Vertical flow constructed wetland used for treating paint wastewater containing lead and cadmium and preparation method thereof

A paint wastewater and artificial wetland technology, applied in waste paint treatment, sustainable biological treatment, chemical instruments and methods, etc., to achieve the effects of avoiding changes in water load, saving costs, and saving floor space

Active Publication Date: 2012-07-25
GANSU GOLDEN BRIDGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem to be solved by the present invention is to select an excellent constructed wetland matrix and provide a new type of constructed wetland treatment technology for sewage purification with good treatment effect, stable operation, high efficiency, low energy consumption, and low maintenance and management costs

Method used

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  • Vertical flow constructed wetland used for treating paint wastewater containing lead and cadmium and preparation method thereof
  • Vertical flow constructed wetland used for treating paint wastewater containing lead and cadmium and preparation method thereof
  • Vertical flow constructed wetland used for treating paint wastewater containing lead and cadmium and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: a kind of vertical flow artificial wetland that is used to process lead, cadmium paint waste water and phosphorous waste water, it is characterized in that comprising the following wetland matrix material by weight ratio:

[0035] Soil, 150 ~ 250 parts by weight;

[0036] Fine sand with a particle size of 0.15-0.25 mm, 200-300 parts by weight;

[0037] Gravel with a particle size of 20-40 mm, 200-350 parts by weight;

[0038] 100-200 parts by weight of fine coal slag with a particle size of 2-10 mm;

[0039] Sludge, 100-150 parts by weight.

[0040] Under the conditions of continuous water inflow concentration of 200~600mg / L and continuous water inflow time of 24 hours, the substrate can remove more than 60% of phosphorus in the water body.

[0041] Under the condition that the influent Pb concentration is 10~160mg / L, the influent Cd concentration is 5~50mg / L, and the continuous water inflow time is 24 hours, the removal rate of heavy metal ions in the ...

Embodiment 2

[0042] Embodiment 2: Same as Embodiment 1, except that: the following wetland matrix material in proportion by weight is also included: fly ash (average particle size: 10-20 μm): 130-180 parts by weight.

[0043] Under the conditions of continuous water inflow concentration of 200~600mg / L and continuous water inflow time of 24 hours, the substrate can remove more than 70% of phosphorus in the water body.

[0044] Under the condition that the influent Pb concentration is 10~160mg / L, the influent Cd concentration is 5~50mg / L, and the continuous water inflow time is 24 hours, the removal rate of heavy metal ions in the water body by the matrix can reach more than 90%.

Embodiment 3～9

[0045] Embodiments 3 to 9: the same as Embodiment 1, the difference is that: the wetland matrix material is composed of the following materials in proportion by weight:

[0046] Table 1 Ratio of wetland matrix materials

[0047]

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Abstract

The invention mainly relates to a technology for purifying certain heavy metal pollutants in sewage and removing phosphorus by mixed constructed wetland substrates. According to the invention, raw material preparation components, structures, volumes and mass ratio of the constructed wetland substrates are determined, removing effects of wastewater pollutants in different preparation modes are tested and analyzed, and an optimized preparation method is provided. The invention has a guiding significance for the construction and operation of the constructed wetland for treating the wastewater containing heavy metals and wastewater containing phosphorus.

Description

technical field [0001] The invention mainly relates to a sewage treatment technology, in particular to a technology for purifying certain heavy metal pollutants in sewage by using a combined artificial wetland matrix. Background technique [0002] The application of constructed wetland sewage treatment systems in foreign countries began in the early 1970s. At present, there are more than 300 constructed wetland sewage treatment systems in the United States and Canada, and more than 500 in Europe, with a scale as small as 40m 2 , as large as more than 1,000 hectares. The North American Database (NADB) is an important database reflecting the decontamination capacity of wetlands established through the investigation and research of more than 100 wastewater treatment wetlands abroad. The database shows that the removal rate of wetland to BOD and COD can reach 80-90%. For the removal rate of nitrogen and phosphorus, the data shows that the value is slightly lower than 60% and 9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/20C02F103/14
CPCY02W10/10
Inventor REN JUNWANG GANGTAO LINGZOU ZHIHUA
Owner GANSU GOLDEN BRIDGE GRP CO LTD
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