CN113582319A - Composite waterproof sodium bentonite blanket for treating water body polluted by phosphorus and arsenic - Google Patents

Composite waterproof sodium bentonite blanket for treating water body polluted by phosphorus and arsenic Download PDF

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Publication number
CN113582319A
CN113582319A CN202110917722.3A CN202110917722A CN113582319A CN 113582319 A CN113582319 A CN 113582319A CN 202110917722 A CN202110917722 A CN 202110917722A CN 113582319 A CN113582319 A CN 113582319A
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China
Prior art keywords
arsenic
sodium
phosphorus
composite waterproof
water body
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CN202110917722.3A
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Chinese (zh)
Inventor
刘朝辉
刘志强
张泽
张付爽
黄仁亮
苏荣新
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Sinochem Tianjin Environmental Technology Co ltd
Zhongxin Ruimei Tianjin Environmental Protection Technology Co ltd
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Sinochem Tianjin Environmental Technology Co ltd
Zhongxin Ruimei Tianjin Environmental Protection Technology Co ltd
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Priority to CN202110917722.3A priority Critical patent/CN113582319A/en
Publication of CN113582319A publication Critical patent/CN113582319A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Abstract

The invention belongs to the technical field of water pollution control, and discloses a composite type anti-pollution agent for treating water bodies polluted by phosphorus and arsenicThe sodium-water-based bentonite blanket comprises a non-woven geotextile layer, a composite waterproof sodium-based bentonite layer and a bottom geotextile layer which are sequentially laid from top to bottom, and the layers are fixed together by utilizing fibers of the non-woven geotextile layer through a needling process. Wherein the composite waterproof sodium-based bentonite layer is prepared by loading La on the sodium-based bentonite by spraying or dipping3+、Ce3+And Fe3+And (4) realizing. The preparation process is simple and convenient, has low economic cost, and is suitable for treating the ecological environment of water bodies polluted by phosphorus and arsenic.

