Optimization method for fertilizer wastewater treatment process

A technology for wastewater treatment and process optimization, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. The effect of improving total nitrogen removal capacity, improving carbon-nitrogen ratio, and high compactness

Active Publication Date: 2011-10-26
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the process operation of many treatment plants is affected by various conditions such as water quality conditions, operation management, and funds, and the removal effect of total nitrogen is not high, and there are cases where total nitrogen exceeds the standard.

Method used

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  • Optimization method for fertilizer wastewater treatment process
  • Optimization method for fertilizer wastewater treatment process
  • Optimization method for fertilizer wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The technological process of the fertilizer wastewater treatment system is: regulating tank - primary aeration tank - primary sedimentation tank - A / O (anoxic tank - aerobic tank) - secondary sedimentation tank - flocculation sedimentation tank - effluent.

[0046] In this example, the high-concentration ammonia nitrogen and COD waste water from the fertilizer plant is aerated through the blower aeration tube at the bottom of the regulating tank to make it evenly mixed.

[0047] The operation regulation of the initial exposure tank is very critical to the operation effect of the whole system. The main function of the initial aeration tank is to remove part of the COD in the wastewater. The COD removal rate of this pond directly affects the supply of carbon source required for denitrification in the subsequent anoxic pond. As a main factor affecting the COD removal rate of the initial exposure tank, DO's optimal regulation is extremely important.

[0048] After the eff...

Embodiment 2

[0051] The denitrification effect of the A / O section directly affects the total nitrogen removal efficiency of the process. The control operation parameters are: initial aeration tank DO is 0.8mg / L, sludge reflux ratio r 1 100%; the DO of the aerobic tank is 2.4 mg / L, the pH is controlled between 7.5-8.0, the sludge concentration MLSS is 3000mg / L, and the sludge reflux ratio is r 2 75%.

[0052] Through the adjustment of water quality by the regulating tank, when R=200%, the average concentration of COD, ammonia nitrogen and total nitrogen in the system feed water are 435.87mg / L, 53.91mg / L and 57.30mg / L respectively; when R=300%, the system The average concentrations of influent COD, ammonia nitrogen, and total nitrogen are 518.40mg / L, 82.15mg / L, and 86.30mg / L respectively; when R=400%, the average concentrations of system influent COD, ammonia nitrogen, and total nitrogen are 434.07mg / L, 68.93mg / L and 73.84mg / L.

[0053] Figure 5 It is the change chart of COD removal ef...

Embodiment 3

[0058] When the water quality is relatively stable, working condition 1 adopts the parameters before optimization: DO in the initial aeration tank is 0.9mg / L, and the sludge return ratio is r 1 is 100%, the DO in the aerobic tank is 2.0mg / L, the pH is 7.5~8.0, the reflux ratio of nitrifying liquid is 400%, and the sludge reflux ratio is r 2 75%. Working condition 2 is operated with optimized parameters: initial aeration tank DO is 0.9mg / L, sludge reflux ratio r 1 is 100%, the DO in the aerobic tank is 2.0mg / L, the pH is 7.5~8.0, the reflux ratio of nitrifying liquid is 300%, and the sludge reflux ratio is r 2 is 100%.

[0059] The operation results under different working conditions are shown in Table 1. In the table, except for the removal rate (%), the units of other indicators are mg.L -1 .

[0060] Table 1 Comparative analysis of running results under different working conditions

[0061]

[0062] The operation results show that the optimized process parameters a...

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Abstract

The present invention provides an optimization method for a fertilizer wastewater treatment process. The original process comprises the following steps of: homogenizing and weight-equalizing fertilizer wastewater by an adjusting tank, pumping the wastewater from the adjusting tank to a primary aeration tank by a wastewater pump to remove part of COD (chemical oxygen demand) and toxic and harmful substances in the wastewater; and introducing the primarily settled wastewater into the front denitrification biological denitrogenation section and subsequent physical and chemical advanced treatmentsection of an anoxic tank/aerobic tank, and simultaneously adding high-efficiency microbial flora to a biochemical system. By optimizing the dissolved oxygen concentration of the primary aeration tank and nitrification liquid reflux ratio R and sludge reflux ratio r2 of the front denitrification biological denitrogenation section of the anoxic tank/aerobic tank, the optimization method improves the total nitrogen removal rate of the fertilizer wastewater from 41.1% to 66.7% (increased by 25.6%) and improves the COD and ammonia nitrogen removal rates to 95.8% and 98.8%, respectively.

Description

technical field [0001] The invention relates to an optimization method of a chemical fertilizer wastewater treatment process, which is particularly effective for the transformation and optimization of the chemical fertilizer wastewater denitrification process. Background technique [0002] In recent years, the eutrophication of rivers, lakes and other water bodies in my country has become more and more serious, resulting in continuous deterioration of water bodies and affecting the survival of aquatic organisms. One of the most important causes of water eutrophication is nitrogen pollution. Therefore, the denitrification effect of the sewage treatment plant treatment process has received more and more attention. [0003] In my country, most of the sewage treatment plants that have been established, especially the sewage treatment plants built in the 1990s that require denitrification, have adopted the A / O pre-denitrification biological denitrification process. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 周少奇彭华平张战利
Owner SOUTH CHINA UNIV OF TECH
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