Method for improving sludge dehydration
A technology for sludge dehydration and sludge, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., to achieve the effect of increasing sludge filtration speed, reducing water content, and solving difficulties in subsequent treatment and disposal
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Embodiment 1
[0028] Embodiment 1: the source and characteristic parameter of activated sludge
[0029] The sludge samples in this experiment were taken from the sludge digester of Qige Wastewater 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 6.52 ± 0.1; total solid mass (g / L) is 16.02 ± 0.2; volatile suspended solids content is 0.40 ± 0.01g / gDS; sludge specific resistance (×10 13 m / kg) was 2.09 ± 0.08; filtration time was 33.5±0.05 s; capillary water absorption time was 31.1±1.1 s; water content was 75.04±0.38.
Embodiment 2
[0030] Example 2: Effects of different acids on sludge dewatering performance at different pH values
[0031] Take 100 ml of sludge samples with a solid content of 16 g / L, add a certain amount of 0.6M citric acid, 95% glacial acetic acid, 1M hydrochloric acid, and 1M sulfuric acid respectively, and adjust the pH of the sludge treated with each acid to 2.0, 3.0, 4.0, 5.0, 6.0, and then put the sludge sample under magnetic stirring at 150 rpm for 5 min. After conditioning, the sludge samples were vacuum filtered using a Buchner funnel at a pressure of 0.06 MPa for 30 min, and the sludge specific resistance and sludge water content were measured to evaluate the sludge dewatering efficiency. Compared figure 1 , figure 2 , image 3 , Figure 4 , it can be seen from the water content that acid can improve the dewatering performance of sludge; from the perspective of sludge specific resistance, when organic acids are used, the sludge specific resistance increases first and then ...
Embodiment 3
[0032] Example 3: Effect of flocculant first and then acid treatment on sludge dewatering performance
[0033] The experimental group with flocculant added first: take 100 ml of sludge samples with a solid content of 16 g / L and put them in a beaker, add a certain amount of polydimethyldiallylammonium chloride and stir under magnetic stirring at 150 rpm. 2 min, then add 0.6M citric acid, 95% glacial acetic acid, 1M hydrochloric acid, 1M sulfuric acid, adjust the pH of the sludge to 2.7, and stir for 5 min under magnetic stirring at 150 rpm. After conditioning, the sludge sample is used The Buchner funnel was vacuum filtered at a pressure of 0.06 MPa for 30 min, and the sludge specific resistance and sludge water content were measured to evaluate the sludge dewatering efficiency.
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