In-situ black-odor river bottom mud repairing material as well as potting and application thereof

A technology for river bottom mud and repair materials, applied in the field of environmental governance, can solve the problems of poor effect of particulate pollutants, low bottom mud repair efficiency, high investment cost, etc., and achieve no secondary pollution risk, construction and maintenance management Convenience and low operating costs

Active Publication Date: 2019-06-21
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the above-mentioned treatment methods are not efficient in sediment restoration, and the effect on particulate pollutants in water is not good, and t

Method used

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  • In-situ black-odor river bottom mud repairing material as well as potting and application thereof
  • In-situ black-odor river bottom mud repairing material as well as potting and application thereof
  • In-situ black-odor river bottom mud repairing material as well as potting and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The bottom mud and overlying water used in this embodiment are taken from the bottom mud and overlying water of a black and smelly river in a certain city. It is a small-scale laboratory test and three reactors are set: L×W×=10×10× 3m, of which No. 1 reactor is only placed with ① the part of oxygen-releasing repair agent; No. 2 reactor is only added with ② the part of strengthening microbial enrichment elastic filler; No. 3 reactor "plants" the complete repair material.

[0075] The bottom mud of the black and odorous river is placed in the reactor, the thickness of the bottom mud is 1m, and the depth of the overlying water is 1m. Place 2 trees in each reactor, ① part of the oxygen-releasing repair agent is planted in the bottom mud, the planting depth is 0.5m, and the interval is 5m, ② part of the elastic filler for strengthening microbial enrichment stays in the overlying water area, and the part of the filler placed in the water is kept at 1.5m (Note: The "potted pla...

Embodiment 2

[0080] This embodiment takes the black and smelly river reservoir in a certain city as an example. The reservoir may cover an area of ​​about 500km 2 The main reason for the black and smelly is that there are a lot of untreated aquaculture wastewater discharged into it. Plant 50 potted plants of this restoration material in the reservoir. After 5 days, the color of the sediment can obviously turn yellow. After 15 days, the biofilm of the reinforced microbial filler grows completely and stably. The apparent transparency of the water body increases from 10cm to 25cm. The oxidation-reduction potential and dissolved oxygen have obvious changes, among which the dissolved oxygen increased from 0.2mg / L to 3.4mg / L, and the oxidation-reduction potential increased from -235mV to 122mV. After 20d, COD and NH 3 The removal rates of -N reached 72% and 64% respectively. After 45 days, the detection indicators of the black and odorous water body sediment and overlying water all turned from s...

Embodiment 3

[0082] This embodiment takes a fish pond as an example. Due to the addition of organic matter such as initial rain runoff and feed, a large amount of organic pollutants are deposited, causing black and odorous water bodies and sediments. "Planted" 5 potted plants of the restoration material in the pond. After a week of restoration, the odor in the water body gradually eliminated, the transparency of the water body improved, the dissolved oxygen in the water increased from 0.2mg / L to 3.3mg / L, and the oxidation-reduction potential increased from - 55mV increased to 220mV, COD and NH in sediment and water after 15 days 3 -N removal rate reached above 90%. The color of the bottom mud gradually changed from black to khaki, and the bottom mud returned to black, indicating that the new material has a remarkable repair performance on bottom mud and overlying water.

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Abstract

The invention provides an in-situ black-odor river bottom mud repairing material as well as a potting and application thereof. The in-situ black-odor river bottom mud repairing material comprises an oxygen releasing repairing agent and an enhanced microbial enriched elastic filler, wherein the oxygen releasing repairing agent is polylactic acid coated with CaO2/FeCl3, the enhanced microbial enriched elastic filler comprises an iron modified bentonite-sodium alginate coated three-dimensional filler and a microbial agent, and the microbial agent is located on the surface of the iron modified bentonite-sodium alginate coating. By adopting the in-situ black-odor river bottom mud repairing material provided by the invention, the treatment of pollutants in water and the repair of bottom mud arerealized at the same time, the operation method is simple, the repairing efficiency of the bottom mud per unit area is high, the material is environmentally-friendly, and the investment cost is low.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to an in-situ repair material for black and odorous river bottom mud, a potted plant and its application. Background technique [0002] Sediment is an important part of the water ecosystem and the main storage pool for pollutants and nutrients. After a large number of pollutants enter the water body, they adhere to the sediment through physical and chemical effects such as adsorption, precipitation, and complexation, resulting in sediment pollution. Although measures such as strengthening interception and sewage treatment can reduce the pollution load entering the receiving water body, the endogenous release of sediment pollution has largely restricted the improvement of the polluted water body, and has become an important secondary factor that affects and restricts the improvement of water quality. source of pollution. A large amount of heavily pollute...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/02
Inventor 王宏杰董文艺王锋
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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