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Method for using purified water sludge as severely-polluted river sediment masking agent

A technology for river bottom mud and polluted bottom mud, which is applied in the field of environmental governance to achieve the effect of rich content, wide sources and simple technology

Inactive Publication Date: 2012-11-14
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a method of using water purification sludge as a masking agent for heavily polluted river sediments, which solves the problem that the water purification sludge will have a certain negative effect on the water environment after being introduced into the water body. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 water purification sludge preparation experiment

[0022] Take 1kg of sedimented sludge after dehydration from the waterworks (Al 2 o 3 content is 23.6%), placed in an oven, dried at 110°C for 3 hours, then crushed, and passed through a 20-mesh sieve. Put the crushed sludge into the muffle furnace, burn it at 550°C for 2.5 hours, and take it out for later use. 26% reduction in water purification sludge. Water purification sludge regeneration is completed.

Embodiment 2

[0023] Embodiment 2 Phosphorus treatment simulation experiment of circular plexiglass container water body

[0024] A circular plexiglass container (d=17cm, h=25cm) was used as the experimental device, and 2.5L of river water (taken from a typical eutrophic still water body with a soluble phosphate content of 0.52mg / L) was added. Add 0.5 g of purified water sludge (dried sludge) after regeneration. Stir with a constant speed mixer for 10 minutes at a speed of 100 rpm, then settle for 30 minutes. The content of soluble phosphate in the water body is lower than 0.05mg / L, and the removal rate of soluble phosphate is close to 90%.

[0025] If unregenerated water purification sludge is used, the added water purification sludge is also 0.5g (dry sludge), and the experimental conditions are consistent with the above. After the experiment, the content of soluble phosphate in the water body was about 0.35 mg / L, and the removal rate of soluble phosphate was only 30%.

Embodiment 3

[0026] Example 3 Covering Experiment of Polluted Sediment in a Certain River Section

[0027] This example is used to conduct a covering experiment on the polluted sediment of a certain eutrophic river section. Since the water quality monitoring of this river section was carried out in 2004, the water body has been in a state of severe eutrophication (dissolved phosphate content 0-0.75mg / L). Excavate the undisturbed polluted sediment (the total phosphorus content of the sediment is 1408mg / kg, the organic matter content is 13%), send it to the laboratory immediately, and lay it in 3 experimental devices (0.6m×0.6m ×1.2m) bottom, the laying thickness is 30cm. Regenerated water purification sludge, unregenerated water purification sludge and no water purification sludge are laid on the bottom mud respectively, and the laying thickness is 20cm. Then, add tap water respectively, and the water depth is 50cm. The experimental device has a cover, and nitrogen is filled into the wat...

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PUM

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Abstract

The invention discloses a method for using purified water sludge as a severely-polluted river sediment masking agent. The method comprises: a purified water sludge regeneration step that purified water sludge is burned to remove organic matters, microbes and the like in the purified water sludge to make the purified water sludge treat inorganic minerals comprising aluminum oxide and the like as main components; and a severely-polluted river restoration step comprising that the regenerated purified water sludge is covered on polluted sediments of water to be restored to physically separate the polluted sediments from covered water in order to inhibit the release of polluted sediment endogenous pollutants to the water, make polluters of nitrogen, phosphorus and the like in the water be absorbed by inorganic particulate substances treating metal oxides as main components and contained in the purified water sludge, and accelerate the migration of the polluters in the water to the sediments. According to the method, the resource utilization of an aluminum resource in the purified water sludge can be realized, the harmless treatment of the purified water sludge is realized, and the water restoration is completed without destroying the ecological environment of the water.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for using purified water sludge as a masking agent for heavily polluted river bottom mud. Background technique [0002] With the improvement of urban people's living standards, the consumption of tap water is increasing day by day. As the main waste of waterworks, water purification sludge is also increasing day by day. Usually, the output of water purification sludge accounts for about 0.5%-3% of the raw water volume. For most waterworks, aluminum salts are used as coagulants. Therefore, the aluminum content of water purification sludge is relatively high, generally 15%-40%. Its main components are aluminum hydroxide and other metal oxides, hydroxides, silicates, etc. These substances have a good adsorption and fixation effect on phosphorus in water. [0003] In recent years, the urban water environment has shown a deteriorating trend, es...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
CPCY02A20/402
Inventor 李大鹏
Owner SUZHOU UNIV OF SCI & TECH
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