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A biological treatment method for reverse osmosis concentrated brine
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A technology of biological treatment and concentrated brine, applied in the direction of biological water/sewage treatment, methods using microorganisms, biochemical equipment and methods, etc., can solve the problem of high cost of COD removal, achieve low cost and reduce COD
Active Publication Date: 2018-11-16
POTEN ENVIRONMENT GRP +1
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Problems solved by technology
[0005] The embodiment of the invention discloses a biological treatment method of reverse osmosis concentrated brine, which is used to solve the problem of high COD removal cost in concentrated brine
Method used
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Examples
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Effect test
Embodiment 1
[0093] Initial index of reverse osmosis concentrated brine: COD Cr The concentration is 416.8mg / L, the salt content is 2.67%, and the ammonianitrogen concentration is 8.9mg / L.
[0094] Take 10L reverse osmosis concentrated brine, measure its pH value, the pH value is 7.8, add 400g of immobilized highly salt-tolerant COD degrading bacteria, and at the same time pass in air for continuous aeration, the air flow rate is 30L / min, and treat for 10h; then Add 5mL of composite synergistic components to the concentrated reverse osmosis brine, continue to pass in air for continuous aeration, the air flow rate is 30L / min, continue aeration treatment for 40h, and then collect the effluent.
[0095] Water output index: COD Cr The concentration is 25.8mg / L.
Embodiment 2
[0097] Initial index of reverse osmosis concentrated brine: COD Cr The concentration is 416.8mg / L, the salt content is 2.67%, and the ammonia nitrogen concentration is 8.9mg / L.
[0098] Take 10L reverse osmosis concentrated brine, measure its pH value, the pH value is 12, adjust the pH value to 5 with sulfuric acid, add 300g of immobilized highly salt-tolerant COD degrading bacteria, and at the same time pass in air for continuous aeration, the air flow rate is 30L / min, treatment for 15h; then add 10mL composite synergistic components to the reverse osmosis concentrated brine, continue to introduce air for continuous aeration, the air flow rate is 30L / min, continue aeration treatment for 60h, and then collect the effluent.
[0099] Water output index: COD Cr The concentration is 28.9mg / L.
Embodiment 3
[0101] Initial index of reverse osmosis concentrated brine: COD Cr The concentration is 416.8mg / L, the salt content is 2.67%, and the ammonia nitrogen concentration is 8.9mg / L.
[0102] Take 10L of reverse osmosis concentrated brine, measure its pH value, the pH value is 8.9, add 200g of immobilized highly salt-tolerant COD degrading bacteria, and add 8mL of compound synergistic components at the same time, pass in air for continuous aeration, the air flow rate is 30L / min, and collect the effluent after 20 hours of aeration treatment.
[0103] Water output index: COD Cr The concentration is 27.2mg / L.
[0104] It can be seen from the above examples that the biological treatment method of a kind of reverse osmosis concentrated brine provided by the present invention adopts immobilized highly salt-tolerant COD degrading bacteria and adds composite synergistic components to carry out enhanced biological treatment of reverse osmosis concentrated brine. COD-degrading bacteria ca...
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Abstract
An embodiment of the invention disclosed a biological treatment method for reverse osmosis strong brine. The salt content of the reverse osmosis strong brine is 1 percent to 6 percent, the CODCr concentration is 100 to 1000mg / L, the ammonia concentration is 1 to 10mg / L, and the ratio of B / L is lower than 0.2. The biological treatment method comprises the steps of measuring the pH value of the reverse osmosis strong brine, under the condition that the pH value of the reverse osmosis strong brine is 5 to 11, adding immobilized high salt tolerant COD degrading bacteria, performing continuous aeration at the same time, processing for 5 to 20h, then adding a composite synergistic component, performing aeration treatment continuously for 20 to 60h, and then collecting effluent; or adding the composite synergistic component while adding the immobilized high salt tolerant COD degrading bacteria, performing aeration treatment continuously, processing for 5 to 80h, and then collecting effluent. A method provided by the invention belongs to a biological method, and is low in cost relative to an advanced oxidation process.
Description
technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a biological treatment method for reverse osmosis concentrated brine. Background technique [0002] Reverse osmosis technology uses the characteristics of selective permeability of reverse osmosis membrane to filter and concentrate surface water or advanced treated sewage, filter out salt, organic matter and other particulate impurities in water, and realize water purification or reclaimed water reuse. Purpose. In the process of reverse osmosis treatment, a large amount of concentrated brine will be produced, the salt content of these concentrated brines is as high as 1% to 6%, and the COD Cr (Using potassium dichromate (K 2 Cr 2 o 7 ) as an oxidant, the chemical oxygen demand (Chemical Oxygen Demand, COD)) is 100-1000mg / L, the content of ammonianitrogen is extremely low, and the biodegradability (Biochemical Oxygen Demand / Chemical OxygenDemand, B / C) is poor. ...
Claims
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