Description

Composite waterproof sodium bentonite blanket for treating water body polluted by phosphorus and arsenic
Technical Field
The invention belongs to the technical field of water pollution prevention and control, and particularly relates to a composite waterproof sodium bentonite blanket used in water environment treatment engineering and used for treating water bodies polluted by phosphorus and arsenic, and a preparation method of the composite waterproof sodium bentonite blanket.
Background
In the national war of pollution prevention and treatment and attack, water pollution prevention and treatment is one of important contents, wherein phosphorus-rich and arsenic-rich polluted water bodies are water bodies for ecological environment treatment, such as water bodies of Yanzong sea, great tun sea, Anhui nest lake, Jiangsu Taihu lake and the like, which have the problem of phosphorus-rich and arsenic pollution, the invention CN104074206A discloses a geotechnical pad for preventing heavy metal pollution and a preparation method thereof, but the problems of complex preparation procedure, high cost and the like exist. The invention CN102557221A discloses a method for treating phosphorus in eutrophic water by using alum-modified nano bentonite as a passivating agent, which does not relate to the problem of arsenic pollution treatment. The treatment technology which can solve the problem of phosphorus and arsenic composite pollution of the water body at the same time of high efficiency and low cost is not broken through.
Disclosure of Invention
The invention mainly aims to solve the problems in the prior art, and provides the composite waterproof sodium-based bentonite blanket which is simple in production process, can simultaneously and efficiently remove phosphorus and arsenic pollution in a water body, is low in cost, and simultaneously has good integral anti-seepage performance and mechanical performance.
The technical scheme of the invention for realizing the aim is as follows:
a composite waterproof sodium bentonite blanket for treating water body rich in phosphorus and arsenic and a preparation method thereof comprise the following steps: laying a non-woven geotextile layer, a composite waterproof sodium-based bentonite layer and a bottom geotextile layer from top to bottom; the nonwoven geotextile layer and the bottom geotextile layer are fixedly connected together through barbed fibers.
The composite waterproof sodium-based bentonite blanket for treating water bodies rich in phosphorus and arsenic comprises a bottom geotextile layer selected from non-woven fabrics or woven fabrics. The non-woven geotextile layer is selected from polypropylene non-woven fabric or polyester non-woven fabric; the woven cloth is polypropylene woven cloth.
The composite waterproof sodium-based bentonite blanket for treating the water body polluted by the phosphorus and the arsenic is realized by loading active substances for treating the phosphorus and the arsenic pollution on the sodium-based bentonite in a spraying or dipping mode, and the dipping mode is optimized, namely the waterproof sodium-based bentonite is dipped in an aqueous solution containing the active substances with the weight percentage content of 1-99% for 24 hours and then naturally aired or dried. The active substance is La3+、Ce3+、Fe3+One or more combinations of salts or oxides or hydroxides, preferably LaCl3、CeCl3、FeCl3The combination of the three components has a mole ratio of 0.5-10: 0.05-0.5: 1-20. The potential chemical reactions of active substances in phosphorus and arsenic polluted water bodies are as follows:
La3++AsO4 3-→LaAsO4↓
Ce3++AsO4 3-→CeAsO4↓
Fe3++AsO4 3-→FeAsO4↓
La3++PO4 3-→LaPO4↓
Ce3++PO4 3-→CePO4↓
through verification, the traditional method adopts the addition of Fe3+The removal of arsenic in the water body by the adsorbent mode is only 45.45-60.54%, but the problem of phosphorus pollution still exists; the traditional method adopting the nano bentonite as the passivating agent can reduce the release amount of about 60 percent of phosphorus in the eutrophic water body sediment, but the arsenic pollution to the water body still exists. The composite waterproof sodium bentonite blanket disclosed by the invention enables the sodium bentonite to load La through a spraying or dipping mode3+、Ce3+、Fe3+Realize the removal of phosphorus and arsenic in water, La3+、Ce3+、Fe3+The chemical reaction can be carried out in phosphorus and arsenic polluted water body, the phosphorus and arsenic in the polluted water body can be efficiently removed, the removal rate of the phosphorus is up to more than 90%, and the release amount of the bottom mud in the polluted water body is reduced by more than 80%, so that the synergistic reaction of the composite waterproof sodium bentonite blanket can remove the phosphorus in the polluted water body while removing the sediment formed by the arsenic, and the composite waterproof sodium bentonite blanket can realize the effect of removing the phosphorus in the polluted water body at a lower La3+、Ce3+、Fe3+The loading capacity reaches higher removal rate of phosphorus and arsenic in the polluted water body, the synergistic reaction realizes the removal of arsenic in the polluted water body and simultaneously efficiently promotes the inhibition of phosphorus release amount, the removal rate of arsenic reaches more than 90%, and simultaneously the release amount of sediment in the polluted water body is reduced by more than 80%.
The permeability coefficient of the composite waterproof sodium-based bentonite layer is less than or equal to 10-10m/s, and has good anti-seepage function.
