In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud

A technology of polluted bottom mud and remediation methods, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., to achieve good landscape effects, maintain overall integrity, and restore benthic habitats

Active Publication Date: 2015-09-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing sediment covering and repairing technology, provide a durable and stable in-situ repair of heavy metal and / or nitrogen and phosphorus polluted sediment, and facilitate the reconstruction and repair of benthic water bodies Habitat coverage method

Method used

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  • In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud
  • In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud
  • In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 Preparation of Active Porous Ecological Concrete

[0038] 1. Raw materials: commercially available zeolite, Portland cement, polycarboxylate superplasticizer, and water.

[0039] 2. Raw material treatment: crush, sieve, and clean zeolite, select zeolite with a particle size of 5-10 mm, design with a target porosity > 25%, and use a mass ratio of zeolite: cement: water = 5.32: 1: 0.25 ratio, plus a polycarboxylate superplasticizer accounting for 0.8% of the cement dosage.

[0040] 3. Preparation: Add 1 / 4 of the total water consumption to the zeolite (pre-mixed water), stir for 1-2 minutes to make the surface of the zeolite wet, then add cement and water reducer, and stir for about 1-2 minutes to make the surface of the zeolite uniform Wrap a layer of cement slurry shell, then add the remaining mixing water and continue stirring for about 2-3 minutes until completely mixed.

[0041] The active porous ecological concrete mixture prepared above is directly p...

Embodiment 2

[0042] Example 2 Preparation of Active Porous Ecological Concrete

[0043] 1. Raw materials: commercially available zeolite, Portland cement, polycarboxylate superplasticizer, and water.

[0044] 2. Raw material treatment: crush, sieve, and clean zeolite, select zeolite with a particle size of 5-10 mm, design with a target porosity > 25%, and use a mass ratio of zeolite: cement: water = 4.02: 1: 0.25 Proportion, plus 0.5% of the cement dosage of polycarboxylate superplasticizer.

[0045] 3. Preparation: Add 1 / 4 of the total water consumption to the zeolite (pre-mixed water), stir for 1-2 minutes to make the surface of the zeolite wet, then add cement and water reducer, and stir for about 1-2 minutes to make the surface of the zeolite uniform Wrap a layer of cement slurry shell, then add the remaining mixing water and continue stirring for about 2-3 minutes until completely mixed.

[0046] The active porous ecological concrete mixture prepared above is directly poured on th...

Embodiment 3

[0047] Example 3 Preparation of Active Porous Ecological Concrete

[0048] 1. Raw materials: commercially available zeolite, Portland cement, polycarboxylate superplasticizer, and water.

[0049] 2. Raw material treatment: crush, sieve, and clean zeolite, select zeolite with a particle size of 5-10 mm, design with a target porosity > 25%, and use a mass ratio of zeolite: cement: water = 5.69: 1: 0.30 Proportion, plus a polycarboxylate superplasticizer that accounts for 1% of the cement dosage.

[0050] 3. Preparation: Add 1 / 4 of the total water consumption to the zeolite (pre-mixed water), stir for 1-2 minutes to make the surface of the zeolite wet, then add cement and water reducer, and stir for about 1-2 minutes to make the surface of the zeolite uniform Wrap a layer of cement slurry shell, then add the remaining mixing water and continue stirring for about 2-3 minutes until completely mixed.

[0051] The active porous ecological concrete mixture prepared above is direct...

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Abstract

The invention discloses an in-situ continuous remediation method for heavy metals and / or nitrogen and phosphorus polluted bottom mud. The method comprises the following steps of forming a porous ecological concrete covering layer on a bottom mud-water interface by using an active porous ecological concrete covering material, and planting submerged plants on the covering layer, so that the in-situ continuous remediation of heavy metals and / or nitrogen and phosphorus polluted bottom mud and the reconstruction and repair of a benthonic realm are implemented. The active porous ecological concrete covering material comprises the following components in parts by weight: active coarse aggregate, cement and water, the ratio of the active coarse aggregate, the cement and the water is (4.02-5.69):1:(0.25-0.30), and the active coarse aggregate is zeolite, pelelith or activated carbon. According to the method, under the synergic action of the active covering layer and the submerged plants, the endogenesis release of heavy metals, nitrogen and phosphorus can be permanently, stably and effectively controlled; and the active covering layer can ensure the overall structure integrity of the bottom mud covering layer better, so that a good habitat is provided for benthos, thereby facilitating the recovery and reconstruction of benthonic realms in the later period of water remediation.

Description

technical field [0001] The invention belongs to the technical field of restoration of surface water body polluted bottom mud. More specifically, it relates to an in-situ continuous repair method for heavy metal and / or nitrogen and phosphorus contaminated sediment. Background technique [0002] In the initial stage of surface water environmental protection, people are mostly committed to cutting off or controlling the impact of external pollution sources in order to reduce the total amount of pollutants entering the water body in quantity. However, after the external source pollution that affects water quality has been effectively controlled, the water quality has not improved significantly as expected, and some pollution conditions have even worsened. Subsequent studies have found that the sediment, which has long been considered as the “reservoir” of reservoir pollutants, also acts as a “source” under certain conditions. When conditions change, pollutants such as nitroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F101/20
Inventor 杨扬李星王铭唐小燕乔永民
Owner JINAN UNIVERSITY
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