A method for cleaning and treating high ammonia nitrogen wastewater containing metal ions

A metal ion, cleaning treatment technology, applied in the field of high ammonia nitrogen wastewater cleaning and wastewater treatment, can solve the problems of ammonia gas escape, reduce the removal rate of metal cations and ammonia nitrogen, etc., and achieve the effect of high treatment efficiency

Active Publication Date: 2020-12-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high alkali conditions, metal cations tend to form stable complexes with ammonia nitrogen, thereby reducing the removal rate of metal cations and ammonia nitrogen.
In addition, the solution is in a state of high alkalinity. Although metal cations can be precipitated, ammonia nitrogen will be converted into free ammonia at high alkalinity, which is conducive to precipitation from the liquid phase and will cause a large amount of ammonia gas to escape.

Method used

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  • A method for cleaning and treating high ammonia nitrogen wastewater containing metal ions
  • A method for cleaning and treating high ammonia nitrogen wastewater containing metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The simulated wastewater is metal-containing high-concentration ammonia-nitrogen composite wastewater formulated with metal salts, sulfurous acid, sulfuric acid, and ammonium sulfate. The total iron in the wastewater is 120mg / L, the total aluminum is 80mg / L, the total calcium is 90mg / L, and the ammonia nitrogen is 15000mg. / L, pH=0.58.

[0072] 1) The simulated wastewater was prepared by 15% NaOH and 5% Na 2 CO 3 The mixed alkali of composition adjusts the pH of the solution to 8. At this time, it can be observed that a large amount of precipitation can be formed in the solution, and the concentration of free ammonia in the detection solution is C NH3 -1;

[0073] 2) Add one ten-thousandth of non-ionic polyacrylamide to the waste water, most of the metal precipitates can be flocculated and precipitated; then filter to obtain the filtrate and filter residue;

[0074] 3) The filtrate is transferred to a tubular mixer, and the pH of the solution is adjusted to 11 by sod...

Embodiment 2

[0077] The simulated wastewater is metal-containing high-concentration ammonia-nitrogen composite wastewater formulated with metal salts, sulfurous acid, sulfuric acid, and ammonium sulfate. The total iron in the wastewater is 120mg / L, the total lead is 100mg / L, the total aluminum is 80mg / L, and the total calcium is 90mg. / L, ammonia nitrogen is 15000mg / L, pH=0.58.

[0078] 1) The simulated wastewater is made of 15% KOH and 5% KHCO 3 The mixed alkali of composition adjusts the pH of the solution to 8. At this time, it can be observed that a large amount of precipitation can be formed in the solution, and the concentration of free ammonia in the detection solution is C NH3 -1;

[0079] 2) Add one ten-thousandth of non-ionic polyacrylamide to the waste water, most of the metal precipitates can be flocculated and precipitated; then filter to obtain the filtrate and filter residue;

[0080] 3) The filtrate is transferred to a tubular mixer, and potassium hydroxide solution is us...

Embodiment 3

[0083] Repeat Example 2, but also include:

[0084] 5) carry out metal recovery with the filter residue that step 2) obtains;

[0085] 6) The filtrate after the ammonia removal in step 4) is directly discharged or recycled. The ammonia obtained during the ammonia removal process is recovered.

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Abstract

A method for cleaning treatment of high-ammonia-nitrogen wastewater containing metal ions includes the following steps: 1) adding a mixed alkali into the wastewater, adjusting the pH of the wastewaterto be weak alkaline, and making metal ions form a precipitate; 2) adding a flocculant into the wastewater of the step 1), making the precipitate settled, and filtering, to obtain a filtrate and a filter residue; 3) transferring the filtrate into a tubular mixer, adding an alkaline solution, adjusting the pH of the filtrate in the tubular mixer to be strong alkaline; and 4) allowing the strong alkaline filtrate to pass through a fine filter system, and then transferring into a membrane absorption system, and removing ammonia. The invention provides the method for cleaning treatment of the high-ammonia-nitrogen wastewater containing the metal ions. The method has the advantages of clean treatment, simple operation and high treatment efficiency.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for cleaning and treating high ammonia nitrogen wastewater containing metal ions; it belongs to the field of resource and environment protection. Background technique [0002] Ammonia nitrogen is one of the main pollutants in water bodies. The main harm of ammonia nitrogen to the environment is to cause eutrophication such as red tides and algal blooms, which seriously threaten ecological security. For the removal of ammonia nitrogen in wastewater, the common chemical precipitation method, stripping method, chemical oxidation method, biological method, membrane separation method, ion exchange method, etc. Because the membrane separation method has the advantages of low corrosion to equipment, high removal rate, and simple equipment, it is widely used. [0003] A large amount of wastewater containing metal ions, such as iron, copper, lead, zinc, cadmium, cobalt, nickel, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/16
CPCC02F1/001C02F1/44C02F1/5236C02F9/00C02F2101/16C02F2301/08
Inventor 杨本涛魏进超肖海娟刘义陈瑶李俊杰康建刚
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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