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Method for Improving Phosphorus Release Rate of Phosphorous Chemical-Biological Mixed Sludge Anaerobic Fermentation

A technology of mixed sludge and anaerobic fermentation is applied in the field of improving the phosphorus release rate in the process of sludge anaerobic fermentation and promoting the phosphorus release rate of sludge anaerobic fermentation, which can solve the problem that the phosphorus release rate of chemical-biological mixed sludge is difficult to be further improved. and other problems, to achieve the effect of resource utilization, promotion of reduction, and improvement of total phosphorus release rate

Active Publication Date: 2015-07-29
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 Phosphorus Release Rate of Phosphorous Chemical-Biological Mixed Sludge Anaerobic Fermentation
  • Method for Improving Phosphorus Release Rate of Phosphorous Chemical-Biological Mixed Sludge Anaerobic Fermentation
  • Method for Improving Phosphorus Release Rate of Phosphorous Chemical-Biological Mixed Sludge Anaerobic Fermentation

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) and put them into different reactors. Add 0.94g EDTA-2Na solid (ie 0.17g EDTA-2Na / gTSS) respectively, 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, airtight The reactor was subjected to anaerobic fermentation 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 24h, fill with nitrogen after each sample, close the reactor, and measure the orthophosphate, dissolved organic carbon (STOC) and volatile fatty acid (VFA) in the supernatant of the two sludge anaerobic fermentation concentration.

[0026] (3) Measure TSS concen...

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) and put them into different reactors. Add 1.0g EDTA-2Na solid (that is, add 0.17g EDTA-2Na / gTSS) respectively, 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, airtight The reactor was subjected to anaerobic fermentation at 35°C for 7 days. At the same time, anaerobic fermentation of pure biological sludge without EDTA-2Na and mixed sludge containing iron phosphate without EDTA-2Na was performed as a control.

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

[0040] (3) Measure the concentration of TSS...

Embodiment 3

[0046] (1) Take 400 mL of 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 EDTA-2Na solid (that is, add 0.52g EDTA-2Na / gTSS), maintain the pH of about 7 (between 6.5 and 7.5) during the anaerobic fermentation process, and keep the closed reactor at 35°C for 5 days for anaerobic fermentation.

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

[0048] (3) Adding 0.52gEDTA-2Na / gTSS and aluminum phosphate-containing mixed sludge co-anaerobic fermentation, the mixed sludge VSS reduction percen...

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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 technology for promoting phosphorus release by anaerobic fermentation of sludge and increasing the phosphorus release rate during anaerobic fermentation of sludge, in particular to a technology for improving phosphorus release rate during anaerobic fermentation of chemical-biological mixed sludge containing phosphorus Methods. Background technique [0002] Phosphorus as a non-renewable resource is becoming more and more scarce. At the same time, excessive phosphorus content in the water body 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. Taking into account the unstable operation of the bio-enhanced phosphorus removal method, it is difficult to ensure the quality of the effluent, and the chemical phosphorus removal method is w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
Inventor 李咏梅张丽丽
Owner TONGJI UNIV
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