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
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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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