Purifying method for black and odorous water and sediment nutrient salt

A black and odorous water and nutrient salt technology, applied in the field of environmental governance, can solve the problems of insufficient improvement of oxidation-reduction conditions at the surface mud-water interface, weaken the effect of chemical agents, and fail to form medium and long-term effects, so as to improve oxidation-reduction conditions and increase transparency , Promote the effect of endogenous phosphorus solidification

Inactive Publication Date: 2013-01-16
NANTONG UNIVERSITY +1
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Problems solved by technology

There are certain defects in the above method: it is not effective in synchronously purifying the nitrogen and phosphorus pollution of the water body and the surface sediment; the amount of chemical agents used is large, and it is not easy to mix with the surface sediment, which weakens the use effect of the chemical agents and increases the use of chemical agents. Cost; insufficient improvement of redox conditions at the surface mud-water interface, unable to form medium and long-term effects

Method used

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  • Purifying method for black and odorous water and sediment nutrient salt

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Experimental program
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Effect test

Embodiment 1

[0038] Using a circular plexiglass container (d=10cm, h=60cm) as the sampling and experimental device, the in-situ sediment (15cm) and overlying water (30cm, about 2.5L) of a black and odorous river in a certain city were collected in situ as experimental materials.

[0039] Place the microporous aeration head (the air bubble size is 1-3 mm) on the PVC support, and insert it 2 cm below the top of the sediment. After standing for a few days, use an aerator to aerate, and cover the water COD cr The average concentration was 91.87mg / L, the aeration parameters were 1L / min, 6h / d, the aeration was stopped on the 16th day, and then stood for 3 weeks for observation, and the experiment ended on the 37th day.

[0040] After 16 days, compared with before the experiment, the overlying water NH4 + -N, PO4 - -P was reduced by 99.43% and 99.81%, respectively, among which, PO4 - -P removal rate reached 99.12% after 1 day of aeration; NH4 after standing for 3 weeks + -N and PO4 - The fin...

Embodiment 2

[0044] Using a PVC bucket (d top = 50cm, d bottom = 45cm, h = 70cm) as the experimental device, add 100L of bottom mud (typical black and odorous river), about 15cm high, and then siphon into the overlying water 360L (collected at the same time as the bottom mud) About 50cm high.

[0045] With the center of the bottom of the barrel as the center, aeration devices are arranged on concentric circles with a radius of 10cm and 20cm respectively. An aeration head is arranged at every 1 / 4 arc of the inner circle, and an aeration head is arranged at every 1 / 8 arc of the outer circle. Air head, plus 1 circle center, a total of 13 microporous aeration heads (bubble size 1-3mm) are arranged, which are installed by PVC brackets and inserted 2cm below the top of the sediment. After standing for a few days, use an aerator to aerate, and cover the water COD cr The average concentration was 128.27mg / L, so the aeration parameters were 2L / min, 12h / d. The aeration was stopped on the 18th day, ...

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Abstract

The invention discloses a purifying method for black and odorous water and sediment nutrient salt. The purifying method comprises the following steps: a) carrying out aeration treatment on the surface sediment and the overlying water of the black and odorous water to synchronously reduce the ammonia nitrogen contents of the water and the surface sediment, and meanwhile immobilizing the phosphorus in the water by adsorption; b) carrying out settling treatment on the water subjected to the aeration treatment; and c) repeatedly carrying out the treatments in the steps a) and b) on the water subjected to the settling treatment until the concentration of ammonia nitrogen in the water is lower than a predetermined concentration, keeping the water standing still, and finishing the purification of the water. According to the purifying method provided by the invention, the adding of a chemical agent is not needed, while all that is needed to do is change the position of an aerator on the basis of the traditional aeration to directly oxygenate and aerate the surface sediment, so that the oxido-reduction condition of the sullage-water interface of a black and odorous river channel is effectively improved while water reoxygenation is realized, an oxidizing layer with a certain thickness is formed, the ammonia nitrogen contents of the water and the surface sediment are synchronously reduced, and meanwhile the adsorption immobilization of the phosphorus in the water is realized. After being treated according to the method, the black and odorous water is improved in transparency and reduced in odor strength.

Description

technical field [0001] The invention relates to the technical field of environmental treatment, and more specifically, the invention relates to a method for purifying black and odorous water and sediment nutrients. Background technique [0002] In recent years, with the acceleration of urbanization and the rapid development of social economy, the discharge of sewage and wastewater has increased rapidly. In addition, there are many inland rivers in cities, insufficient water power and low pollution-holding capacity, which makes black and odor prone to occur, resulting in the destruction of river ecosystems. sexual destruction. Carbon source organic matter pollution makes the water seriously hypoxic, black and smelly, and even makes aquatic organisms extinct, while nutrients such as nitrogen and phosphorus cause eutrophication in closed urban inland waters, which deteriorates the urban inland water environment and endangers the entire Urban living environment. As the main re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘波王文林盛明王国祥李振国
Owner NANTONG UNIVERSITY
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