Biological drying method of municipal dewatered sludge without auxiliary materials based on sodium hydroxide pretreatment
A technology of biological drying and sodium hydroxide, which is applied in biological sludge treatment, dewatering/drying/concentrating sludge treatment, etc., can solve the difficulty of sludge filling recovery, the rapid growth of unfavorable microorganisms, and the reduction of sludge pH value. and other problems, to achieve the effect of high-efficiency biological drying and reduction, conducive to rapid growth and reproduction, and reducing the content of pollutants
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Embodiment 1
[0038] The method of biological drying of municipal dewatered sludge based on sodium hydroxide pretreatment without auxiliary materials consists of the following steps: (1) The initial water content of municipal dewatered sludge is 80%, take 50 kg of sludge, add 100 grams of sodium hydroxide, After 2 days of treatment at 40°C, the soluble protein content in the sludge increased from 508 μg / g dry weight to 2380 μg / g dry weight, and the pH value after the treatment was 8.4, and an alkaline sludge matrix was obtained.
[0039] (2) Preparation of sludge biological drying matrix: Dry a part of the alkaline sludge matrix obtained in step (1) to a water content of 5%, and obtain the dried sludge with step (1) to obtain the alkaline sludge matrix Mix and adjust the initial water content to 50% to obtain the sludge biological drying matrix.
[0040] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 20°C ( T...
Embodiment 2
[0043] The method of biological drying of municipal dewatered sludge without auxiliary materials based on sodium hydroxide pretreatment consists of the following steps: (1) The initial water content of municipal dewatered sludge is 76%. Take 60 kg of sludge and 600 grams of sodium hydroxide in After treatment at 20°C for 4 days, the soluble protein content in the sludge increased from 580 μg / g dry weight to 13530 μg / g dry weight. After the treatment, the pH value of the sludge was 9.7, and an alkaline sludge matrix was obtained.
[0044] (2) Deployment of sludge biological drying matrix: dry a part of the alkaline sludge matrix through step (1) until the water content is 10%, add it to the alkaline sludge matrix obtained in step (1), and adjust the initial The water content is 65%, and the sludge biological drying matrix is obtained.
[0045] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 40°C ...
Embodiment 3
[0048] The municipal dewatered sludge biological drying method without auxiliary materials based on sodium hydroxide pretreatment consists of the following steps:
[0049] (1) The initial water content of municipal dewatered sludge is 70%. Take 40kg of sludge, add 320g of sodium hydroxide, and treat it at 30°C for 3 days. The content of soluble protein in the sludge increases from 480μg / g dry weight To 14580 μg / g dry weight, the pH value of the sludge after the treatment was 9.1, and the alkaline sludge matrix was obtained.
[0050] (2) Preparation of sludge biological drying matrix: Add the biologically dried dry sludge with a water content of 39% obtained in Example (2) to the alkaline sludge matrix obtained in step (1) to adjust the initial The water content is 60%, and the sludge biological drying matrix is obtained.
[0051] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 30°C ( Trichode...
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