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A method for treating ammonia nitrogen in acidic wastewater containing heavy metals

A technology of acid wastewater and treatment method, which is applied in the field of ammonia nitrogen treatment, can solve the problems of affecting the activity of nitrifying bacteria, failing to meet the demand, and affecting the removal rate of ammonia nitrogen, etc., and achieve the effect of increasing the intensity of biological purification, increasing the speed of sewage purification, and low operating costs

Active Publication Date: 2019-02-01
胡大苇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when using biological methods to remove ammonia nitrogen, if there are heavy metals in the wastewater, it will affect the activity of nitrifying bacteria and have a certain impact on the removal rate of ammonia nitrogen
Therefore, traditional wastewater treatment methods cannot meet the demand at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for treating ammonia nitrogen in acidic wastewater containing heavy metals, comprising the following steps:

[0022] 1) Use chabazite and blast furnace steel slag to crush into 100-mesh slag powder in a ratio of 1:2 to make it easy to react, plasticize at 700°C, and then place it at 1500°C for 15 minutes, and the mass ratio is 0.05:1 The proportion of the water is put into water to undergo a hydrothermal reaction with water. The hydrothermal reaction is carried out at a temperature of 300 ° C. The reaction time is 25 hours. The ratio is 0.0002:1 into the wastewater to remove heavy metals;

[0023] 2) Continue to add cationic polymer cationic polyacrylamide, which is suitable for flocculating organic matter in an acidic environment, to the wastewater to generate flocculated organic matter, place it in a flotation tank, and use air jet swirl floating device to generate air bubbles. The air bubbles contact the acidic wastewater, and the toxic cyanide in the waste...

Embodiment 2

[0028] A method for treating ammonia nitrogen in acidic wastewater containing heavy metals, comprising the following steps:

[0029] 1) Use calcium zeolite and blast furnace steel slag to crush into 100-mesh slag powder at a ratio of 1:3 to make it easy to react, plasticize at 750°C, and then place it at 1750°C for 17.5 minutes. The mass ratio is 0.175:1 The proportion of water is put into water to undergo a hydrothermal reaction with water. The hydrothermal reaction is at a temperature of 425 ° C. The reaction time is more than 24 hours. After the hydrothermal reaction is completed, the reaction product is precipitated, filtered, dried, and crushed, and then weighed The ratio is 0.0006:1 into the waste water to remove heavy metals;

[0030] 2) Continue to add cationic polymer cationic polyacrylamide, which is suitable for flocculating organic matter in an acidic environment, to the wastewater to generate flocculated organic matter, place it in a flotation tank, and use air je...

Embodiment 3

[0035] A method for treating ammonia nitrogen in acidic wastewater containing heavy metals, comprising the following steps:

[0036] 1) Use the mixture of sodium zeolite and mordenite and blast furnace steel slag in a ratio of 1:4 to crush into 100-mesh slag powder to make it easy to react, plasticize at 800°C, and then place it at 2000°C for 20 minutes. The ratio of 0.3:1 is put into water and water to undergo a hydrothermal reaction. The hydrothermal reaction is at a temperature of 550°C. The reaction time is more than 24 hours. After the hydrothermal reaction is completed, the reaction product is precipitated, filtered, dried, Pulverized, then put into waste water at a ratio of 0.001:1 by weight to remove heavy metals;

[0037]2) Continue to add cationic polymer cationic polyacrylamide, which is suitable for flocculating organic matter in an acidic environment, to the wastewater to generate flocculated organic matter, place it in a flotation tank, and use air jet swirl floa...

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Abstract

The invention discloses a method for treating ammonia nitrogen in acid wastewater containing heavy metals, and belongs to the technical field of water treatment. The method comprises the following steps of: 1, after carrying out grinding and high-temperature plasticizing processing on zeolite and blast furnace steel slags, performing a hydrothermal reaction with water, carrying out sedimentation, filtration, drying and grinding on a reaction product, feeding the obtained product into the wastewater, and removing the heavy metals; 2, adding a cationic polymer into the wastewater to form a flocculation organism, removing toxic cyanide by an air jet cyclone floating device and a skimmer, and separating the flocculation organism; 3, leading the wastewater into a nitrification region to carry out nitrification; 4, after carrying out deoxidation on the wastewater, enabling the wastewater to enter an anaerobic denitrification to carry out denitrification; 5, filtering the wastewater by a submerged membrane to obtain filtered and purified water. According to the method disclosed by the invention, the heavy metals, the organism, the toxic cyanide and the ammonia nitrogen all can be effectively removed, and a sewage purification speed and biological purification intensity are improved; moreover, the method disclosed by the invention is low in construction investment, low in operation cost and suitable to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an ammonia nitrogen treatment method in acidic wastewater containing heavy metals. Background technique [0002] With the destruction of water environment caused by population and economic growth, the shortage of water resources is increasing day by day. Water treatment has attracted people's attention. [0003] On the one hand, excessive ammonia nitrogen content in water bodies is one of the main causes of eutrophication in rivers, lakes and other water bodies. The country has formulated strict control standards for the discharge of ammonia nitrogen. The first-level discharge standard for dyes, pharmaceutical raw materials, and petrochemical industries in the "Comprehensive Wastewater Discharge Standard" is 15 mg / L, and the second-level standard is 50 mg / L; "Urban Sewage Treatment Factory Pollutant Discharge Standard" is more stringent, the Class A standard is 5mg / L (wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F1/20C02F1/24C02F1/44C02F1/5236C02F1/56C02F1/66C02F3/02C02F3/28C02F9/00C02F2001/007C02F2101/16
Inventor 胡大苇
Owner 胡大苇
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