The composite waterproof sodium bentonite blanket has breaking strength higher than 15kN/m, elongation higher than 10% and peeling strength higher than 40N/10 cm. Can be used in the engineering project construction of water pollution treatment and polluted bottom mud in-situ treatment.
Compared with the prior art, the beneficial effects of the invention include:
(1) the invention can simultaneously remove phosphorus and arsenic pollutants in the water body and can also be used for in-situ covering, blocking and treating the phosphorus and arsenic polluted bottom mud.
(2) The material of the invention is easy to obtain, easy to prepare, simple and convenient to construct, only needs to be laid and lapped, and is easy to popularize and apply.
(3) The method has low cost, less amount of generated precipitated waste, and the arsenic toxicity leaching result meets the requirement of environmental protection.
Drawings
Fig. 1 is a schematic view of the composite waterproof sodium bentonite blanket of the invention.
In the drawings: 1. non-woven geotextile layer, 2, composite waterproof sodium-based bentonite layer, 3, bottom geotextile layer, 4 and barbed fiber
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1
As shown in fig. 1, a composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body comprises: laying a non-woven geotextile layer (1), a composite waterproof sodium-based bentonite layer (2) and a bottom geotextile layer (3) from top to bottom; the non-woven geotextile layer (1) and the bottom geotextile layer (3) are fixedly connected together through barbed fibers (4).
The non-woven geotextile layer (1) is a polypropylene short fiber non-woven fabric with the density of 200-230 g/m. The bottom geotextile layer (3) is a polypropylene flat filament woven cloth of 110-150 g/square meter. The composite waterproof sodium-based bentonite layer (2) is realized by loading active substances for treating phosphorus and arsenic-rich pollution on the sodium-based bentonite in an impregnation mode, namely the waterproof sodium-based bentonite is naturally dried after being impregnated in an aqueous solution containing 80% of the active substances by weight percentage for 24 hours, wherein the mass ratio of the active substances to the sodium-based bentonite is 1: 1000. the active substance is LaCl3、CeCl3、FeCl3Mixture of (1), LaCl3、CeCl3、FeCl3The molar ratio is 1: 0.1: 10. the gram weight of the waterproof nano bentonite material layer before impregnation is 4300 g/square meter. The permeability coefficient of the composite waterproof sodium-based bentonite layer (2) is less than or equal to 10-10m/s。
The composite waterproof sodium-based bentonite blanket obtained in the embodiment 1 is used for a simulation experiment for treating water, a phosphorus and arsenic-rich bottom mud sample and a sewage sample collected in a certain lake reservoir of Yunnan age are placed in a square glass container with the length, width and height of 40cm multiplied by 20cm multiplied by 50cm, the bottom mud is paved at the bottom, the composite waterproof sodium-based bentonite blanket is cut into a square with the length of 40cm multiplied by 20cm and paved above the bottom mud, and the phosphorus and arsenic content in a supernatant is detected after the composite waterproof sodium-based bentonite blanket is kept stand for 48 hours and is lower than the requirements of three indexes of 'quality standard of surface water environment' (GB 3838-2002). And (3) performing an arsenic toxicity leaching test on the compound waterproof sodium-based bentonite blanket after pollution treatment according to a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (J/T299), wherein the arsenic content of a leaching solution is lower than 5 mg/L. The test results are shown in Table 1.
Example 2
The difference from example 1 is: LaCl3、CeCl3、FeCl3In a molar ratio of 5: 0.5: 10.
the test results are shown in Table 1.
Example 3
The difference from example 1 is: LaCl3、CeCl3、FeCl3In a molar ratio of 10: 0.5: 20.
the test results are shown in Table 1.
Example 4
The difference from example 1 is: LaCl3、CeCl3、FeCl3In a molar ratio of 5: 0.2: 1. the test results are shown in Table 1.
Comparative example 1
The difference from example 1 is: containing no LaCl3，CeCl3、FeCl3In a molar ratio of 0.1: 10. the test results are shown in Table 1.
Comparative example 2
The difference from example 1 is: containing no FeCl3，LaCl3、CeCl3Are 1:0.1, respectively. The test results are shown in Table 1.
Comparative example 3
The difference from example 1 is: not containing CeCl3，LaCl3、FeCl3In a molar ratio of 1:10, respectively. The test results are shown in Table 1.
Comparative example 4
The difference from example 1 is: using only LaCl3. The test results are shown in Table 1.
Comparative example 5
The difference from example 1 is: using only CeCl3. The test results are shown in Table 1.
Comparative example 6
The difference from example 1 is: using FeCl only3. The test results are shown in Table 1.
Figure BDA0003206257920000041
Figure BDA0003206257920000051
Figure BDA0003206257920000061
It can be seen from table 1 that the composite waterproof sodium-based bentonite carpet obtained in example 1, example 2, example 3 and example 4 has a phosphorus removal rate of 83.63% and a far greater removal rate of 93.85% for phosphorus and arsenic-contaminated sediment samples and sewage samples collected from a certain lake reservoir of old Yunnan province, compared with comparative examples 1-6.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims (7)

