Method for cleaning treatment of high-ammonia-nitrogen wastewater containing metal ions

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

Active Publication Date: 2018-05-08
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 alkalini

Method used

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  • Method for cleaning treatment of high-ammonia-nitrogen wastewater containing metal ions
  • Method for cleaning treatment of high-ammonia-nitrogen wastewater containing metal ions

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0070] Example 1

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

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

[0073] 2) Add one ten thousandth of non-ionic polyacrylamide to the wastewater, most of the metal precipitation can undergo flocculation precipitation; then filter to obtain filtrate and filter residue;

[0074] 3) Transfer the filtrate to a tubular mixer, adjust the pH of the solution to 11 with sodium hydroxide solution, and observe whether the...

Example Embodiment

[0076] Example 2:

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

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

[0079] 2) Add one ten thousandth of non-ionic polyacrylamide to the wastewater, most of the metal precipitation can undergo flocculation precipitation; then filter to obtain filtrate and filter residue;

[0080] 3) Transfer the filtrate to a tubular mixer, adjust the pH of the solution to 11 with potassium hydroxide solution, and observ...

Example Embodiment

[0082] Example 3

[0083] Repeat Example 2, but also include:

[0084] 5) Perform metal recovery on the filter residue obtained in step 2);

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