Method for purification of alkaline heavy metal wastewater by chlorella

A chlorella and heavy metal technology, applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., can solve the problems of water pollution and difficult treatment, and achieve the effect of efficient adsorption and good growth state.

Active Publication Date: 2014-11-05
浙江优创材料科技股份有限公司
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the water pollution phenomenon caused by frequent discharge of alkaline heavy metal wastewater in small batches in the production process, which is difficult to deal with and cannot be applied to large-scale treatment methods, the present invention provides a convenient and flexible treatment method for using chlorella to purify alkali A method for non-toxic heavy metal wastewater, which can effectively adsorb Fe in wastewater by adding a certain amount of seed culture medium in laboratory wastewater 2+ , and adjust the wastewater pH to close to neutral

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method of utilizing chlorella to purify laboratory waste water of the present invention is carried out according to the following steps successively:

[0023] (1) Fe 2+ The waste water and the high pH waste water are mixed into 1L solution according to the volume ratio of 1:15, and the measured Fe 3+ The concentration is 4.1mg / L, pH=10.5. Add 1ml of seed solution, add 70ml of logarithmic phase Chlorella at a ratio of 7%, initial OD 440nm The value is 0.25, the temperature condition is 28°C, the light condition is 3000Lux, the light cycle is 12 hours of continuous light and 12 hours of continuous darkness every day, and the culture method is static culture for 5 days. The logarithmic phase of Chlorella growth was reached after 5 days.

[0024] (2) Collect the algae by suction filtration, wash and re-cultivate the algae until the OD 440nm When the value reaches 0.8-1.2, it can continue to be used for wastewater purification. The filtrate is the treated wastewater, ...

Embodiment 2

[0026] (1) Fe 2+ The waste water and the high pH waste water are mixed into 1L solution according to the volume ratio of 1:22, and the measured Fe 3+ The concentration is 3.6mg / L, pH=9.7. Add 1ml of seed solution, add 70ml of logarithmic phase Chlorella at a ratio of 7%, initial OD 440nm The value is 0.24, the temperature condition is 26°C, the light condition is 2500Lux, the light cycle is 12 hours of continuous light and 12 hours of continuous darkness every day, and the culture method is static culture for 5 days. The logarithmic phase of Chlorella growth was reached after 5 days.

[0027] (2) Collect the algae by suction filtration, wash and re-cultivate the algae until the OD 440nm When the value reaches 0.8-1.2, it can continue to be used for wastewater purification. The filtrate is the treated wastewater, and the Fe 3+ The content is 2.0mg / L, pH=7.7, OD 440nm When the value is 0.52, the growth state of Chlorella is good.

Embodiment 3

[0029] (1) Fe 2+ The waste water and the high pH waste water are mixed into 1L solution according to the volume ratio of 1:8, and the measured Fe 3+ The concentration is 5.2mg / L, pH=8.5. Add 1ml of seed solution, add 60ml of logarithmic phase Chlorella at a ratio of 6%, initial OD 440nm The value is 0.21, the temperature condition is 25°C, the light condition is 3000Lux, the light cycle is 12 hours of continuous light and 12 hours of continuous darkness every day, and the culture method is static culture for 5 days. The logarithmic phase of Chlorella growth was reached after 5 days.

[0030] (2) Collect the algae by suction filtration, wash and re-cultivate the algae until the OD 440nm When the value reaches 0.8-1.2, it can continue to be used for wastewater purification. The filtrate is the treated wastewater, and the Fe 3+ The content is 2.4mg / L, pH=7.1, OD 440nm When the value is 0.46, the growth state of Chlorella is good.

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Abstract

Belonging to the technical field of small batch industrial wastewater treatment, the invention relates to a method for purification of alkaline heavy metal wastewater by chlorella. The method includes: collecting wastewater with an Fe<2+> content of 10-80mg/L and pH of 10-13, conducting mixing, then adding a seed solution chlorella into the mixture, controlling the culture temperature and lighting conditions, performing culture through alternation of continuous lighting and continuous darkness till the logarithmic phase of chlorella growth, recycling the chlorella, and discharging the wastewater directly. The purification method provided by the invention can be applied to treatment of alkaline heavy metal wastewater with small single emission, high emission frequency and collection difficulty, and has the advantages of flexible treatment mode and convenient operation, etc.

Description

technical field [0001] The invention relates to a method for purifying alkaline heavy metal wastewater by using chlorella, belonging to the technical field of small-batch industrial wastewater treatment. Background technique [0002] In recent years, due to serious environmental pollution, a large amount of wastewater produced by factories in the production process can be treated on a large scale according to needs. It is usually discharged directly without treatment, causing water pollution; there are many types of laboratory wastewater, including heavy metal pollution. Excessive heavy metals not only cannot promote the growth of organisms, some even poison organisms, which is very harmful; The specific standard solution used, such as Fe 2+ Standard solution, Fe 2+ The concentration is high, if it is directly discharged without treatment, it will cause Fe in local water bodies 2+ Excessive, pollute water bodies. [0003] At the same time, pH is an important indicator of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/20
Inventor 杜宇吴元飞
Owner 浙江优创材料科技股份有限公司
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