CN111377496A

CN111377496A - Water environment restoration agent for reducing heavy metal content in water

Info

Publication number: CN111377496A
Application number: CN201910712705.9A
Authority: CN
Inventors: 闫陶军; 赵伟亮
Original assignee: Huanya Tianjin Environmental Protection Technology Co ltd
Current assignee: Huanya Tianjin Environmental Protection Technology Co ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-07-07

Abstract

The invention provides a water environment restoration agent for reducing heavy metal content in water, which comprises the following preparation raw materials in percentage by mass: 70-80% of natural zeolite powder, 5-10% of diatomite, 5-10% of modified clay, 5-7% of sodium humate and 3-5% of complexing agent. Because the natural zeolite powder, the diatomite and the modified clay in the repairing agent have very high porosity and have good flocculation effect. When the water body with the easily excessive heavy metals is treated, the heavy metals can be quickly complexed, then the heavy metals are solidified into the bottom mud through the adsorption, flocculation and precipitation effects, the secondary leaching is not easy, the content of the heavy metals in the water body is greatly reduced, and the harm to aquatic animals and plants is reduced.

Description

Water environment restoration agent for reducing heavy metal content in water

Technical Field

The invention belongs to the technical field of surface water purification treatment, and particularly relates to a water environment restoration agent for reducing the content of heavy metals in water.

Background

Heavy metal pollution means environmental pollution caused by metals or compounds thereof having a density of 5 or more, and in terms of environmental pollution, heavy metals mean heavy metals having significant biological toxicity such as mercury, cadmium, lead, and "metalloid" -arsenic. The most harmful to human bodies are 5 types: lead, mercury, arsenic, cadmium. The heavy metals cannot be decomposed in water, and after drinking, the heavy metals have amplified toxicity and are combined with other toxins in the water to generate organic matters with higher toxicity. Mainly caused by human factors such as mining, waste gas discharge, sewage irrigation, heavy metal product use and the like. Causing great harm to the environment and human health.

Along with the development of modern society becoming faster and faster, the people's living standard is continuously improved, and a large amount of domestic sewage, agricultural irrigation water, domestic garbage, industrial wastewater and surface runoff with larger pollution load directly flow into the water, so that the concentration of the ammonia nitrogen in the riverway is higher, and in the practical engineering application, how to reduce the concentration of the ammonia nitrogen in the water, how to improve aerobic and facultative anaerobic microorganisms in sludge and digest sludge are the key of the method for improving the water quality of the water and comprehensively treating black and odorous water. The existing water purifying agent almost adopts a chemical preparation formula, although the formula has a certain effect on treating the water quality of black and odorous water, the water quality is difficult to meet the requirement of aquaculture, and the water quality can be repeatedly deteriorated along with residual baits and culture excrement generated in the aquaculture process, at the moment, a water purifying agent product without harm, simple operation, low cost and good practicability needs to be added, and the conventional chemical preparation has no continuity and great harm and cannot meet the requirement.

Disclosure of Invention

According to the technical problems, the invention provides a water environment restoration agent for reducing the content of heavy metals in water.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the water environment restoration agent for reducing the content of heavy metals in water is characterized by comprising the following preparation raw materials in percentage by mass: 70-80% of natural zeolite powder, 5-10% of diatomite, 5-10% of modified clay, 5-7% of sodium humate and 3-5% of complexing agent.

The natural zeolite powder is 180-mesh and 200-mesh, and the purity is more than 70 percent.

The diatomaceous earth porosity is greater than 80%.

The complexing agent is EDTA.

The modified clay is prepared by cation modification, and the preparation method comprises the following steps of mixing the raw materials in a solid-to-liquid ratio of 1: 10 placing clay into an aluminum salt/magnesium salt (molar ratio is 4: 1) mixed solution with a certain concentration (0.21mol/L, calculated as magnesium salt) and stirring for 2h, standing for 4h, then carrying out suction filtration, washing for a plurality of times by using distilled water, drying for 1h at 80 ℃, grinding, and then sieving by using a 80-mesh sieve to obtain the modified clay required by the mineral restoration agent.

The sodium humate is coal-based water-soluble sodium humate, and the content of effective substances is more than or equal to 70%.