1. A composite waterproof sodium bentonite blanket for treating water body rich in phosphorus and arsenic pollution is characterized in that: the method comprises the following steps: a non-woven geotextile layer (1), a composite waterproof sodium-based bentonite layer (2) and a bottom geotextile layer (3) which are laid from top to bottom; the non-woven geotextile layer(1) Fixedly connecting the three parts with the bottom geotextile layer (3) through barbed fibers (4); the compound waterproof sodium-based bentonite layer (2) is impregnated or sprayed with La3+、Ce3+And Fe3+The nano bentonite.
2. The composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 1, which is characterized in that: the La3+、Ce3+、Fe3+0.5-10: 0.05-0.5: 1-20.
3. The composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 1, which is characterized in that: la3+、Ce3+And Fe3+From La-containing3+Or Ce3+Or Fe3+Salts or oxides or hydroxides.
4. The composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 3, which is characterized in that: la3+、Ce3+And Fe3+Are respectively from LaCl3、CeCl3、FeCl3。
5. The composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 1, which is characterized in that: la3+、Ce3+And Fe3+The mass ratio of the total amount of the nano bentonite to the nano bentonite is 1: 1000.
6. the composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 1, which is characterized in that: the bottom geotextile layer (3) is a polypropylene flat filament woven cloth of 110-150 g/square meter.
7. The composite waterproof sodium bentonite blanket for treating phosphorus and arsenic-rich polluted water body according to claim 1, which is characterized in that: the non-woven geotextile layer (1) is a polypropylene short fiber non-woven fabric with the density of 200-230 g/m.
CN202110917722.3A 2021-08-11 2021-08-11 Composite waterproof sodium bentonite blanket for treating water body polluted by phosphorus and arsenic Pending CN113582319A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101264955A (en) * 2008-04-25 2008-09-17 清华大学 Process for preparing bentonite dephosphorization water purification agent
CN201284241Y (en) * 2008-04-25 2009-08-05 清华大学 Anti-seepage algal inhibition rug for landscape water
US20090321351A1 (en) * 2006-06-14 2009-12-31 Young William I Bioremediation blanket and method of use
CN202830993U (en) * 2012-07-10 2013-03-27 捷高科技（苏州）有限公司 Corrosion resistance type sodium bentonite waterproof blanket
CN107311277A (en) * 2017-07-04 2017-11-03 贵州美瑞特环保科技有限公司 It is a kind of while removing nanometer medicament and preparation method thereof of arsenic phosphorus fluorine in water removal
CN208558484U (en) * 2018-05-28 2019-03-01 天津中联格林科技发展有限公司 A kind of bilayer Na-bentonite soil type waterproof blanket and production line
CN110607808A (en) * 2019-10-16 2019-12-24 北京高能时代环境技术股份有限公司 In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090321351A1 (en) * 2006-06-14 2009-12-31 Young William I Bioremediation blanket and method of use
CN101264955A (en) * 2008-04-25 2008-09-17 清华大学 Process for preparing bentonite dephosphorization water purification agent
CN201284241Y (en) * 2008-04-25 2009-08-05 清华大学 Anti-seepage algal inhibition rug for landscape water
CN202830993U (en) * 2012-07-10 2013-03-27 捷高科技（苏州）有限公司 Corrosion resistance type sodium bentonite waterproof blanket
CN107311277A (en) * 2017-07-04 2017-11-03 贵州美瑞特环保科技有限公司 It is a kind of while removing nanometer medicament and preparation method thereof of arsenic phosphorus fluorine in water removal
CN208558484U (en) * 2018-05-28 2019-03-01 天津中联格林科技发展有限公司 A kind of bilayer Na-bentonite soil type waterproof blanket and production line
CN110607808A (en) * 2019-10-16 2019-12-24 北京高能时代环境技术股份有限公司 In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method

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Application publication date: 20211102