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Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge

A technology of mixing sludge and phosphorus elements, which is applied in biological sludge treatment, chemical instruments and methods, sludge treatment, etc. Effect

Active Publication Date: 2013-07-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are domestic and foreign patents on the use of anaerobic digestion to recover carbon sources and nitrogen and phosphorus elements in excess sludge. Most of the research is mainly concentrated on biological sludge, and for the recovery of phosphorus in phosphorus-containing chemical-biological mixed sludge, There are few reports on improving phosphorus recovery efficiency, and there are no related patents

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  • Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge
  • Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge

Examples

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Effect test

Embodiment 1

[0023] (1) Take 400mL concentrated pure biological sludge (total suspended solids concentration is 11.5g / L, volatile suspended solids concentration is 8.5g / L) into different reactors, use 6mol / L hydrochloric acid solution and 6mol / L sodium hydroxide solution maintains pH=3 during the anaerobic digestion process, and at the same time, do anaerobic digestion test of biological sludge without controlling the pH value, fill with nitrogen for 0.5min, and conduct anaerobic digestion in a closed reactor at 35°C for 7 sky.

[0024] Take 400mL of concentrated aluminum-salt-containing mixed sludge and put them into different reactors for anaerobic digestion test. The test method is the same as above.

[0025] (2) Take a sample every 24 hours to measure the concentration of orthophosphate, dissolved organic carbon (STOC) and volatile fatty acid (VFA) in the anaerobic digestion supernatant of the two kinds of sludge.

[0026] (3) Measure TSS concentration and VSS concentration after 7 da...

Embodiment 2

[0037] (1) Take 400mL concentrated pure biological sludge (the concentration of total suspended solids is 10.8g / L, the concentration of volatile suspended solids is 8.1g / L) into different reactors, and use 6mol / L hydrochloric acid solution and 6 mol / L sodium hydroxide solution maintained pH=7 during the anaerobic digestion process, filled with nitrogen for 0.5 min, and anaerobically digested in a closed reactor at 35°C for 7 days.

[0038] Take 400mL of concentrated ferric phosphate-containing mixed sludge and put them into different reactors for anaerobic digestion test. The test method is the same as above.

[0039] (2) Take a sample every 24 hours, and measure the concentration of orthophosphate, STOC and VFA in the anaerobic digestion supernatant of the two kinds of sludge.

[0040] (3) The concentrations of TSS and VSS were measured after 7 days of anaerobic digestion of mixed sludge.

[0041] (4) With embodiment 1, utilize formula (1), (2), (3) to calculate the total ph...

Embodiment 3

[0046] A method for extracting phosphorus in phosphorus-containing chemical-biological mixed sludge, the method comprising the following steps:

[0047] (1) Put phosphorus-containing chemical-biological mixed sludge (sludge after chemically assisted phosphorus removal treatment by adding aluminum salt) in the reactor, let it settle at room temperature for 24 hours, and discharge the supernatant to obtain the remaining sludge mud;

[0048] (2) Use 6mol / L sodium hydroxide solution and 4mol / L hydrochloric acid solution to adjust and maintain the pH value of the remaining sludge at 2, close the reactor, and perform anaerobic digestion at 30°C for 7 days, then both The biological phosphorus in the phosphorus-containing chemical-biological mixed sludge releases chemical phosphorus.

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Abstract

The invention relates to a method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge. The method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge comprises the following steps of: placing phosphorus containing chemical-biological mixed sludge in a reactor, standing and precipitating for 24 hours at room temperature, and discharging supernate to obtain excess sludge; and adjusting and maintaining pH value of the excess sludge to be 2-8, closing the reactor, and carrying out anaerobic digestion for 7 days at the temperature of 30-50 DEG C, so that both biological phosphorus and chemical phosphorus in the phosphorus containing chemical-biological mixed sludge are released. Compared with the prior art, for the mixed sludge containing aluminium phosphate or iron phosphate, 60-80% of phosphorus in the mixed sludge can be released while the pH value is maintained to be 2-8, and 10-30% more phosphorus is released compared with the condition that the pH value is not adjusted; the digestion rate of an organic matter (in soluble organic carbon) can be 25-60 higher compared with the condition that the pH value is not adjusted; and the method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge can improve phosphorus release rate in anaerobic digestion of the chemical-biological mixed sludge, is beneficial to release of organic matter and reduction of sludge and has significance on sludge recycling and reduction.

Description

technical field [0001] The invention relates to a technique for recovering phosphorus from excess sludge, in particular to a method for extracting phosphorus from phosphorus-containing chemical-biological mixed sludge. Background technique [0002] Phosphorus is an indispensable inorganic nutrient element for the growth of animals and plants, and plays an important role in the composition and metabolism of the protoplasm of organisms. Phosphorus rock, as a non-renewable natural resource, is becoming more and more scarce, and the cost of mining is getting higher and higher. come higher. After human production and use, most of phosphorus enters the sewage. If it is not properly treated, it will lead to eutrophication of the water body and damage the water environment. At present, the removal of phosphorus in sewage is mainly through the bio-enhanced phosphorus removal process (EBPR), which transfers the phosphorus in the water to the sludge, and the purpose of phosphorus remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 李咏梅张丽丽
Owner TONGJI UNIV
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