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Method for promoting phosphorus release and gas production of phosphate-precipitate-containing sludge under room temperature condition

A technology of phosphate precipitation and sludge, applied in biological sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Gas production inhibition and other problems, to achieve the effect of resource utilization, increase phosphorus release capacity, and increase methane production

Active Publication Date: 2018-05-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of sludge anaerobic digestion, the added EDTA-2Na has a strong destructive effect on microorganisms due to its strong toxicity, which is not conducive to the subsequent anaerobic fermentation of microorganisms to produce gas, and the sludge gas production is severely inhibited
In addition, the operating temperature of this technology is under the condition of medium and high temperature of 30-50°C, and the cost is relatively high

Method used

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  • Method for promoting phosphorus release and gas production of phosphate-precipitate-containing sludge under room temperature condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 500mL of concentrated pure biological sludge and sludge containing iron phosphate (total suspended solids concentration is 14.4g / L, volatile suspended solids concentration is 7.5g / L) into different reactors, add 0.882g Trisodium citrate solid (that is, adding 0.12g trisodium citrate / gTSS), driving oxygen to form an anaerobic environment, anaerobic fermentation in a closed reactor at 20-30°C for 7 days. At the same time, pure biological sludge without trisodium citrate and iron phosphate-containing sludge without trisodium citrate were used as controls.

[0031] Samples were taken every 24 hours. After each sampling, oxygen was driven away to form an anaerobic environment. The reactor was closed to measure orthophosphate, dissolved organic carbon (STOC), and volatile fatty acids (VFA) in the anaerobic fermentation supernatant of two kinds of sludge. ) concentration and methane production.

[0032] refer to figure 1 , when no trisodium citrate is added to the sludg...

Embodiment 2

[0036] Take 500mL of concentrated pure biological sludge and sludge containing iron phosphate (total suspended solids concentration is 14.4g / L, volatile suspended solids concentration is 7.5g / L) into different reactors, add 1.3235g Trisodium citrate solid (that is, adding 0.18g trisodium citrate / gTSS), driving oxygen to form an anaerobic environment, anaerobic fermentation in a closed reactor at 20-30°C for 7 days. At the same time, the pure biological sludge without trisodium citrate and the sludge containing iron phosphate without trisodium citrate were used as controls.

[0037] Samples were taken every 24 hours. After each sampling, oxygen was driven away to form an anaerobic environment. The reactor was closed to measure orthophosphate, dissolved organic carbon (STOC), and volatile fatty acids (VFA) in the anaerobic fermentation supernatant of two kinds of sludge. ) concentration and methane production.

[0038] When adding 0.37g trisodium citrate / gTSS and mixed sludge f...

Embodiment 3

[0042] Take 500mL of concentrated pure biological sludge and sludge containing aluminum phosphate (total suspended solids concentration is 14.4g / L, volatile suspended solids concentration is 7.5g / L) into different reactors, add 1.3235g Trisodium citrate solid (that is, adding 0.18g trisodium citrate / gTSS), driving oxygen to form an anaerobic environment, anaerobic fermentation in a closed reactor at 20-30°C for 7 days. At the same time, the anaerobic fermentation of pure biological sludge without trisodium citrate and aluminum phosphate sludge without trisodium citrate was used as a control.

[0043] Samples were taken every 24 hours. After each sampling, oxygen was driven away to form an anaerobic environment. The reactor was closed to measure orthophosphate, dissolved organic carbon (STOC), and volatile fatty acids (VFA) in the anaerobic fermentation supernatant of two kinds of sludge. )concentration.

[0044] After 7 days of anaerobic fermentation, when 0.18g trisodium cit...

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Abstract

The invention relates to a method for promoting the phosphorus release and the gas production of phosphate-precipitate-containing sludge under a room temperature condition. The method comprises: placing phosphate-precipitate-containing sludge in a reactor, carrying out static precipitation at a room temperature, and discharging the supernatant to obtain concentrated mixed sludge; adding trisodiumcitrate according to the total suspended solid content of the sludge, sealing the reactor, and carrying out anaerobic fermentation for more than 7 days under a room temperature condition, wherein thephosphorus release rate of the sludge can be increased, and the anaerobic fermentation of the sludge can be promoted so as to produce acid and methane. Compared to the method in the prior art, the method of the present invention has the following characteristics that the phosphorus release in the phosphate-precipitate-containing sludge can be promoted sp as to improve the recovery rate of the phosphorus resource at the late stage and promote the anaerobic fermentation of the sludge to produce acid and gas, and achieve the resource utilization of the residual sludge, and the operation is performed at the room temperature, such that the economic cost is low.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a method for promoting phosphorus release and gas production of sludge containing phosphate precipitation at room temperature. Background technique [0002] Phosphorus is being paid more and more attention as an irreplaceable resource. The limited phosphate rock reserves are gradually unable to meet the needs of the development of human society. At the same time, humans discharge phosphorus into the environment in the process of production and life, which leads to eutrophication of water bodies. Therefore, the enrichment and recovery of phosphorus from sewage is a method in line with sustainable development. At present, the method of recovering phosphorus is mainly to separate phosphorus from the solution by crystallization precipitation. For example, the struvite crystallization precipitation method can use nitrogen, phosphorus, and magnesium elements in the solution to obtain slow...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F101/10
CPCC02F11/04C02F2101/105Y02E50/30
Inventor 李咏梅卢霄平倩卢可馨郑明
Owner TONGJI UNIV
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