Activated carbon filter analysis of printing and dyeing wastewater treatment technology
said. 5 g of carbon under different carbonization temperature in the middle of 100 ml grinding tapered bottle mouth, add 100 ml of printing and dyeing wastewater, the oscillator in 120 r/min, the oscillation under 25 ℃ for 30 min, filtering, measuring the absorbance values. Increased carbonization temperature from 400 ℃ to 800 ℃, decoloring rate increases gradually, its reason is in the process of carbonization, peanut shells in the decomposition of cellulose and lignin, produce the reaction, such as dehydration, acid and aromatic nucleus, the combination between the subsequent dehydrogenation, a large number of aromatic nucleus direct combination, form a two-dimensional planar structure, at the same time combining - CH2- , forming a three-dimensional structure, forming a developed pore, make the peanut shells after carbonization, carbon adsorption. Carbonization temperatures continue to rise to 900 ℃, its decolorization rate have decreased, the reason is that the temperature is too high, make cellulose carbonization nodules in peanut shells, hindered the formation of porosity. So the carbonization temperature 800 ℃.
carbonized time increased from 30 min to 150 min, the products of printing and dyeing wastewater decolorizing rate increase gradually, when more than 150 min, decoloring rate decreases with the increase of carbonization time, decoloring rate reached the maximum at 150 min, at this time, most of the carbon element in the peanut shells and carbohydrates have removed, has formed a certain number of microporous structure. So the coking time to choose 150 min.
from peanut shell after the carbonized carbon decoloring rate as you can see, without any processing of peanut shell carbon decoloring rate is low, the reason is that the peanut shell carbon has not yet formed developed pore structure, part of the pores clogging. In order to improve the peanut shell carbon adsorption ability, it is necessary for activation treatment. Activator ( H2SO4) The dilution ratio, activation temperature and activation time, solid-liquid ratio are the main factors influencing the peanut shell carbon activation. In this paper, using orthogonal experiments L9 ( 34) To optimize conditions. The four factors influencing the peanut shell activated carbon adsorption capacity in comparison to: primary and secondary activator dilution ratio & gt; Activation time & gt; Temperature & gt; Solid-liquid ratio. As can be seen from the results, the best conditions for: A3B2C1D2.
in 100 ml of printing and dyeing wastewater, adding activated carbon 0. 2 g, the oscillator in 120 r/min, the oscillation under 25 ℃ for 30 min, the influence of pH value rate of decolorization of printing and dyeing wastewater. PH value in 1 ~ 5, printing and dyeing wastewater decolorizing rate changed little, from handling cost consideration, choose its own printing and dyeing wastewater pH is reasonable, therefore, choose a pH value of 5. In 100 ml of printing and dyeing wastewater, adding activated carbon 0. 2 g, regulate the pH value of 5, the temperature is 25 ℃, 30 min at different rates on the oscillator oscillation, oscillation speed rate of decolorization of printing and dyeing wastewater. The oscillation rate increases, the decolorization rate increase gradually, to reach maximum 160 r/min, after gradually reduce, because the oscillation rate is too large, non-ferrous material will parse out, therefore, choose the oscillation speed of 160 r/min.
the dosage of activated carbon. Take 6 copy of printing and dyeing wastewater, each 100 ml each, adding different amount of peanut shell activated carbon, adjust pH value of 5, the temperature is 25 ℃, the oscillator to 160 r/min oscillation adsorption 120 min, the influence of the dosage of activated carbon for waste water decoloring rate as shown in figure 6. The dosage of the peanut shell activated carbon has a great influence on the decolorization rate of printing and dyeing wastewater. With the increase of dosage of peanut shell activated carbon, decoloring rate also increased, but the amount of more than 1. After 5 g, the impact on the decolorization rate has not obvious, that when the dosage of the peanut shell activated carbon to 1. 5 g, the adsorption of basic saturated state, namely the peanut shell activated carbon dosage of 15 g/L ( 1. 5g/100mL) Is good, at this time of printing and dyeing wastewater decolorization rate was 96. 7%.
using sulfuric acid activated optimum process conditions of preparation of peanut shell activated carbon: carbonization temperature is 800 ℃, the coking time of 150 min and sulfuric acid as activator of dilution ratio is 1:1, the solid-liquid ratio of 1:2, activation time of 90 min, activation temperature was 60 ℃, under the condition of the preparation of activated carbon adsorption of printing and dyeing wastewater treatment effect is good. Peanut shell activated carbon adsorption process optimum technological conditions of printing and dyeing wastewater, adsorbent dose of 15 g/L, adsorption time of 120 min, oscillation speed of 160 r/min, wastewater pH value of 5, the temperature is 25 ℃, printing and dyeing wastewater decolorization rate was 96. 7%. Preparation of activated carbon with solid waste peanut shell, has realized the recycling use of peanut shells, open up new way for the preparation of activated carbon source of raw materials, to achieve 'using waste treat waste, recycling economy.