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Method for in-situ control of hydrogen sulfide odor in sediments

A sediment and hydrogen sulfide technology, which is applied in the oxidation treatment of sludge, waterway systems, sewer pipeline systems, etc., can solve the problems of large amount of engineering, expensive pipeline dredging, inapplicability of interception and sewage law enforcement, etc., and achieves low cost. Effect

Active Publication Date: 2017-03-15
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, frequent pipeline dredging is costly and extensive, and interception and sewage enforcement is not applicable in many cities

Method used

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  • Method for in-situ control of hydrogen sulfide odor in sediments
  • Method for in-situ control of hydrogen sulfide odor in sediments
  • Method for in-situ control of hydrogen sulfide odor in sediments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add granular iron hydroxide (GFH) to the water containing hydrogen sulfide, so that the molar ratio of iron and hydrogen sulfide in the water is greater than 1:1, and then fully mix the mixed solution for 1 to 24 hours to complete the hydrogen sulfide removal. The water used is the water sample containing hydrogen sulfide prepared in the laboratory. At room temperature (22±1°C), NaHCO 3 , HCl and NaOH to adjust the pH to 7.1, then add GFH to the water containing hydrogen sulfide, so that the ratio of hydrogen sulfide to hydrogen sulfide is 2:1 and 8:1 respectively, and the reactor is a 43mL airtight plastic bottle. The reactor was placed on a shaker and mixed thoroughly (200rpm), and samples were taken at regular intervals to observe the removal effect of hydrogen sulfide.

[0046] Figure 4 It is a figure showing the removal effect of hydrogen sulfide in this embodiment. As shown in the figure, the removal of hydrogen sulfide with GFH is effective and feasible, and ...

Embodiment 2

[0048] Add granular iron oxide, iron hydroxide, zero-valent iron or iron slag to the sediment of rainwater pipes, rivers or sewage pipes, and mix evenly to achieve complete removal of hydrogen sulfide. When the effect of granular iron in controlling hydrogen sulfide declines, set a gate at the connection between the rainwater pipe and the seawater inlet and close the gate, so that the seawater high tide level reaches a certain water level (1.0-2.6m), and then open the gate to enrich the oxygen The seawater forms a turbulent flow, fully contacts with the sediment and the invalid granular iron, and the regenerated iron particles co-precipitate with the sediment. The above regeneration process can be repeated several times as required until the desired regeneration effect is achieved.

[0049] Figure 5It is a figure showing the removal effect of hydrogen sulfide in the present embodiment, showing the effect of using GFH to control the generation of hydrogen sulfide from deposit...

Embodiment 3

[0052] Mix GFH evenly into the artificial bottom mud (clean quartz sand with a particle size of 0.5-1.0 mm), so that the concentration of GFH in the bottom mud is 2.18 grams per liter of sediment, and then fill the mixture into a columnar reactor, and continuously The GFH is deactivated by passing an aqueous solution containing hydrogen sulfide, so that the hydrogen sulfide removal capacity of the GFH can be calculated based on the total amount of hydrogen sulfide removed. Sediment containing failed GFH was spread flat in a small storm sewer simulator (e.g. Figure 6 As shown, the slope is 1:20, the width is 0.3m), and the thickness of the bottom mud layer is about 10mm. The end of the rainwater pipe is connected to a reservoir filled with water. Gates, by opening the gates quickly to create the hydraulic flushing effect mentioned above, allowing the oxygen-enriched water to mix well with the sediment. Since the volume of the cistern is about 18 times that of the rainwater pi...

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Abstract

The invention provides a method for in-situ control of hydrogen sulfide odor in sediments. The sediments are allowed to contact with indissolvable or insoluble particle oxidizing agents to remove hydrogen sulfide in the sediments through an in-situ oxidation and reduction process, and the oxidizing agent is recycled by in-situ regeneration. The method is further used for control of hydrogen sulfide odor of the sediments in rainwater pipelines, rivers or sewage pipelines.

Description

technical field [0001] The present invention relates to a method for in situ control of hydrogen sulfide odor in sediments using a particulate oxidant. More specifically, the present invention relates to methods for in situ control of hydrogen sulfide odor in sediments using particulate iron oxides and / or iron hydroxides. Background technique [0002] The problem of odor in drain pipes has always been a serious public problem. During urban rainfall periods, rainwater flows directly into the sea or rivers through storm sewers. Due to topography and other reasons, some rainwater pipes are designed with a small slope, so the water flow velocity is very slow, causing some particulate matter to deposit at the bottom of the pipe to form sediment and sediment. The sediment contains dust, particles and organic matter adsorbed on the particulate matter brought by the rainwater scouring the surface, and the domestic sewage discharged from some misconnected sewers also flows into the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06E03F3/00
Inventor 商啟古斯塔夫·艾德里安·金克特孙建良方晶云
Owner THE HONG KONG UNIV OF SCI & TECH
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