Riverbed sediment in-situ modification method

A technology for in-situ modification of riverbed sediment, applied in the field of environmental management, can solve the problems of inability of microorganisms to survive, a large amount of clean sediment, difficult sources, etc., and achieve the effects of good fertilizer supply performance, good nutrient status, and many available nutrients.

Inactive Publication Date: 2017-11-24
南京必蓝环境技术有限公司
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Problems solved by technology

The existing problem is that the project volume is large, a large amount of cleaning sediment is required, and the source is difficult
Its limitation is that the periodical

Method used

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Embodiment Construction

[0033] The present invention will be further described below with a specific case implemented by a certain river in the south.

[0034] The in-situ modification method of the river bed sediment includes the following steps:

[0035] Step 1. Obtain the content of organic matter and heavy metals in the bottom mud of the river bed; the organic matter in the sludge is about 3.02%, and the heavy metals include: Cu about 40.3mg / kg, Pd about 45.5mg / kg; the structure of the sludge is: pore volume 0.25 ~ 0.45ml / g, specific surface area 200~300m 2 / g, pore size 6-10nm.

[0036] Step 2, carry out sewage interception treatment on the treatment area, and isolate the polluted area to be repaired; after the sewage interception is completed, pump out the water in the treatment area until the bottom sludge layer is exposed. Specifically: use sandbags to separate the polluted area to be treated, use a pump to pump out the water in the area to be treated until the mud layer at the bottom is e...

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Abstract

The invention relates to a riverbed sediment in-situ modification method. The method includes the steps of: acquiring the content of organic matters and heavy metals in riverbed sediment; conducting sewage interception treatment on a governance area, and separating a to-be-repaired polluted area; at the end of sewage interception, pumping out the water out of the governance area until a bottom silt layer is exposed; preparing an EM bacteria fermentation broth and a soil conditioner; adding the EM bacteria fermentation broth into the silt layer, spraying the soil conditioner to the silt surface evenly as much as possible by a dosage of 500-700g/m<2>, conducting standing after spraying, then stirring the silt surface layer till formation of a granule structure; planting submerged plants or emergent plants; supplementing the water level of the governance area, and relieving isolation of the area. The sediment surface layer repaired by the method can prevent heavy metals and other harmful substances contained in the silt layer from entering water and causing pollution, the method does not destroy the original ecological environment, does not cause secondary pollution, can achieve thorough governance, and is almost free of recurrence.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to an in-situ modification method of riverbed bottom mud. Background technique [0002] At present, there are black and smelly water bodies in many cities, and the water bodies cannot be effectively treated, or there will be recurrences even after the treatment reaches the standard in a short time. caused by harmful substances. Therefore, in order to completely restore the river water, the sediment at the bottom of the river bed must be effectively treated. [0003] Sediment, as one of the three environmental elements (water quality, aquatic organisms and sediment) of the aquatic ecosystem, undertakes the dual functions of receiving exogenous pollutants and releasing nutrients into the water body, and plays a vital role in the material cycle and energy of the aquatic ecosystem. important role in the flow process. The sediment is composed of a large amo...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F11/00C02F11/14C09K17/40E02B3/02
Inventor 叶根喜刘永启蒋斌蒋宇波周宏武胡海如李小荷
Owner 南京必蓝环境技术有限公司
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