Treatment technique of manganese-containing wastewater in wet electrolytic manganese production process

A production process and treatment process technology, applied in the field of manganese-containing wastewater treatment process, can solve the problems of complex water quality, difficult operation and use, etc., achieve the effect of no secondary pollution, realize circular economy, and eliminate environmental damage

Inactive Publication Date: 2014-12-03
上海三夫工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its technical plan did not notice that the water quality of the manganese-containing comprehensive wastewater and the leachate of the slag field is very complicated. In addition to a large amount of manganese ions, ammonium ions, and sulfate ions, the wastewater also contains calcium ions, magnesium ions, electrolytic process or equipment floor Flushing will also bring out grease organic matter, and humic acid organic matter in the leachate of the slag field. If passivation with chromium is used, a certain amount of hexavalent chromium ions will also be contained in the manganese-containing wastewater.
In the manganese-containing wastewater system containing sulfate, the presence of calcium and magnesium ions will cause scale and membrane plugging risks for nanofiltration a

Method used

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  • Treatment technique of manganese-containing wastewater in wet electrolytic manganese production process
  • Treatment technique of manganese-containing wastewater in wet electrolytic manganese production process
  • Treatment technique of manganese-containing wastewater in wet electrolytic manganese production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The ammonium- and manganese-containing waste water in the electrolytic manganese production process is taken as the raw water to be treated. The quality of the raw water is shown in Table 1. The system process is as follows: figure 1 shown.

[0081] Table 1

[0082] project

unit

value

pH

4～5

NH 4 +

mg / L

1400

mn 2+

mg / L

1500

Ca 2+

mg / L

650

Cr 6+

mg / L

4.5

TDS

mg / L

14000

oil

mg / L

0.5

SS

mg / L

65

[0083] project

unit

value

TOC

mg / L

＜15

[0084] The raw water of wastewater enters the equalization tank first, and the water quality and quantity are balanced, and the wastewater flow rate is controlled to 100m 3 / h, residence time 8h.

[0085] Use the lift pump to transport the effluent from the homogenization tank to the decalcification tank, add decalcifier oxalic acid, let the calc...

Embodiment 2

[0097] The specifications of raw water to be treated are shown in Table 3, and the process flow is as follows figure 2 Shown, main steps are the same as embodiment 1, just reduced decalcification step. In addition, the RO concentrate is recycled to the electrolysis production process.

[0098] table 3

[0099] project

unit

value

pH

6.5

NH 4 +

mg / L

1900

mn 2+

mg / L

1800

Ca 2+

mg / L

150

Cr 6+

mg / L

1.5

TDS

mg / L

18000

oil

mg / L

0.5

SS

mg / L

80

TOC

mg / L

＜15

[0100] The raw water of wastewater enters the equalization tank first, and the water quality and quantity are balanced, and the wastewater flow rate is controlled to 100m 3 / h, residence time 8h.

[0101] Pump the effluent from the equalization tank into the reduction tank, add sulfuric acid to adjust the pH of the wastewater to 4, then add the reducing agent ...

Embodiment 3

[0112] The specifications of raw water are shown in Table 5, and the process flow is as follows image 3 As shown, the main steps are the same as in Example 1, and the reduction steps are reduced because the water body does not contain chromium.

[0113] table 5

[0114] project

unit

value

pH

6.5

NH 4 +

mg / L

1700

mn 2+

mg / L

1900

Ca 2+

mg / L

450

TDS

mg / L

17000

oil

mg / L

0.3

SS

mg / L

65

TOC

mg / l

＜15

[0115] The raw waste water first enters the equalization tank to balance the water quality and quantity, and control the waste water flow to 50m 3 / h, residence time 8h.

[0116] Use a lift pump to transport the effluent from the homogenization tank to the decalcification tank, add decalcifier oxalic acid, let the calcium ions in the wastewater react with oxalic acid to form calcium oxalate solids, and keep the calcium ion concent...

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PUM

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Abstract

The invention relates to a treatment technique of manganese-containing wastewater in a wet electrolytic manganese production process, which comprises the following steps: mixing, calcium removal, reduction, neutralization, floatation, ultrafiltration membrane filtration, reverse osmosis membrane filtration and the like. The technique overcomes the defects in manganese-containing wastewater treatment in the prior art, has the advantages of advanced and reliable technique, high tolerance to wastewater quality fluctuation and stable effluent water quality, recovers ammonium, manganese and other valuable substances, and implements sustainable development of the environment and cyclic utilization of resources.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment process for manganese-containing waste water in the wet electrolytic manganese production process. Background technique [0002] In recent years, my country has gradually developed into the world's largest producer, exporter and consumer of electrolytic manganese. During the production process of wet electrolytic manganese, a large amount of waste water from plate washing, tank cleaning and diaphragm cloth cleaning, plate washing waste water from electrolysis workshop, ground washing water, washing water from filter press workshop, filter cloth washing waste water, leachate from slag storage, etc. will be produced in large quantities. Wastewater, where Mn 2+ The concentration is 700~2000mg / L, NH 4 + The concentration is 500~2300mg / L, Ca 2+ Concentration 100~700mg / L, Cr 6+ The concentration is 0-10mg / L, and the SS concentration is 20-100mg / L. These wastewater...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/02C02F9/10
Inventor 张国兴刘景霞李俊殷继园傅立德
Owner 上海三夫工程技术有限公司
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