Analysis of activated carbon test results? (Continued, results available)
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The wastewater from the fine chemical industry does not meet the discharge standards; the parameters of this wastewater are as follows. Daily flow: 400–700 cubic meters ； COD: 2000 ； BOD: 200 ； TDS: 4000. Contains the following organic compounds: propanol, propylidene, butylidene. Among them, Ding Tong is the main part. Phenomenon 1: For 1 liter of wastewater sample, which had a certain degree of turbidity, different amounts of activated carbon (1 gram, 4 grams, 7 grams) were added, after which it was filtered using filter paper to obtain a colorless solution; the odor also **decreased** ； Waiting for chemical analysis. Phenomenon 2: The sample has a certain degree of turbidity; after filtration through filter paper, a clear yellow solution is obtained ； But the filtering speed is relatively slow. Discussion 1: In industrial practice, activated carbon cannot be used directly for adsorption; a filtration and clarification process is required first. What process in industry can achieve this goal? Microfiltration? Still a clarification tank? Discussion 2: Direct filtration of wastewater is relatively slow; is this due to viscosity or to the impurities present in the wastewater? Thank you for your valuable advice. Continued: The chemical analysis report shows that for 4 grams of activated carbon, the butane content decreased from 46 ppm to 16 ppm ； For 7 grams of activated carbon, the butane content decreased from 46 ppm to 12 ppm ； However, the propylene content in the samples all decreased from 21 ppm to around 10 ppm. Due to pollution, the concentration of propanol has risen from 1 ppm to around 15 ppm. The results show that activated carbon is still effective. However, the emission standards are too high, making it difficult for us to achieve zero emissions. We are now considering three methods to improve the experimental results: 1) to filter first before adding activated carbon for adsorption ； 2 is an increase in the amount of activated carbon used to 20 grams and 30 grams. 3. Prepare to search for adsorbents as alternatives to activated carbon. Excuse me, are the above three measures effective? Your valuable feedback is welcome. Thank you. This post was last edited by nanyangguest on 2008-3-17 19:43]
The filtration is slow; there must be too many impurities, and this also affects the viscosity. Try pressure filtration to increase the filtering intensity. It is also recommended that you separate the organic matter in the wastewater so that it can be reused if possible. And I think building a sedimentation tank is a great solution.
Try coagulation sedimentation to remove impurities, and then filter. The slow filtration speed, in my opinion, is caused by both of the aforementioned reasons; it is likely that an excessive amount of impurities is the main issue, with those impurity particles being quite fine and thus blocking the pores in the filter paper.
Thank you. Your suggestions are very valuable.
:) :victory: :loveliness:
Blockages in water bodies are usually due to excessive viscosity of mucus when the duration is short, while an excessive amount of impurities is the common cause when the filtration time is within the normal range. Excessively high viscosity generally manifests as sudden blockages in a short period of time. It is recommended to carry out neutralization first, then add some coagulants and high-molecular substances; after another precipitation step, the water quality will be excellent. This project is okay; it doesn’t require much money and doesn’t take up a lot of space. As long as your factory still has 30 square meters, that will be sufficient.
I think it’s easier to use the same type of temperature-dependent adsorption method under gas-phase conditions, and it’s possible to achieve adsorption levels of less than 1 ppm; liquid phase methods are not as straightforward. Feel free to discuss at cuihuaji2@163.com
Hello, this is closely related to the previous processing steps involved in preparing the activated carbon, as well as the type of activated carbon and its adsorption properties. The use of activated carbon to remove the aforementioned pollutants should yield relatively good results. The reasons for slow adsorption include: 1) the previous processing steps may not have involved precipitation or filtration; 2) … Granular activated carbon or powdered activated carbon, fluidized bed or fixed bed?
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Coagulation itself also has an adsorption effect on COD; changing the process to coagulation-precipitation-filtering-adsorption will yield much better results
Since the main pollutants are propanol, propyl group, and butyl group, why is the B/C ratio only 0.1? This type of wastewater should be able to be treated using biological methods, with activated carbon used for adsorption after the biochemical treatment, resulting in very satisfactory treatment outcomes.