Method for improving phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation

A technology for sludge anaerobic fermentation and phosphorus release, which is applied in biological sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of phosphorus not being released, and achieve increased phosphorus concentration, good Maneuverability and controllability, effect of overcoming re-sedimentation

Inactive Publication Date: 2015-05-13
TONGJI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The patent application with publication number CN103204613A discloses a method for extracting phosphorus in phosphorus-containing chemical-biological mixed sludge. This method adjusts different pH values ​​to make the phosphorus release rate re...

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  • Method for improving phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation
  • Method for improving phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation
  • Method for improving phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Take 400mL of concentrated FePO-free 4 Biological sludge, containing FePO 4 The mixed sludge (total suspended solids concentration is 11.20g / L, volatile suspended solids concentration is 7.11g / L) is put into different reactors, and Na 2 S makes its concentration 0.04gNa 2 S / gTSS was anaerobically fermented in a closed reactor at 35°C for 7 days. At the same time without adding Na 2 The reactor of S served as a control.

[0024] (2) Sampling once every 24 hours, measuring the orthophosphate (PO 4 3- -P), concentrations of dissolved organic carbon (STOC), volatile fatty acids (VFA).

[0025] (3) Measure TSS concentration and VSS concentration after 7 days of anaerobic fermentation.

[0026] (4) The phosphorus release rates of mixed sludge, biological sludge and chemical sludge were calculated by formulas (1), (2) and (3) respectively under different conditions.

[0027]

[0028]

[0029]

[0030] Where: P T —Concentration of total phosphorus in muddy...

Embodiment 2

[0037] (1) Take 400mL of concentrated FePO-free 4 Biological sludge, containing FePO 4 The mixed sludge (total suspended solids concentration is 13.80g / L, volatile suspended solids concentration is 9.42g / L) is put into different reactors, and Na 2 S makes its concentration 0.13gNa 2 S / gTSS was anaerobically fermented in a closed reactor at 35°C for 8 days. At the same time without adding Na 2 The reactor of S served as a control.

[0038] (2) Sampling once every 24 hours, measuring the orthophosphate (PO 4 3- -P), dissolved organic carbon (STOC), volatile fatty acid (VFA) concentration

[0039] (3) Measure TSS concentration and VSS concentration after 8 days of anaerobic fermentation.

[0040] (4) Dosing 0.13gNa 2 S / gTSS with FePO 4 When the mixed sludge is jointly anaerobically fermented, about 77% of the phosphorus in the mixed sludge can be released after 8 days of anaerobic fermentation, and the phosphorus release rate of the biological sludge is 36%. 4 The phosp...

Embodiment 3

[0044] (1) Take 400mL of concentrated FePO-free 4 Biological sludge, containing FePO 4 The mixed sludge (total suspended solids concentration is 16.00g / L, volatile suspended solids concentration is 10.60g / L) is put into different reactors, and Na 2 S makes its concentration 0.20gNa 2 S / gTSS was anaerobically fermented in a closed reactor at 35°C for 5 days. At the same time without adding Na 2 The reactor of S served as a control.

[0045] (2) Sampling once every 24 hours, measuring the orthophosphate (PO 4 3- -P), dissolved organic carbon (STOC), volatile fatty acid (VFA) concentration

[0046] (3) Measure TSS concentration and VSS concentration after 5 days of anaerobic fermentation.

[0047] (4) Add 0.20gNa 2 S / gTSS with FePO 4 When the mixed sludge is jointly anaerobically fermented, about 83% of the phosphorus in the mixed sludge can be released after anaerobic fermentation for 5 days, and the phosphorus release rate of the biological sludge is 38%. 4 The phosph...

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Abstract

The invention relates to a method for improving the phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation. The method comprises the following steps: placing concentrated iron phosphate-containing sludge into a reactor; adding a certain amount of Na2S into the reactor according to the total content of suspended solids in the concentrated iron phosphate-containing sludge; closing the reactor for 5-10 days' anaerobic fermentation at 30-40 DEG C, so that a large amount of phosphorus can be released from the iron phosphate-containing sludge generated during chemical phosphorus removal, and especially the release of chemical phosphorus can be promoted. Compared with the prior art, the method provided by the invention has the advantages that the phosphorus release rate of the iron phosphate-containing sludge during anaerobic fermentation can be improved, the release of organics can also be promoted, the phosphorus recovery rate in the later period can be improved, and the sludge can be further recycled and reduced. Meanwhile, the defects that the accumulated concentration of phosphorus in a surplus sludge supernatant obtained according to a pure fermentation method is low, much biological phosphorus is released during anaerobic fermentation according to a pH adjustment method, but the release of chemical phosphorus during anaerobic fermentation according to the pH adjustment method is restricted, and released phosphorus is easy to re-precipitate can be overcome. The method is higher in operability and controllability.

Description

technical field [0001] The invention belongs to the field of sludge treatment and phosphorus resource recovery, and relates to a technology for promoting the release of phosphorus by anaerobic fermentation of sludge, in particular to a method for increasing the release rate of phosphorus in the anaerobic fermentation process of iron phosphate-containing sludge. Background technique [0002] As a non-renewable resource on the earth, the shortage of phosphorus resources is becoming more and more severe. At the same time, excessive phosphorus content in water can stimulate the growth of algae and other photosynthetic microorganisms and cause eutrophication, which has become one of the main environmental problems and seriously restricts the sustainable development of society and economy. [0003] How to effectively remove phosphorus and recover phosphorus resources has always been the focus of attention. At present, the removal of phosphorus in sewage is mainly through biologic...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCC02F11/04C02F2101/105C02F2101/203
Inventor 李咏梅孙静王策李贾丞曹特特吴健
Owner TONGJI UNIV
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