Solar-power-based sludge low-shrinkage energy-saving drying method
A solar energy, low shrinkage technology, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve problems such as unfavorable heat treatment, and achieve sludge reduction and acceleration. The effect of drying and dehydration and improving the drying rate
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Embodiment 1
[0044] Ammonium carbonate, magnesium oxide, kelp powder, and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, the mass ratio of which is 40%: 20%: 30%: 10%, and mixed with sludge. The amount added is 5% of the dry basis of the sludge, of which the moisture content of the sludge is 80%, mixed evenly, pumped in with a high-pressure pump, uniformly distributed in the solar interlayer drying system, and dried under normal sunlight conditions. The temperature fluctuates between 38-80°C during the day, and the time required for the moisture content to decrease from 80% to 20% is 2 days (the actual effective time is 18 hours), while the simple solar drying without adding puffing conditioner needs 3.5 hours to achieve the same requirement. d (The actual exposure time of sunlight is 32h). Compared with adding puffing conditioner and without adding puffing conditioner, the sludge density is from 1.0465g / cm 3 Raised to 1.7134g / cm 3 , The volume ha...
Embodiment 2
[0046] Ammonium bicarbonate, magnesium chloride, seaweed powder and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, and its mass ratio is 60%: 10%: 25%: 5%, and mixed with sludge, wherein the water content of sludge 88%, the dosage of the puffing conditioner is 10% of the dry basis of the sludge, mixed evenly, after 15 minutes, the capillary water absorption time of the sludge increased from 3700s of the original sludge to 4206s, and it was pumped in with a high-pressure pump. In the solar interlayer drying system, the fabric is evenly distributed and dried under normal sunlight conditions. The temperature in the interlayer fluctuates between 38-80°C during the day, and the time required for the moisture content to decrease from 88% to 20% is 2 days (the actual effective time is in 24h), and pure solar drying without adding puffing conditioner, it takes 4d to meet the same requirements (the actual exposure time of sunlight is 36h). As a ...
Embodiment 3
[0048] Ammonium carbonate, calcium oxide, blue-green algae powder and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, the mass ratio of which is 50%: 15%: 27%: 8%, and mixed with sludge, the throwing of the puffing conditioner The amount added is 15% of the dry basis of the sludge, and the moisture content of the sludge is 92%. Mix evenly. After 15 minutes, the capillary water absorption time of the sludge increases from 3700s of the original sludge to 4206s. Evenly distribute the fabric in the interlayer solar drying system, and dry it under normal sunlight conditions. The temperature in the interlayer fluctuates between 38-80°C during the day, and the time required for the moisture content to decrease from 92% to 20% is 2 days (the actual effective time is in 24h), and pure solar drying without adding puffing conditioner, it takes 4d to meet the same requirements (the actual exposure time of sunlight is 44h). The volume of sludge has s...
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