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Sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal

A technology of sludge anaerobic fermentation and treatment method, applied in the field of excess sludge anaerobic treatment, can solve the problems of large release of phosphorus, reduced phosphorus release, low efficiency of organic matter conversion to short-chain fatty acids, etc. The effect of producing acid by oxygen fermentation, reducing the content of orthophosphoric acid and alleviating the impact

Active Publication Date: 2019-07-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of low efficiency of converting organic matter into short-chain fatty acids and large release of phosphorus when the remaining sludge is fermented to produce acid under the alkalinity provided by sodium hydroxide, and proposes a method to improve anaerobic fermentation under alkaline conditions. The conversion efficiency of fermented organic matter and the technology of reducing the release of phosphorus at the same time

Method used

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  • Sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal
  • Sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal
  • Sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal

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Embodiment 1

[0029] In this embodiment, the sludge anaerobic fermentation method for synchronously strengthening acid production and phosphorus removal, the steps are as follows:

[0030] (1) Take 500mL concentrated anaerobic-anoxic-aerobic (A 2 O) The remaining sludge in the process (total suspended solids concentration is 14910mg / L, volatile suspended solids concentration is 6280mg / L, pH=6.83) is added in the reactor, and the sodium hydroxide solution of 2mol / L is used to remove the remaining sludge Adjust the pH to 10, add magnetite to the excess sludge, and the dosage of magnetite is 0.3g / gVSS. Nitrogen was introduced into the excess sludge for 5 minutes to remove the air, and then the closed reactor was stirred for anaerobic fermentation, the fermentation temperature was 35°C, and the stirring speed of the reactor was 120r / min;

[0031] (2) Use 2mol / L sodium hydroxide solution during the reaction to maintain the pH of the reactor at 10±0.1.

[0032] After 10 days of fermentation, th...

Embodiment 2

[0034] In this embodiment, the sludge anaerobic fermentation method for synchronously strengthening acid production and phosphorus removal, the steps are as follows:

[0035] (1) Take 500mL concentrated anaerobic-anoxic-aerobic (A 2 O) The remaining sludge in the process (total suspended solids concentration is 14910mg / L, volatile suspended solids concentration is 6280mg / L, pH=6.83) is added in the reactor, and the sodium hydroxide solution of 2mol / L is used to remove the remaining sludge Adjust the pH to 10, add magnetite to the excess sludge, and the dosage of magnetite is 0.6g / gVSS. Nitrogen was introduced into the excess sludge for 5 minutes to remove the air, and then the closed reactor was stirred for anaerobic fermentation, the fermentation temperature was 35°C, and the stirring speed of the reactor was 120r / min;

[0036] (2) Use 2mol / L sodium hydroxide solution during the reaction to maintain the pH of the reactor at 10±0.1.

[0037] After 10 days of fermentation, th...

Embodiment 3

[0039] In this embodiment, the sludge anaerobic fermentation method for synchronously strengthening acid production and phosphorus removal, the steps are as follows:

[0040] (1) Take 500mL concentrated anaerobic-anoxic-aerobic (A 2 O) The remaining sludge in the process (total suspended solids concentration is 14910mg / L, volatile suspended solids concentration is 6280mg / L, pH=6.83) is added in the reactor, and the sodium hydroxide solution of 2mol / L is used to remove the remaining sludge Adjust the pH to 10, add magnetite to the excess sludge, and the dosage of magnetite is 0.9g / gVSS. Nitrogen was introduced into the excess sludge for 5 minutes to remove the air, and then the closed reactor was stirred for anaerobic fermentation, the fermentation temperature was 35°C, and the stirring speed of the reactor was 120r / min;

[0041] (2) Use 2mol / L sodium hydroxide solution during the reaction to maintain the pH of the reactor at 10±0.1.

[0042] (3) After 10 days of fermentation...

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Abstract

The invention discloses a sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal, and belongs to the field of sludge and sewage treatment. The method includes the steps that (1) excess sludge is added to an anaerobic reaction system, wherein the concentration of total suspended solids (TSS) of the excess sludge is 10000-15000 mg / L, and the concentration of volatile suspended solids (VSS) is 6000-9000 mg / L; (2) the pH value of the excess sludge is adjusted to be 10+ / -0.1 with a sodium hydroxide solution; magnetite is added to the excess sludge with the addition amount of the magnetite being 0.3-0.9 g / gVSS; after air in a reactor is removed, the reactor is sealed, anaerobic fermentation is carried out for 10-15 days in the stirring state, and the pH of the excess sludge is maintained at 10+ / -0.1 all the time in the stirring fermentation process. Compared with a simple alkaline condition, under the condition of the method, the accumulation of short-chain fatty acid is increased by 20% or above, and acid production by anaerobic fermentation of the excess sludge is effectively promoted; besides, the content of orthophosphoric acid in excess sludge fermentation liquor is reduced by 10% or above, and the influence of the fermentation liquor as a carbon source on biological phosphorus removal is alleviated.

Description

technical field [0001] The invention relates to a method for anaerobic treatment of excess sludge, which is suitable for sewage treatment plants with low sewage carbon-nitrogen ratio and difficult treatment of excess sludge, and belongs to the field of sludge and sewage treatment. Background technique [0002] With the continuous increase of sewage treatment volume, the output of surplus sludge in my country's urban sewage treatment plants is also increasing day by day. At the same time, the residual sludge is rich in organic matter, which can be converted into easily bioavailable short-chain fatty acids through anaerobic fermentation to produce acid. Studies have shown that short-chain fatty acids are high-quality carbon sources in biological nitrogen and phosphorus removal during sewage treatment. Therefore, the anaerobic fermentation technology of excess sludge has received extensive attention, but the current classic sodium hydroxide-enhanced acid production technology ...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/00C02F11/15C02F101/10
CPCC02F11/04C02F11/00C02F11/15C02F2101/105C02F1/66C02F2209/06C02F2303/18
Inventor 陆东辉王晨韩泰星朱亮徐向阳
Owner ZHEJIANG UNIV
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