the treatment time T when the removal rate of the phthalates in water reaches 90%; 2) pre-treating the polluted water containing phthalates for 0.3-0.4 T by using the UV/ozone combined process under the conditions of the UV intensity and ozone introduction amount; and 3) then injecting the pre-treated water into a chlorella breeding tank and carrying out biodegradation treatment under the action of chlorella. In the method disclosed by the invention, the algae can adapt to the adverse reactions of PAEs (phthalic acid esters) in advance by the UV/ozone pre-treatment, and the metabolic burden in the initial stage of biodegradation treatment is reduced, thereby saving energy, shortening the treatment time and lowering the construction cost. The method is suitable for large-area water source pollution.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for removing plasticizer sewage, that is, sewage containing phthalates. Background technique [0002] A large number of studies have confirmed that human reproductive disorders, developmental abnormalities, certain cancers, immune system, and nervous system diseases are related to environmental endocrine disruptors. Phthalic acid esters (Phthalic acid esters, or Phthalates, referred to as PAEs, also known as phthalates) are one of the most important endocrine disruptors in the water environment. In industry, PAEs compounds are mainly used as plasticizers and softeners for plastic products, and the addition amount in PVC and polyethylene plastic products reaches 20% to 50%. Since PAEs are not polymerized into the plastic matrix, PAEs are released into the environment during production, use and disposal, and cause pollution to the atmosphere, water, soil, crops ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/32C02F1/32C02F1/78C02F101/34
Inventor 赵永富郑正张继彪罗艳郑宾国
Owner NANJING UNIV
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