The use of coal based activated carbon treatment wastewater treatment should pay special attention to the following points.
The oil in the wastewater form four:
The oil for oily wastewater, 80% ~ 90%, large particles, usually more than 100/zm, the easy floating on the water surface;
The particle size of dispersed oil, generally in the 10 ~ 100fim; suspended in the water, notstable, long time still often become the oil slick;
The emulsified oil, oily wastewater of 10% ~ 15%, the particle size of 0.10 ~ 10/xm, not easy to float;
The soluble oil, oily wastewater of 0.2% ~ 0.5%, the particles were smaller than 0 lOpmsoluble in water.
Method for treating oily wastewater coal columnar activated carbon have:
FFI oil tank device adopts the law of gravity, the relative density of oil and water is different, the separation of oil-water gravity in oil separation tank, the oil floating in the pool, to be removed. The commonly used oil separation tank Youping flow (API), a parallel plate, corrugated plate, inclined plate (PPI), in which the advection application widely. Oil separation tank has the advantages of simple structure, convenient operation, strong adaptability, can separate the oil particles in 60/xm above
(2) flotation gas float through the air in the oily waste water, forming small bubble, the oil dropattached to the tiny bubbles, accelerate oil droplets floating, to separate gas float oil to addcollaborative treatment coagulant. Recent progress of float oil removal technology has many improvements
(3) the membrane separation method such as the use of ultrafiltration membrane technology,the oil-water thin.
(4) the biochemical treatment especially for melted oil wastewater, difficult to remove bysimple physical method or chemical method, using biochemical treatment method
(5) the adsorption method is the use of large specific surface area of the dear oil hydrophobic porous absorption material, adsorption of oil from the surface of the water, then try to recoveroil from the adsorbent. The suction trap agent can be repeatedly used again. The key of this method is to select the suitable adsorbents. According to the properties of the adsorbent, can be divided into carbonaceous adsorbent (such as activated carbon, coal, slag, peat etc.),inorganic adsorbents (such as zeolite, diatomite, bentonite, perlite, two gasification silicon),organic adsorbent (natural fibers, sawdust, wood chips,
(6) the combination treatment methods combined, such as oil, gas, and biochemicalprocesses such as serial processing, better.
Treatment of phenol wastewater by coal columnar activated carbon, adsorption and microbialdegradation by activated carbon.
Removal of organic matter can be summarized as the adsorption and biodegradation of two kinds of function in coal columnar activated carbon technology, organic matter removal pathways depends on the adsorption and biodegradation. According to the adsorption and biodegradation of organic compounds, phenol, adsorption, which belongs to thebiodegradable organic matter, available through the enhanced biological activity, improvesensitive biological activity, adsorption load can reduce carbon column, prolong the service life of carbon column. Coal columnar activated carbon adsorption and biological degradation of phenol to play by active carbon synergistic effect, stable and efficiently remove phenol.Phenol was the strong adsorption of activated carbon adsorption in the pores of the sameadsorption biodegradation, eventually, gathered on the surface of activated carbon and the big hole for substance C02. Digiant and speitel using phenol C tagged test, C markers to the existence of C02 found in the effluent. The pre adsorption of phenol, biodegradation of the carbon surface.
The process of coal columnar activated carbon treatment of phenol, relates to the activated carbon, microorganism, water benzene B8 and dissolved gas West factors in the interactionof water.
Coal based activated carbon filter design in some key process parameters need specialattention
The coal based activated carbon filtration speed: it is an important index of water quality andoperation management, and the water flow (i.e. the scale of production) and filter area,therefore in the normal operation can not adjust the rate of filtration, the design must firstconsider the filter rate reasonable. In the carbon layer thickness under the condition offiltration speed slower, the longer the exposure, the contact time of coal based activated carbon adsorption effect better, the effluent quality is better, Fujian activated carbon factoryfiltration speed is generally 7.5 ~ 15m/h.
The coal based activated carbon layer thickness: the thickness of carbon layer to SV valueas criterion, a value of SV indicates the treatment capacity in unit time, the unit volume of coal based activated carbon SV=Q/Cv, Q per hour processing capacity (m3/h), Cv is the volume of coal based activated carbon (M3), the SV value was 4 ～ 8 can keep better treatment effect.The thickness of carbon layer of Fujian activated carbon factory filter is generally 1.8 ~ 3.6m.
The drainage groove distance of the carbon level: the spacing is too easily lead to antiwashing coal activated carbon particle erosion, spacing is too large, is not conducive to thebackwashing wastewater discharged in time, will be more consumption of backwashing water.According to the Fujian water field, air cushion layer when washing the filter plate andoccupies a volume of gas in water, water level rises about 45cm, the new coal activated carbon after being put into use for a period of time, by the number of backwashing carbon layer is fluffy, coal activated carbon layer thickness is just inputs increase about about 15cm,consider again later to add new coal activated carbon increased carbon layer height, the design should be appropriate to leave adequate leeway. |
