Physicochemical combination process based on recycling treatment of chlorella aging liquid

A combined process and aging solution technology, applied in the field of water treatment, can solve the problems of low utilization efficiency, bacterial pollution, high treatment cost, etc., and achieve the effect of improved effect and strong oxidation capacity

Active Publication Date: 2019-03-29
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The biological method to treat the aging liquid of chlorella culture is greatly affected by environmental conditions, the treatment period is long, and it is easy to cause bacterial pollution in the process of algae culture; in recent years, chemical methods such as advanced oxidation and physical methods such as activated carbon adsorption and membrane separation have been used in wastewater. The application of treatment is becoming more and more widely. The treatment process of this kind of method is relatively simple and the treatment speed is fast. It is a beneficial choice for the recycling and reuse of aging liquid. However, this kind of method has certain limitations when used alone, such as low utilization efficiency and difficult regeneration. , high processing costs, and strong selectivity of reactions with organic matter, etc., so it is necessary to improve this kind of physical and chemical technology and improve and effectively combine it to achieve selective and efficient purification and recycling of Chlorella aging liquid

Method used

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  • Physicochemical combination process based on recycling treatment of chlorella aging liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Measure 500mL of chlorella aging solution provided by Cibai Enterprises, pump it into the ozone reaction tank, add 5mL of 30% hydrogen peroxide, set the ozone concentration at 6.5mg / L, and react for 30-60 minutes, the content of inhibitor fatty acids decreased 34%, pump the waste liquid into the coagulation sedimentation tank, adjust the pH to 6-6.5, and add 5 mg of composite flocculant (inorganic composite flocculant polymerized ferric magnesium sulfate and organic polymer flocculant polyacrylamide according to the ratio of 1:3 mass ratio compound), after mixing at a speed of 300r / min for 30s; stirring at a speed of 350r / min for 2min; stirring at a medium speed of 100r / min for 10min, stirring at a slow speed of 60r / min for 20min, and reprecipitating for 30min. A further reduction of 52%; the effluent enters the medium nutrient salt online monitoring and replenishment system, online monitoring of all anions and cations in the medium formula, it is measured that iron and ...

Embodiment 2

[0027] Measure 500mL of chlorella aging solution provided by Cibai Enterprises, pump it into the ozone reaction tank, add 5mL of 30% hydrogen peroxide, set the ozone concentration at 6.5mg / L, and react for 30-60 minutes, the content of inhibitor fatty acids decreased 34%, pump the waste liquid into the coagulation sedimentation tank, adjust the pH to 6-6.5, and add 5 mg of composite flocculant (inorganic composite flocculant polymerized ferric magnesium sulfate and organic polymer flocculant polyacrylamide according to the ratio of 1:4 mass ratio compound), after mixing at a speed of 300r / min for 30s; stirring at a speed of 350r / min for 2min; stirring at a medium speed of 100r / min for 10min, stirring at a slow speed of 60r / min for 20min, and reprecipitating for 30min. A further reduction of 57%; the effluent enters the medium nutrient salt online monitoring and replenishment system, online monitoring of all anions and cations in the medium formula, it is measured that iron and ...

Embodiment 3

[0029] Measure 500mL of chlorella aging solution provided by Cibai Enterprises, pump it into the ozone reaction tank, add 5mL of 30% hydrogen peroxide, set the ozone concentration at 6.5mg / L, and react for 30-60 minutes, the content of inhibitor fatty acids decreased 34%, pump the waste liquid into the coagulation sedimentation tank, adjust the pH to 6-6.5, and add 5 mg of composite flocculant (inorganic composite flocculant polymerized ferric magnesium sulfate and organic polymer flocculant polyacrylamide according to the ratio of 1:2 mass ratio compound), after mixing at a speed of 300r / min for 30s; stirring at a speed of 350r / min for 2min; stirring at a medium speed of 100r / min for 10min, stirring at a slow speed of 60r / min for 20min, and reprecipitating for 30min. A further reduction of 18%; the effluent enters the medium nutrient salt online monitoring and replenishment system, and all anions and cations in the medium formula are monitored online. It is measured that iron ...

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Abstract

The invention belongs to the technical field of water treatment, and especially relates to a physicochemical combination process based on recycling treatment of chlorella aging liquid. The method comprises the following steps: A. pumping the chlorella aging liquid into an ozone reaction tank, adding hydrogen peroxide, selectively oxidizing and decomposing the inhibitory components of the aging liquid that affect the normal growth of the chlorella, such as fatty acids, and retaining the remaining nutrient salt ions; B. pumping the aging liquid treated in step A into a coagulation sedimentationtank, adding a self-made novel organic-inorganic composite flocculant, mixing and stirring the materials, removing the precipitate, and removing algae inhibiting organic matters in the aging liquid; and C. introducing the aging liquid treated in step B to a medium nutrient salt online monitoring and supplementing system, performing on-line monitoring on nutrients such as iron and potassium ions which are consumed by the algae in the algae culture liquid, wherein other nutrient salts are negligible due to little change in the culture process, and adding the nutrient salts to the treatment liquid to a concentration level of an original formula to realize the circulating culture of the chlorella by the aging liquid after the treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a physicochemical combination process based on recycling treatment of aged chlorella liquid. Background technique [0002] Chlorella has important economic value and is widely used in food, medical care, health care, chemical raw materials, environmental protection, energy and other fields. Therefore, the chlorella aquaculture industry has developed rapidly in recent years. However, large-scale chlorella cultivation needs to consume a large amount of pure water and nutrients, and the multiple reuse of chlorella culture fluid is a common farming method used by enterprises. Due to the generation and accumulation of a large number of metabolic intermediates such as saturated long-chain fatty acids and other organic substances in the process of continuous reuse of chlorella, and become growth inhibitors of chlorella, the chlorella culture solution ages rapidly and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34
CPCC02F9/00C02F1/66C02F1/56C02F1/5236C02F1/78C02F1/725C02F1/722C02F2101/34
Inventor 余冉何雪朱中强薛梦婷铁国磊刘苏皖叶雷魏昕
Owner SOUTHEAST UNIV
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