A clean production method for reusing residual activated sludge in a sewage treatment plant
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A sewage treatment plant and residual activity technology, applied in the field of sludge sewage treatment and resource utilization, to achieve significant economic benefits, reduction of discharge volume, and reduction of VSS
Inactive Publication Date: 2017-05-03
GUANGDONG UNIV OF PETROCHEMICAL TECH
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[0006] Aiming at the current problem of reutilization of excess activated sludge in sewage treatment plants, the present invention provides a clean production method for reutilization of nitrogen and phosphorus resources and energy utilization of excess activated sludge in sewage treatment plants
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Embodiment 1
[0023]The remaining activated sludge in the secondary sedimentation tank of the urban sewage treatment plant is naturally settled and directly added to the aeration mixing tank without any pretreatment. The sludge sedimentation ratio is 55%. The stirring device controls the stirring rate to 300rpm, and the stirring mode is pulse-intermittent, that is, 10 seconds per revolution and 5 seconds off. Sampling and analysis were taken when the treatment time was 12h, 24h, 48h, 72h, 90h, 110h, 120h, and 130h, and the concentration of soluble phosphorus and nitrogen in the supernatant was measured, and the maximum was reached at the treatment time of 120h, respectively 154.3mg / L And 116.4mg / L, SCOD is 3806.7mg / L.
[0024] After the mixed solution is precipitated, the effluent is discharged into the MAP precipitation reactor, and 5% Na 3 PO 4 solution and 17%MgCl 2 Solution, make the P / Mg / N molar ratio 1 / 1.2 / 1, adjust the pH value of the reaction solution to 8.9 with 5M NaOH, stir wh...
Embodiment 2
[0030] The remaining activated sludge in the secondary sedimentation tank of the urban sewage treatment plant is naturally settled and directly added to the aeration mixing tank without any pretreatment. The sludge sedimentation ratio is 60%. The stirring device controls the stirring rate to 300rpm, and the stirring mode is pulse-intermittent, that is, 10 seconds per revolution and 5 seconds off. When the treatment time was 12h, 24h, 48h, 72h, 90h, 110h, 120h, and 130h, samples were taken for analysis, and the concentration of soluble phosphorus and nitrogen in the supernatant was measured, which reached the maximum when the treatment time was 120h, respectively 137.3mg / L and 120.5mg / L, SCOD is 3990.3mg / L.
[0031] After the mixed solution is precipitated, the effluent is discharged into the MAP precipitation reactor, and 5% Na 3 PO 4 solution and 17%MgCl 2 Solution, make the P / Mg / N molar ratio 1 / 1.2 / 1, adjust the pH value of the reaction solution to 8.95 with 5M NaOH, sti...
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Abstract
Disclosed is a sanitary production method for recycling residual activated sludge in a sewage treatment plant. The method comprises the steps that residual activated sludge in a secondary sedimentation tank of the urban sewage treatment plant is naturally sedimented to reach the sludge sedimentation ratio of 50-60% and then directly added into an aeration stirring tank through no pretreatment, aeration stirring treatment is performed for 110-120 h, and then natural sedimentation is performed; 2, a supernate obtained through natural sedimentation is drained into an MAP sedimentation reactor, the P / Mg / N molar ratio is adjusted to be 1 / 1.2 / 1 by adding a magnesium salt solution and a phosphor salt solution, the pH value of a reaction solution is adjusted to be 8.9+ / -0.1 through 5M NaOH, a supernate obtained after sedimentation is drained into an anaerobic adjusting tank, and generated sediments are discharged into a separation recycling device; 3, sedimentation bottom mud obtained after natural sedimentation in the step 1 is discharged into the anaerobic adjusting tank, a supernate obtained after MAP sedimentation in the step 2 is drained into the anaerobic adjusting tank, and then further fermentation is performed to produce methane and recycle energy. Operation is convenient and easy to implement, no new chemical substances are introduced, follow-up slurry anaerobic digestion treatment is facilitated, and the recycling cost of phosphorus resources and energy is low.
Description
technical field [0001] The invention relates to a clean production method for reusing excess activated sludge in a sewage treatment plant, which realizes the recycling target of excess activated sludge in a sewage treatment plant, belongs to the technical field of sludge sewage treatment and resource utilization, and is a new technology for clean production . Background technique [0002] The annual dry sludge output of my country's urban sewage treatment plants is about 300,000 tons, and it grows at a rate of about 10% every year, and its treatment and disposal costs account for 25% to 40% of the total operating costs of sewage treatment plants. However, the level of residual sludge treatment in my country is much behind the level of sewage treatment technology. Domestic sewage treatment plants with stable sludge treatment facilities are less than 1 / 4. The treatment and disposal of urban sewage plant sludge has become an urgent problem in the process of my country's moderni...
Claims
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