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Method for improving anaerobic fermentation phosphorus release rate of phosphorus-containing chemical-biological mixed sludge

A technology of mixed sludge and anaerobic fermentation, which is applied in the field of improving the phosphorus release rate in the process of sludge anaerobic fermentation and promoting the phosphorus release of sludge anaerobic fermentation, and can solve the problem that the phosphorus release rate of chemical-biological mixed sludge is difficult to further increase and other issues, to achieve the effect of realizing resource utilization, increasing the total phosphorus release rate, and avoiding corrosion

Active Publication Date: 2014-07-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual sludge anaerobic digestion process, maintaining a certain pH value requires consideration of equipment corrosion and the risk of acid and alkali chemicals; Precipitation makes it difficult to further increase the phosphorus release rate of chemical-biological mixed sludge

Method used

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  • Method for improving anaerobic fermentation phosphorus release rate of phosphorus-containing chemical-biological mixed sludge
  • Method for improving anaerobic fermentation phosphorus release rate of phosphorus-containing chemical-biological mixed sludge
  • Method for improving anaerobic fermentation phosphorus release rate of phosphorus-containing chemical-biological mixed sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 400mL of concentrated pure biological sludge and mixed sludge containing aluminum phosphate (total suspended solids concentration is 13.9g / L, volatile suspended solids concentration is 9.3g / L) into different reactors, Add 0.94g EDTA-2Na solid (that is, add 0.17gEDTA-2Na / gTSS), use 6mol / L hydrochloric acid solution and 6mol / L sodium hydroxide solution to maintain pH=7 during anaerobic fermentation, fill with nitrogen for 0.5min, and seal The reactor was anaerobically fermented at 35°C for 8 days. At the same time, the pure biological sludge without EDTA-2Na and the mixed sludge containing aluminum phosphate without EDTA-2Na were used as controls.

[0025] (2) Take a sample every 24 hours, fill the reactor with nitrogen after each sampling, and measure the orthophosphate, dissolved organic carbon (STOC), and volatile fatty acid (VFA) in the anaerobic fermentation supernatant of the two kinds of sludge concentration.

[0026] (3) Measure TSS concentration and VS...

Embodiment 2

[0038](1) Take 400mL of concentrated pure biological sludge and mixed sludge containing iron phosphate (total suspended solids concentration is 14.8g / L, volatile suspended solids concentration is 10.1g / L) into different reactors, Add 1.0g of EDTA-2Na solid (that is, add 0.17gEDTA-2Na / gTSS), use 6mol / L hydrochloric acid solution and 6mol / L sodium hydroxide solution to maintain pH=7 during anaerobic fermentation, fill with nitrogen for 0.5min, and seal The reactor was anaerobically fermented at 35°C for 7 days. At the same time, the anaerobic fermentation of the pure biological sludge without EDTA-2Na and the mixed sludge containing iron phosphate without EDTA-2Na were used as controls.

[0039] (2) Take a sample every 24 hours, fill the reactor with nitrogen after each sampling, and measure the concentrations of orthophosphate, STOC, and total VFA in the supernatants of the anaerobic fermentation of the two sludges.

[0040] (3) The concentrations of TSS and VSS were measured ...

Embodiment 3

[0046] (1) Take 400mL concentrated pure biological sludge and mixed sludge containing aluminum phosphate (total suspended solids concentration is 15g / L, volatile suspended solids concentration is 10.5g / L) into different reactors, respectively Add 3.1g of EDTA-2Na solid (that is, add 0.52gEDTA-2Na / gTSS), maintain the pH during anaerobic fermentation at about 7 (between 6.5 and 7.5), and conduct anaerobic fermentation at 35°C for 5 days in a closed reactor.

[0047] (2) When 0.52g EDTA-2Na / gTSS is added to the mixed sludge containing aluminum phosphate for anaerobic fermentation, after 5 days of anaerobic fermentation, about 66% of the phosphorus in the mixed sludge can be released, and the release of biological sludge The phosphorus rate is 47%, and the phosphorus release rate of aluminum phosphate is about 19%.

[0048] (3) Adding 0.52g EDTA-2Na / gTSS and mixed sludge containing aluminum phosphate for joint anaerobic fermentation, the VSS reduction percentage of the mixed sludg...

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Abstract

The invention relates to a method for improving anaerobic fermentation phosphorus release rate of phosphorus-containing chemical-biological mixed sludge. The method comprises the following steps: placing the phosphorus-containing chemical-biological mixed sludge in a reactor, performing static settling at room temperature for 24h, and discharging supernatant fluid to obtain the concentrated mixed sludge; adding a certain amount of EDTA-2Na according to the content of total suspended solids in the sludge aiming at the chemical-biological mixed sludge produced by using different chemical reagents to remove phosphorus, maintaining the pH value in the anaerobic fermentation process of the mixed sludge at 6.5-7.5, closing the reactor and performing anaerobic fermentation for 5-10 days at the temperature of 30-50 DEG C. According to the method, a large amount of phosphorus in the chemical sludge produced by chemical phosphorous removal is released, the re-precipitation of phosphorous released by anaerobic fermentation of the sludge can be further prevented, and the phosphorous release rate of the mixed sludge can be further improved. Compared with the prior art, by adopting the method provided by the invention, the total phosphorous release rate of the phosphorus-containing chemical-biological mixed sludge can be improved so as to be conductive to improving the recovery rate of later-stage nitrogen and phosphorous resources, and the resource utilization of the remaining sludge can be realized.

Description

technical field [0001] The invention relates to a technique for promoting phosphorus release by sludge anaerobic fermentation and improving the phosphorus release rate in the sludge anaerobic fermentation process, in particular to a technique for improving the phosphorus release rate in the anaerobic fermentation process of phosphorus-containing chemical-biological mixed sludge Methods. Background technique [0002] As a non-renewable resource, phosphorus is becoming more and more scarce. At the same time, excessive phosphorus content in water will lead to eutrophication and damage the water environment. At present, the removal of phosphorus in sewage is mainly through biologically enhanced phosphorus removal (EBPR) and chemical phosphorus removal to transfer phosphorus from sewage to sludge. Considering that the bio-enhanced phosphorus removal method is unstable and it is difficult to ensure the quality of the effluent, the chemical phosphorus removal method is widely used...

Claims

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Application Information

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IPC IPC(8): C02F11/04
Inventor 李咏梅张丽丽
Owner TONGJI UNIV
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