Method for processing phosphorus in sediment by combining photocatalytic reduction with submerged plants

A submerged plant, combined treatment technology, applied in chemical instruments and methods, light water/sewage treatment, water/sewage treatment and other directions, can solve the problem of no phosphorus and other problems, achieve low cost, solve difficult removal, and solve phosphorus stress Effect

Active Publication Date: 2012-01-25
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no research report on the use of photocatalysts to degrade phosphorus in sediments.

Method used

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  • Method for processing phosphorus in sediment by combining photocatalytic reduction with submerged plants
  • Method for processing phosphorus in sediment by combining photocatalytic reduction with submerged plants
  • Method for processing phosphorus in sediment by combining photocatalytic reduction with submerged plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A method for photocatalytic reduction and submerged plant combined treatment of phosphorus in sediments, the steps are:

[0063] 1) The sediment was collected from a shallow lake in Wuhan, Hubei, and the phosphorus content of each form is shown in Table 1.

[0064] 2) The submerged plants were selected as Potamogeton crispus and Elodea nuttallii.

[0065] 3) Plant Potamogeton crispus and Elodea (quantity ratio 1:1) in a glass tank (50cmx50cmx80cm) containing sediments, the depth of which is 10cm, and a layer of nano-semiconductor photocatalyst film loaded on the sediments The magnesium slag ceramic filter ball is 2cm thick.

[0066] 4) Inject the overlying water, which is collected from the water column at the sediment sampling point, with a water depth of 60cm.

[0067] 5) Intermittent irradiation with an external light source (high-pressure mercury lamp) during the initial growth and decline period of submerged plants (irradiated for 4 hours during the day and 2 hours at night...

Embodiment 2

[0074] It is basically the same as Example 1, except that: the sediment was collected from a shallow lake in Wuhan, Hubei, and the phosphorus content of each form is shown in Table 2. The submerged plants are Potamogeton crispus and goldfish Algae (Ceratophyllum demersum L.); The nano semiconductor photocatalyst is a sulfide semiconductor (such as cadmium sulfide, etc.).

[0075] In this embodiment, after the submerged plants have grown for 180 days, the total phosphorus removal rate of the sediment can reach over 80%.

[0076] Table 2 Phosphorus content of various forms in sediments (mg / kg)

[0077]

Embodiment 3

[0079] It is basically the same as Example 1, except that: the sediment was collected from a freshwater lake in the middle and lower reaches of the Yangtze River, and the phosphorus content of each form is shown in Table 3; the submerged plants are Vallisneria spiralis and Vallisneria spiralis. Ceratophyllum demersum L.; the nano-semiconductor photocatalyst is a modified oxide semiconductor (such as modified titanium dioxide); the light source is a 250W high-pressure sodium lamp.

[0080] In this embodiment, after the submerged plants grow for 180 days, the total phosphorus removal rate of the sediment can reach more than 90%.

[0081] Table 3 Phosphorus content of various forms in sediments (mg / kg)

[0082]

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Abstract

The invention discloses a method for processing phosphorus in sediment by combining photocatalytic reduction with submerged plants. The method comprises the following steps: 1) screening out the submerged plants adapted to local climate and water area conditions; 2) planting the submerged plants into a glass ware containing the sediment and laying a layer of novel environment-friendly filter balls loaded with a nano-semiconductor photocatalyst thin film on the sediment; 3) injecting overlying water which is from a water column at a sediment sampling point; 4) performing intermittent irradiation by using an external light source at the growth initial stage and the decline stage of the submerged plants, wherein the external light source not only enables a photocatalyst to perform photocatalytic reaction, but also meets the light irradiation required for the growth of the submerged plants; and 5) collecting sediment samples at set time intervals and determining the change situation of the phosphorus in all forms in the sediment. The method is easy to operate and simple and convenient to operate; by adopting the method, the phosphorus in the sediment in an eutrophic water body can be removed with high efficiency and the phosphorus stress problem during the process of restoration and reconstruction of the submerged plants can also be effectively solved.

Description

Technical field [0001] The invention relates to a method for combined treatment of sediment phosphorus, in particular to a method for combined treatment of sediment phosphorus by photocatalytic reduction and submerged plants. It can be widely used to treat phosphorus in rivers and lakes. Background technique [0002] Eutrophication of water bodies is a serious environmental problem facing the world today. Phosphorus is one of the key factors affecting the enrichment process of freshwater bodies. With my country’s increasing efforts to control pollution emissions and water restoration management, the input of external phosphorus will gradually be controlled, and secondary pollution caused by the release of internal phosphorus will become an important source of eutrophication of water bodies. For the control of the lake's endogenous load of sediment phosphorus, currently there are mainly methods such as sediment dredging, water diversion and cleanup, deep water discharge, physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/32C02F1/30C02F1/58
Inventor 吴振斌贺锋张义夏世斌周巧红徐栋
Owner INST OF AQUATIC LIFE ACAD SINICA
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