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Recycling treatment method for reducing the content of ammonia nitrogen, calcium and magnesium ions in manganese-containing wastewater

A treatment method, magnesium ion technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Achieve the effect of reducing solubility, low equipment requirements and simple process

Active Publication Date: 2022-01-25
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is cumbersome, and the multi-set membrane equipment occupies a large area; during the operation, pollutants will also be adsorbed and deposited on the membrane surface or in the membrane pores to cause membrane pollution. Therefore, it is necessary to regularly clean and replace the contaminated membrane components, and the operating cost higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 200mL of manganese-containing wastewater, use Nessler's reagent spectrophotometry to measure the content of ammonia nitrogen as 1000-1500mg / L, use flame atomic absorption spectrometry to measure the content of manganese ions as 2000-3000mg / L, and the content of calcium ions as 350-400mg / L L, the magnesium ion content is 1000-1500mg / L.

[0031] The manganese-containing wastewater with a temperature of 35°C was adjusted to 10.5 with 10mol / L lime water; under stirring conditions, slowly added 2.4g Mn(H 2 PO 4 ) 2 2H 2 O (equivalent to 100% of the theoretical amount needed to generate struvite precipitation), continue to stir for 10min; after standing for 1h, filter the manganese-containing waste water with qualitative filter paper to obtain the first filtrate; wash and dry the gained precipitation to obtain Precipitation of struvite; add 0.08 g MnSO to the first filtrate 4 (equivalent to MnSO in manganese-containing wastewater 4 5% of the mass percentage composit...

Embodiment 2

[0033] Take 1L of manganese-containing wastewater, use Nessler's reagent spectrophotometry to measure the ammonia content as 2000-3000mg / L, use flame atomic absorption spectrometry to measure the manganese ion content as 2000-3000mg / L, and the calcium ion content as 400-450mg / L L, the magnesium ion content is 1500-2000mg / L.

[0034] The manganese-containing wastewater with a temperature of 95°C was adjusted to a pH value of 9.0 with 5mol / L lime water; under stirring conditions, slowly added 24g Mn(H 2 PO 4 ) 2 2H 2 O (equivalent to 150% of the theoretical amount needed to generate struvite precipitation), continue to stir for 1h; after standing for 24h, filter the manganese-containing waste water with qualitative filter paper to obtain the first filtrate; wash and dry the gained precipitation to obtain Struvite precipitated; 1.6 g MnSO was added to the first filtrate 4 (equivalent to MnSO in manganese-containing wastewater 4 20% of the mass percentage composition), stirre...

Embodiment 3

[0036] Take 50L of manganese-containing wastewater, use Nessler's reagent spectrophotometry to measure the content of ammonia nitrogen as 2000-2500mg / L, use flame atomic absorption spectrometry to measure the content of manganese ions as 2000-2500mg / L, and the content of calcium ions as 300-400mg / L L, the magnesium ion content is 1000-2000mg / L.

[0037] Add slaked lime to manganese-containing wastewater at a temperature of 65°C, stir evenly, and adjust its pH value to 9.5; then slowly add 0.96kg Mn(H 2 PO 4 ) 2 2H 2 O (being equivalent to generating 120% of the required theoretical dosage of struvite precipitation), stirred for 45min, left standstill 18h, filtered to obtain struvite slow-release fertilizer; to filtrate, add 34.3g MnSO 4 (equivalent to MnSO in manganese-containing wastewater 4 10% of the mass percent content), stirred for 60min, stood for 18h, and precipitated CaSO 4 Precipitate and filter; pass the filtrate through a filter column equipped with zeolite at...

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Abstract

The invention discloses a resource treatment method for reducing the content of ammonia nitrogen, calcium and magnesium ions in manganese-containing wastewater, which comprises the following steps: firstly adding Mn(H 2 PO 4 ) 2 2H 2 O, using H 2 PO 4 ‑ HPO 4 2‑ and PO 4 3‑ , and NH in manganese-containing wastewater 4+ , Mg 2+ Generate magnesium ammonium phosphate precipitate; Mn(H 2 PO 4 ) 2 2H 2 Mn in O 2+ Can increase MnSO in manganese-containing wastewater 4 concentration, thereby increasing the CaSO 4 Repulsion, reduce its solubility; then add MnSO 4 , promoting CaSO 4 The formation of precipitates makes Ca 2+ CaSO 4 The form is precipitated; finally, the manganese-containing wastewater is passed through the adsorbent, and the remaining NH 4+ Adsorption collection. The invention realizes resource recovery of manganese, ammonia nitrogen and magnesium in manganese-containing wastewater.

Description

technical field [0001] The invention relates to the technical field of manganese-containing wastewater treatment, in particular to a resource treatment method for reducing the contents of ammonia nitrogen, calcium and magnesium ions in manganese-containing wastewater. Background technique [0002] Manganese has an important strategic position in my country and is widely used in iron and steel production, non-ferrous metal alloys, aerospace, electronic technology and environmental protection and other fields. According to statistics, my country's annual mining of manganese ore exceeds 10 million tons, ranking first in the world. A large amount of manganese-containing wastewater is produced in the process of mining and deep processing. This type of wastewater has complex water quality and contains a large amount of sulfate, ammonia nitrogen, manganese and other heavy metal ions. , if discharged directly, it will cause serious environmental pollution. At the same time, the aver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C05B17/00C01B25/45C02F101/16C02F101/20
Inventor 赵瑾曹军瑞邱金泉马宇辉寇希元王勋亮
Owner 自然资源部天津海水淡化与综合利用研究所
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