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REMEDIATION AND/OR RESTORATION Of ANOXIC BODY OF WATER

A water body and water layer technology, applied in the field of calcium nitrate [Ca2] solution, can solve problems such as labor and loss of calcium nitrate solution

Active Publication Date: 2018-10-23
YARA INT ASA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0029] The disadvantages of Limnox are that it is challenging to apply in the sediment, which also contacts all the animals and plants in the layer; it is laborious to apply the calcium nitrate solution evenly in a precise manner; and it is due to the diluting of the nitric acid due to the currents in the lake Saline solution layer and transports nitrate to higher water body layers, so calcium nitrate aqueous solution will lose some

Method used

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  • REMEDIATION AND/OR RESTORATION Of ANOXIC BODY OF WATER
  • REMEDIATION AND/OR RESTORATION Of ANOXIC BODY OF WATER
  • REMEDIATION AND/OR RESTORATION Of ANOXIC BODY OF WATER

Examples

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example 1

[0148] In 2013-2014, the partial dredging of Lake Schafels in Berlin-Leinigendorf covered the lakeside area to a depth of 3.5 m. The lake has a maximum depth of 6-7 meters. The total area of ​​the lake is 4.14 hectares. The area to be dredged occupies a portion of approximately 1.55 hectares. Therefore, if figure 1 As can be seen in , a large part of the 2.6-hectare lake (corresponding to about 63% of the total area) was not covered by the dredging process during the restoration works. Regarding this undredged area, it involves a stratosphere with a volume of about 50,000m3 and slightly less than 170,000m 3 1 / 3 of the total volume. Before the recovery, a water study carried out in July 2013 by Büro Wassmann from Borgsdorf showed a marked lack of oxygen in the deep waters (hemosphere). Relevant decay processes in the form of hydrogen sulfide products were confirmed by negative redox potentials. Furthermore, the reducing environment promotes the redissolution of nutrients ...

example 2

[0163] This example shows how the required CN concentration can be calculated, focusing on different parameters depending on the water flow rate, injection time period, etc., such as the variability of stock solutions, first dilutions, etc. There are various possible values ​​for the starting concentration and the dilution, depending on the sum of different parameters, resulting in the final concentration of the water body (here Lake Schafels). Optimization and therefore measurement is required because the conditions for microbial processes will be different in each water body. It is also necessary to detect the appropriate injection time and measure the temperature, oxygen and redox potential in the depth profile. The appropriate injection time for stratified lakes is stable stratification, which begins with anoxic and, for shallow lakes, negative redox potential / anoxic. In addition, when it is different from the first calculation result, the control of nitrate and oxygen ne...

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Abstract

The application relates to a method for remediation and / or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and the methodcomprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and / or restored anoxic body of water (10) is between 1 and 20mg / l. The application furthermore relates to a system (1) for remediation and / or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein themeans to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

Description

technical field [0001] This application relates to the use of calcium nitrate [Ca(NO 3 ) 2 ] The technical field of the solution. Anoxic water bodies are generally defined as "areas of seawater, freshwater, or groundwater that are depleted of dissolved oxygen and present in a relatively severe anoxic state (hypoxic state)". The US Geological Survey defines anoxic water as a body of water with a dissolved oxygen concentration of less than 0.5 milligrams per liter. [0002] Anoxic water bodies according to the present application include calm water bodies and thermostratified water bodies, such as the bottom of thermostratified rivers, ponds, lakes and the like. A particular anoxic body of water contemplated in this application is water contained in a layer of silt or sediment at the bottom of a body of water, which may or may not be thermostratified. A pond is generally "a natural or artificial body of still water, usually smaller than a lake". Thermal stratification of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02B09C1/00C02F3/30C02F7/00
CPCB09C1/002B09C1/08C02F3/025C02F3/305C02F7/00C02F2103/007C02F2305/06C02F1/68Y02W10/37C02F1/686C02F3/26Y02W10/10
Inventor H·瓦斯曼R·克莱姆
Owner YARA INT ASA
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