Wastewater treatment method capable of realizing sulfur synergy denitrification simultaneous nitrogen and phosphorous removal

A technology for simultaneous denitrification and phosphorus removal, and wastewater treatment. It can be used in anaerobic digestion and other directions to solve problems such as increased treatment costs, accumulation of nitrite, and difficulty in controlling the production of elemental sulfur, resulting in low sludge yield and high treatment efficiency. Effect

Active Publication Date: 2014-10-15
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional nitrogen and phosphorus removal process is difficult to achieve good results in the treatment of saline wastewater. At the same time, toxic and harmful gases such as hydrogen sulfide are produced, and the output of residual sludge is high, which increases the difficulty of subsequent treatment and high process operating costs.
[0003] For the treatment of saline wastewater, especially sulfate-containing wastewater, the method of reducing sulfate to sulfide and then oxidation to elemental sulfur is usually used, but the separation of elemental sulfur limits its practical engineering application
At the same time, in the treatment of wastewater containing organic matter, sulfur, and nitrogen, many studies have used sulfur autotrophic denitrifying bacteria for treatment, which leads to the accumulation of nitrite, and the production of elemental sulfur is difficult to control
Due to the slow growth of sulfur autotrophic denitrifying bacteria, it is difficult to increase the treatment load and increase the treatment cost
However, the removal of phosphorus in this kind of saline wastewater has not received enough attention.

Method used

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  • Wastewater treatment method capable of realizing sulfur synergy denitrification simultaneous nitrogen and phosphorous removal
  • Wastewater treatment method capable of realizing sulfur synergy denitrification simultaneous nitrogen and phosphorous removal
  • Wastewater treatment method capable of realizing sulfur synergy denitrification simultaneous nitrogen and phosphorous removal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Start the reaction device:

[0044] ①Start the first stage: Add 10L of anaerobic activated sludge mud-water mixture (collected from Hong Kong Shatin Sewage Treatment Plant) with an initial sludge concentration of 5.98g SS / L into the batch activated sludge reactor, and remove the upper After clear liquid 5L, enter 5L synthetic waste water (its component content is shown in Table 1) and carry out sludge domestication, improve its microbial activity simultaneously with the environment that domesticated microorganisms adapt to the presence of phosphate; Described synthetic waste water contains carbon source, sulfur source As well as the phosphorus source, the carbon source is provided by sodium acetate; the initial concentration of acetate in the synthetic wastewater is 150mg C / L; the sulfur source is provided by sodium sulfate, and the initial concentration of sulfate in the synthetic wastewater is 200mg S / L, the phosphorus source is provided by dipotassium hydrogen pho...

Embodiment 2

[0055] (1) The start-up of reaction device is with reference to embodiment 1;

[0056] (2) The strengthening of sulfur synergistic denitrification denitrification and phosphorus removal microorganisms refers to Example 1;

[0057] (3) Stable operation of wastewater treatment system:

[0058] Using artificially synthesized wastewater (Table 1) as the influent, the conditions for stable operation are: use mechanical agitation, the agitator is a standard four-leaf helical type, the agitation speed is maintained at 400rpm, the reaction temperature is 10°C, the pH of the influent water is 7, and the hydraulic retention is The time is 48 hours; among them, the period of anaerobic phosphorus release is 10 hours, and the period of anoxic phosphorus absorption is 14 hours. In the stage of anoxic phosphorus absorption, potassium nitrate is added, and the concentration of potassium nitrate in the reactor is maintained at 20mg N / L , After the whole process, the removal rate of acetate, n...

Embodiment 3

[0060] (1) The start-up of reaction device is with reference to embodiment 1;

[0061] (2) The strengthening of sulfur synergistic denitrification denitrification and phosphorus removal microorganisms refers to Example 1;

[0062] (3) Stable operation of wastewater treatment system:

[0063] Using artificially synthesized wastewater (Table 1), the conditions for stable operation are: using mechanical stirring, the stirring blade is a standard four-leaf helical type, the stirring speed is maintained at 400rpm, the reaction temperature is 20°C, the pH of the influent is 7, and the hydraulic retention time is 17h; Among them, the anaerobic phosphorus release stage time is 5h, the anoxic phosphorus uptake stage time is 3.5h, potassium nitrate is added in the anoxic phosphorus uptake stage, and the concentration of potassium nitrate in the reactor is maintained at 20mg N / L after the addition, the whole After the process, the removal rate of acetate and nitrate can reach 100%, and ...

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Abstract

The invention relates to a wastewater treatment method, particularly to the wastewater treatment method capable of realizing sulfur synergy denitrification simultaneous nitrogen and phosphorous removal. The wastewater treatment method comprises the steps as follows: (1) starting of a reaction device; (2) intensification of sulfur synergy denitrification nitrogen and phosphorous removal microbes; (3) stable operation of a wastewater treatment system. According to the method, all substances are converted under the microbial action, organic matters in inlet water are degraded into carbon dioxide, sulfate radials are firstly converted into sulfides and then oxidized into the sulfate radials to finish a cycle, and meanwhile, nitrate radials added under the condition that the organic matters are consumed are converted into nitrogen. At an anaerobic phosphorus release stage of the system, the conversion rate of the sulfides is up to 30% and the removal rate of the organic matters is up to 95%; at an anoxic phosphorus absorption stage of the system, the conversion rate of nitrate to nitrogen is up to 98%, the conversion rate of the sulfate is up to 90%, and meanwhile, the phosphorus removal effect is up to 80%.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method for synchronous denitrification and phosphorus removal through sulfur synergistic denitrification. Background technique [0002] With the growth of population and the rapid development of economy in our country, the problem of water pollution is becoming more and more serious, especially the problem of eutrophication of water body. The removal of organic pollutants and nutrients such as nitrogen and phosphorus has gradually become a research hotspot in the field of wastewater treatment. Due to the developed economy, the coastal areas are facing a more serious water shortage problem. Based on this, the development and utilization of seawater has become particularly important, and the problem of saline wastewater treatment has also received high attention. The traditional nitrogen and phosphorus removal process is difficult to achieve good results in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 吕慧陈光浩
Owner SUN YAT SEN UNIV
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