Activated carbon treatment method
In the application of granular activated carbon bed, wastewater must be pretreated to remove oil and reduce suspended solids, so that the suspended solids content is less than 50 mg/L, so as to avoid blocking the carbon layer, increasing head loss and frequent backwashing.
Powder activated carbon treatment is also called bio-physical treatment, adding aeration and adding powder carbon aeration. It puts powdered activated carbon into an aeration tank,
This not only makes full use of wastewater treatment equipment, but also improves the treatment effect. The removal of pollutants by this method is generally considered to be the synergistic effect of adsorption and microbial oxidative decomposition. A large number of micropores of activated carbon adsorb oxygen in organic matter and wastewater, which provides a high concentration of nutrients for the growth and reproduction of microbial communities. Enzymes and coenzymes produced in the process of microbial metabolism are adsorbed and enriched in the micropores of activated carbon, and the contact time between microorganisms and organic substances on carbon is long, which makes it possible for refractory organic substances to be decomposed through biological oxidation. Powder activated carbon treatment generally includes three steps:
(1) Stir vigorously, so that carbon can be quickly dispersed into sewage;
(2) contact adsorption oxidation, so that carbon is suspended in sewage for suspension adsorption oxidation;
③ Liquid-solid separation, that is, carbon is separated from sewage and then regenerated.
The advantage of this method are:
① The therapeutic effect is good and stable;
② The resistance of microorganisms to organic poisons and heavy metals is improved;
(3) producing agglomerated carbon bodies and microorganisms to form solid and dense sludge, which improves the operating conditions of activated sludge process;
④ Activated carbon can adsorb surface active substances, which solves the problem of foaming in aeration tank;
⑤ It can be used to treat wastewater with complex composition, changeable concentration and water quantity;
⑥ Low cost of toner. However, due to the difficulty of toner regeneration, it has not been applied to practice so far. 1972 fluidized bed regenerator successfully regenerated powdered activated carbon, which provided conditions for the application of powdered activated carbon.
The latest technology of treating wastewater with powdered activated carbon is a single-stage contact system, that is, mixing, contact reaction and gravity precipitation are completed in the same equipment, and the residence time of carbon in the equipment is 2 ~ 5 days. This is beneficial to the activity of microorganisms and improves the treatment effect.
Adding a certain amount of powdered activated carbon into the sludge digestion tank,
It can accelerate sludge sedimentation, purify the supernatant returned to the water treatment system and improve the efficiency of the water treatment system. In addition, it can promote the decomposition of sludge solids, eliminate odor and improve the production capacity of equipment. Advantages of activated carbon
The main advantages of activated carbon in advanced sewage treatment are high treatment degree and stable effluent quality. BOD () and COD()SS (suspended matter) in the treated water are usually lower than 10, 15 and 5mg respectively.
If supplemented by other treatment measures, it can meet the drinking water standard, but the investment and treatment costs are high. Activated carbon also has strong adsorption capacity for some heavy metal compounds, such as mercury, nickel, chromium, lead, iron, zinc and cobalt. Therefore, activated carbon is also effective in treating electroplating wastewater and smelting wastewater.
1. Activated carbon also has strong adsorption capacity for some heavy metal compounds, such as mercury, lead, iron, nickel, chromium, zinc and cobalt. Therefore, activated carbon is also effective in treating electroplating wastewater and smelting wastewater.
2. Activated carbon has strong adaptability to the changes of water quality, water temperature and water quantity. Activated carbon has a good removal effect on sewage with high concentration or low concentration of the same organic pollutant.
3. Saturated carbon can be reused after regeneration without secondary pollution.
4. Useful substances can be recycled, such as treating high-concentration phenol-containing wastewater, and sodium phenolate can be recycled after being regenerated with alkali.
5. Moreover, it has a good removal effect on organic pollutants such as chromaticity, odor, methylene blue surfactant, herbicides, pesticides, synthetic detergents, synthetic dyes, amine compounds, and various synthetic organic compounds that are difficult to remove by biological methods and future chemical methods.
Summary: Here, we will introduce the methods of sewage treatment with activated carbon and the relevant information about the advantages of activated carbon. I hope this article is helpful to everyone. If you still don't understand, please leave me a message below and we will answer you as soon as possible.
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