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A method of using sodium carbonate to provide alkalinity to realize high-efficiency nitrification of high-concentration ammonia nitrogen wastewater

A technology of ammonia nitrogen wastewater and sodium carbonate is applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., to achieve the effect of cost saving and simple operation method.

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the present invention solves the problem of high pH value and free ammonia inhibiting all microbial activities caused by the addition of sodium carbonate as an exogenous alkalinity by means of step-by-step dosing of sodium carbonate and multi-stage nitrosation

Method used

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  • A method of using sodium carbonate to provide alkalinity to realize high-efficiency nitrification of high-concentration ammonia nitrogen wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] A method for providing alkalinity with sodium carbonate to realize high-efficiency nitrification of high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0040] (1) The film-hanging domestication method of two biofilm reactors:

[0041] ① Adsorption of ammonia nitrogen by filler: add natural zeolite with a particle size of 0.5-2 mm to two biofilm reactors respectively, add sodium carbonate as alkalinity according to alkalinity: ammonia nitrogen = 4:1 (alkalinity is calculated as calcium carbonate), and continuously Influent, the concentration of ammonia nitrogen in the influent is 250mg / L, the residence time is 8h, the dissolved oxygen in the reactor is controlled at 0.1-7.0mg / L, and the temperature is 20-40°C; until the concentration of ammonia nitrogen in the effluent is about 150mg / L, this step is completed ;

[0042] ②Packing film on filler: After completing ①, add aerobic nitrification sludge, the ratio of the mass of sludge added to th...

Embodiment 2

[0045] A method for providing alkalinity with sodium carbonate to realize high-efficiency nitrification of high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0046] (1) the start of two biofilm reactors is the same as Example 1;

[0047] (2) the ammonia nitrogen concentration of ammonia nitrogen wastewater in the water storage device is 600mg / L, by alkalinity: ammonia nitrogen=4:1 (alkalinity is calculated in calcium carbonate) to calculate sodium carbonate dosage, carry out partial nitrosation; The sodium is divided into two equal parts, that is, the first part of sodium carbonate and the second part of sodium carbonate; the first part of sodium carbonate is added to the water storage device, and the first part of sodium carbonate is mixed evenly with the ammonia nitrogen waste water in the water storage device to obtain the added Ammonia nitrogen wastewater added with sodium carbonate; then the ammonia nitrogen wastewater added with sodium carb...

Embodiment 3

[0049] A method for providing alkalinity with sodium carbonate to realize high-efficiency nitrification of high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0050] (1) The making of two biofilm reactors and the cultivation of the biofilm were the same as in Example 1.

[0051](2) the ammonia nitrogen concentration of ammonia nitrogen wastewater in the water storage device is 800mg / L, by alkalinity: ammonia nitrogen=4:1 (alkalinity is calculated in calcium carbonate) to calculate sodium carbonate dosage, carry out partial nitrosation; The sodium is divided into two equal parts, that is, the first part of sodium carbonate and the second part of sodium carbonate; the first part of sodium carbonate is added to the water storage device, and the first part of sodium carbonate is mixed evenly with the ammonia nitrogen waste water in the water storage device to obtain the added Ammonia nitrogen wastewater added with sodium carbonate; then the ammonia ni...

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Abstract

The invention belongs to the technical field of ammonia-nitrogen wastewater treatment, and discloses a method for high-efficiency nitrosation of high-concentration ammonia-nitrogen wastewater with sodium carbonate for providing alkalinity. The method comprises the steps: (1) biological film hanging is performed in bioreactors containing a filler; and the bioreactors include a first-stage bioreactor and a second-stage bioreactor; and (2) a first part of sodium carbonate is added into an inlet water storage device, and the first part of sodium carbonate is mixed with the ammonia-nitrogen wastewater evenly; then ammonia-nitrogen wastewater having addition of sodium carbonate is sent into the first-stage bioreactor and is subjected to nitrosation, and effluent after nitrosation goes into an intermediate water storage device; and a second part of sodium carbonate is added to the intermediate water storage device and is mixed evenly, then the wastewater in the intermediate water storage device is sent to the second-stage bioreactor, and nitrosation is continued, and water is discharged after the reaction is finished. The method solves the problem that sodium carbonate as a foreign alkalinity is added to cause high pH value and the problem that the microbial activity is inhibited by free ammonia; the method has lower cost.

Description

technical field [0001] The invention belongs to the technical field of ammonia-nitrogen wastewater treatment, and in particular relates to a method for realizing high-efficiency nitrosation of high-concentration ammonia-nitrogen wastewater by providing alkalinity with sodium carbonate. Background technique [0002] The ammonia nitrogen in the wastewater is discharged into the natural water body, causing eutrophication of the natural water body and deteriorating the water quality. Therefore, the ammonia nitrogen in the wastewater must be removed to meet the discharge standard. Biological removal of ammonia nitrogen in wastewater is currently the most commonly used and most economical treatment method. According to the principle of biological denitrification, there are three main biological denitrification processes: (1) Nitrification and denitrification: This is the most commonly used denitrification process at present, such as A in a sewage treatment plant 2 O method, oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F2101/16
Inventor 汪晓军冯兴会陈振国
Owner SOUTH CHINA UNIV OF TECH
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