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Black-colored and odorous water body sediment in-situ treatment method

A black and odorous water, in-situ treatment technology, applied in special compound water treatment, water/sludge/sewage treatment, special treatment targets, etc., can solve the problems of insignificant degradation effect, poor sustainability, low efficiency, etc. Black and odorous water, reducing organic matter content, and repairing obvious effects

Inactive Publication Date: 2018-05-08
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degradation effect of calcium peroxide on organic carbon is not obvious; calcium nitrate can reduce the content of organic pollutants in sediment by stimulating the activity of heterotrophic microorganisms in sediment, but the addition of calcium nitrate will cause Upward floating water permeates nitrate nitrogen
Potassium permanganate and hydrogen peroxide reduce the concentration of organic carbon in sediments by oxidation, compared with potassium permanganate, H 2 o 2 The efficiency of removing organic matter is low; in addition, potassium permanganate and hydrogen peroxide have poor sustainability in controlling sediment phosphorus release, and the content of orthophosphate in sediment pore water after adding potassium permanganate is 0.344mg higher than that of the control / L

Method used

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  • Black-colored and odorous water body sediment in-situ treatment method
  • Black-colored and odorous water body sediment in-situ treatment method
  • Black-colored and odorous water body sediment in-situ treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] To collect black and odorous river sediments in Dongshan Town, Suzhou, first determine the nature of the sediments, and detect AVS, TOC, TP, PO 4 3- and TN equal content (see Table 1); 2L of black and odorous bottom sludge was placed in the reaction device (inner diameter 11cm, height 60cm).

[0028] Add restoration reagents according to the following materials and specifications: Add 80 g of FeCl 2 .4H 2 O and 82 mL of 30% hydrogen peroxide; 2-day treatment. After treatment, TOC decreased from 42.01 g / kg to 32.66 g / kg; AVS decreased from 0.055 g / kg to 0.0026 g / Kg; phosphate decreased from 0.019 g / kg to 0.0012 g / kg.

[0029] Table 1 Properties of black and odorous river sediments

[0030]

Embodiment 2

[0032] To collect black and odorous river sediments in Dongshan Town, Suzhou, first determine the properties of the sediments, among which AVS, TOC, TP, PO 4 3- and TN equal content (see Table 1); 2L of black and odorous bottom sludge was placed in the reaction device (inner diameter 11cm, height 60cm). Add restoration reagents according to the following materials and specifications: Add 80 g of FeCl 2 .4H 2 O, add 30% H in three times 2 o 2 ; Add 27.7ml respectively on days 0 / 2 / 5;

[0033] Table 2

[0034]

[0035] Generally, according to literature reports, when the concentration of hydrogen peroxide added to the Fenton oxidation method is too high, hydrogen peroxide will react with hydroxyl radicals to produce an inhibitory effect. Therefore, in order to reduce the H 2 o 2 The instantaneous concentration of hydrogen peroxide is often added in the same way as the total amount, and added in multiple times. Example 2 shows that multiple additions of H 2 o 2 It ca...

Embodiment 3

[0037] To collect black and odorous river sediments in Dongshan Town, Suzhou, first determine the nature of the sediments, and detect TOC, AVS, TP, PO 4 3- and TN equal content (same table 1); 2L of black and odorous bottom sludge is placed in the reaction device (inner diameter 11cm, height 60cm). Add repair reagents according to the following materials and specifications: Add 40 g of FeCl 2 .4H 2 O and 82mL of 30% hydrogen peroxide; after 2 days of treatment, the effects were as follows: TOC decreased from the original 42.01 g / kg dry mud to 34.66 g / kg dry mud; AVS decreased from 0.055 g / kg to 0.0046 g / Kg; Reduced from 0.019g / kg to 0.011g / kg.

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Abstract

The invention discloses a black-colored and odorous water body sediment in-situ treatment method which comprises the following steps of by investigating the characters of black-colored and odorous water body sediments, analyzing and determining distribution and contents of organic carbon, total nitrogen and total phosphorus in the sediments; injecting a remediation regent according to different depths of the sediments needing treatment and the content of the organic carbon in the sediments, wherein the remediation regent comprises an iron-containing reagent and hydrogen peroxide; and performing treatment according to the throwing addition amounts of 1-6g of the hydrogen peroxide and 0.2-12g of Fe per 1g of the organic carbon by the content of the organic carbon in the sediments. The black-colored and odorous water body sediment in-situ treatment method provided by the invention can rapidly and efficiently remove organic matters and inhibits release of phosphorus at the same time; reduces the content of the organic matters in the black-colored and odorous water body sediments and controls release of nutritive salt of the sediments starting from the root causes of the phenomena of black color and odor to reach the purpose of eliminating a black-colored and odorous water body, and is low in cost, obvious in remediation effect and wide in use range and does not have secondary pollution.

Description

technical field [0001] The invention relates to a treatment method for sediments, in particular to a treatment method for black and odorous water body sediments, which can be used for in-situ treatment of black and odorous water body sediments. Background technique [0002] Lakes and rivers are an important part of the global ecological environment, providing water resources for human survival and development. However, with the rapid economic development and population increase, water pollution has become one of the most important environmental problems in the world, especially the pollution of urban rivers. At present, more than 80% of the rivers in our country are polluted, many urban rivers have seasonal or perennial black and smelly phenomena, and the phenomenon of black and smelly urban rivers is becoming more and more common. [0003] "Black odor" means that the water body is black or pan-black visually, and it emits an odor that stimulates people's olfactory organs a...

Claims

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Application Information

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IPC IPC(8): C02F11/06
CPCC02F11/06C02F2103/007C02F2303/02C02F2305/026
Inventor 杜瑛珣巩小丽关保华刘正文
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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