Method for improving recovery efficiency of phosphorus in sludge and promoting anaerobic digestion

An anaerobic digestion and phosphorus recovery technology, applied in chemical instruments and methods, phosphorus compounds, sludge treatment, etc., can solve the problems of low release, difficult release, adverse effects of equipment, etc., to improve recovery efficiency, improve purity, Conducive to the effect of transportation and post-processing

Inactive Publication Date: 2020-02-28
XIAN UNIV OF TECH
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Problems solved by technology

[0003] Under normal storage conditions, the release rate and amount of phosphorus from sludge are low. At present, the release of phosphorus from sludge mainly uses physical and chemical means such as thermal hydrolysis, acid-base dosing, anaerobic digestion, and oxidation. The release rate of phosphorus is relatively low. It is difficult to effectively release; secondly, using the digested supernatant produced for struvite (MgNH 4 PO 4 ) recovery will have the problem of invalid fouling of the transmission pipeline, which will have an adverse effect on the equipment

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  • Method for improving recovery efficiency of phosphorus in sludge and promoting anaerobic digestion

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[0043] (1) Take the remaining sludge from the secondary sedimentation tank of the urban sewage treatment plant, centrifuge it through a centrifuge at 1500r / min, and centrifuge it at room temperature for 5 minutes, so that its moisture content will be about 95% (residual sludge characteristics: TP: 520~734.1mg / L, IP: 416.1~458.1mg / L, TCOD: 44707~45180mg / L).

[0044] (2) if figure 1 As shown, the excess sludge with a moisture content of 95% obtained from pretreatment is added to the low-temperature thermal hydrolysis reactor, and the pH of the sludge is adjusted to 3.9 with 1mol / L HCl solution, the temperature is 62°C, and the EDTA concentration is 9.2mmol / L. Under low-temperature thermal hydrolysis reaction for 1 h. After the reaction, centrifuge at a speed of 3000r / min for 5min to separate the solid and liquid to obtain the supernatant and the thermally hydrolyzed residual solid. The concentration of phosphorus, orthophosphate, ammonia nitrogen, and SCOD in the supernatant c...

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Abstract

The invention discloses a method for improving the recovery efficiency of phosphorus in sludge and promoting anaerobic digestion. The method comprises the following specific steps: 1, pretreating residual sludge of a sewage treatment plant; 2, carrying out pyrohydrolysis on the sludge obtained in step 1, performing crystallizing, and carrying out solid-liquid separation in a centrifuge; 3, precipitating and separating a supernatant separated in the step 2 by using a magnesium ammonium phosphate method; 4, mixing a pyrohydrolysis residual solid matter obtained in the step 2 with a supernatant obtained after separation of a crystallization product in the step 3, and injecting the obtained mixture into an anaerobic digestion reactor for an anaerobic digestion reaction. According to the invention, EDTA is added under the condition of pyrohydrolysis, so the breaking degree of cell walls of the sludge is increased, and moisture existing in the sludge is also released; and the moisture content of the sludge can be reduced to 80% or below through direct dehydration or dehydration after anaerobic digestion, so the transportation and later-stage treatment of the sludge are better facilitated.

Description

technical field [0001] The invention belongs to the technical field of low-temperature thermal hydrolysis sludge, and relates to a method for improving phosphorus recovery efficiency in sludge and promoting anaerobic digestion. Background technique [0002] Sewage treatment plants will produce a large amount of sludge during sewage treatment, which contains a large amount of phosphorus, and if it is discharged directly, it will cause pollution to river water. [0003] Under normal storage conditions, the release rate and amount of phosphorus from sludge are low. At present, the release of phosphorus from sludge mainly uses physical and chemical means such as thermal hydrolysis, acid-base dosing, anaerobic digestion, and oxidation. The release rate of phosphorus is relatively low. It is difficult to effectively release; secondly, using the digested supernatant produced for struvite (MgNH 4 PO 4 ) recovery will have the problem of invalid fouling of the transmission pipeline...

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C02F11/127C02F11/04C01B25/45
CPCC01B25/451C01P2006/80C02F11/04C02F11/10C02F11/12C02F11/127C02F2303/06
Inventor 徐志嫱史可李瑶董雯曹琛洁
Owner XIAN UNIV OF TECH
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