Method for improving sludge dewatering through cooperation of heat treatment and flocculant
A sludge dehydration and flocculant technology, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems that have not been reported, improve dehydration capacity, and facilitate the treatment and disposal process , the effect of saving energy
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Embodiment 1
[0025] Embodiment 1: the source and characteristic parameter of activated sludge
[0026] The sludge samples in this experiment were taken from the sludge digester of Liangzhu Sewage Treatment Plant in Hangzhou City, Zhejiang Province. After the sludge was taken to the laboratory, it was filtered with a 0.9 mm pore size screen and stored in a refrigerator at 4 °C. The basic parameters of sludge are as follows: pH is 6.81±0.1; total solid mass (g / L) is 13.15±0.007; sludge specific resistance (×10 13 m / kg) was 1.49±0.12; the capillary water absorption time was 23.78±0.80s; the water content was 77.64%±0.31.
Embodiment 2
[0027] Example 2: Effects of different concentrations of polyacrylamide on sludge dewatering performance
[0028] Take 6 parts of 100ml sludge samples with a solid content of 13g / L and place them in a 250mL beaker, heat the sludge to 80-90°C, and then add 0.0, 2.5, 5.0, 7.5, 10.0, 12.5 mg / g DS of polypropylene Amide, stirred at a stirring speed of 150rpm for 2min, then added sulfuric acid to adjust the pH of the sludge sample to 6.0, and stirred at a stirring speed of 150rpm for 28min. After the reaction, the sludge samples were vacuum filtered with a Buchner funnel at a pressure of 0.06 MPa for 30 minutes to measure the water content of the sludge, and the CST of the sludge samples was measured with a CST instrument to comprehensively evaluate the sludge dewatering efficiency. figure 1 is the effect of different concentrations of polyacrylamide on sludge moisture content and CST, from figure 1 It can be seen from the figure that when the concentration of polyacrylamide is 10...
Embodiment 3
[0029] Example 3: Effects of different pH on sludge dewatering
[0030] Take 6 parts of 100ml sludge samples with a solid content of 13g / L and place them in a 250mL beaker, heat the sludge to 80-90°C, then add 10.0mg / g DS polyacrylamide, and stir at a stirring speed of 150 rpm 2min, then add sulfuric acid to adjust the pH of the sludge sample to 2.0, 3.0, 4.0, 5.0, 6.0, 6.8 respectively, and stir for 28min at a stirring speed of 150rpm. Vacuum filtration under pressure for 30 minutes to measure the moisture content of the sludge, and measure the CST of the sludge sample with a CST instrument to comprehensively evaluate the sludge dewatering efficiency. figure 2 It is the water content and CST of sludge at different pH. It can be seen from the figure that the water content decreases when the pH=2.0 and 3.0, but the specific resistance of the sludge increases. When the pH=4.0, 5.0, and 6.0, the water content and CST change little , Compared with the original sludge, it has dro...
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