The weights of the natural zeolite powder, the diatomite, the modified clay, the sodium humate and the complexing agent are dry weight measurements.

The preparation raw materials comprise 70 percent of natural zeolite powder, 10 percent of diatomite, 10 percent of modified clay, 5 percent of sodium humate and 5 percent of complexing agent.

The preparation raw materials comprise 75% of natural zeolite powder, 10% of diatomite, 5% of modified clay, 7% of sodium humate and 3% of complexing agent.

The preparation raw materials comprise 80 percent of natural zeolite powder, 5 percent of diatomite, 5 percent of modified clay, 7 percent of sodium humate and 3 percent of complexing agent.

The invention has the beneficial effects that: the repairing agent provided by the invention takes natural minerals as main components, is used after being dissolved in water, is convenient to operate, and is environment-friendly and free of secondary pollution after being used. When the water body with the easily excessive heavy metals is treated, the heavy metals can be quickly complexed, then the heavy metals are solidified into the bottom mud through the adsorption, flocculation and precipitation effects, the secondary leaching is not easy, the content of the heavy metals in the water body is greatly reduced, and the harm to aquatic animals and plants is reduced. The complexing agent can form a stable water-soluble complex with alkali metal, rare earth elements, transition metal and the like, and the repairing agent added with the complexing agent is added into the sewage, so that the purifying and repairing effects of the sewage can be improved. The invention also adds sodium humate, which is added into the repairing agent to improve the sewage purification efficiency, and the sodium humate can exist in water sources to provide rich nutrient components for animals and plants in water.

Because the natural zeolite powder, the diatomite and the modified clay in the repairing agent have very high porosity and have good flocculation effect. When the water body with the easily excessive heavy metals is treated, the heavy metals can be quickly complexed, then the heavy metals are solidified into the bottom mud through the adsorption, flocculation and precipitation effects, the secondary leaching is not easy, the content of the heavy metals in the water body is greatly reduced, and the harm to aquatic animals and plants is reduced.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

Example 1

A multi-year garbage storage yard is arranged around a certain pond, and when rainwater and nearby surface runoff are received in summer, peripheral garbage hills are gradually washed to form irregular pits, water becomes brown, odor is emitted, transparency is almost 0, and garbage at the bottom of the pond continuously pollutes the water. COD in the water: 350mg/L, ammonia nitrogen: 60mg/L, total phosphorus: 2.5 mg/L. According to the dosage of 2000m3 water body treated by each ton of mineral restoration agent, the formula of the mineral restoration agent comprises 70% of natural zeolite powder, 10% of diatomite, 10% of modified clay, 5% of sodium humate and 5% of EDTA, and the mineral restoration agent is added for 10 days, so that the water quality reaches COD: 80mg/L, ammonia nitrogen: 4.8mg/L, total phosphorus: 0.5mg/L, and discharging water bodies in the pond into peripheral rivers after the treatment is finished.

Example 2

In a river channel, the water body and the bank slopes on two sides become reddish brown due to the fact that peripheral factories steal, discharge and reverse pickling wastewater, the pH value is 2-3, ammonia nitrogen is 52.5mg/L, COD 825mg/L, waste acid pollution is caused, bottom mud pollution is caused, and heavy metal pollution seriously exceeds the standard. According to the dosage of 1500m3 water body treated by each ton of mineral restoration agent, the formula of the mineral restoration agent comprises 75% of natural zeolite powder, 10% of diatomite, 5% of modified clay, 7% of sodium humate and 3% of EDTA, and after the mineral restoration agent is added for 10 days, the water quality reaches COD: 110mg/L, ammonia nitrogen: 4.5mg/L, total phosphorus: 0.6 mg/L. After treatment, the water environment is recovered, the pH value is 7-8, the sediment is sealed and solidified to form a good sand layer, and the transparency of the water body is recovered. After three months of maintenance, all indexes of the water quality are recovered to be normal.

Example 3

A riverway around a certain aquaculture pond is influenced by aquaculture activities (wastewater discharge and organic fertilizer pollution), the COD (chemical oxygen demand) of a water body is 332mg/L, the ammonia nitrogen content is 32.1mg/L, and the total phosphorus content is 7.8 mg/L. According to the dosage of 1500m3 water body treated by each ton of mineral restoration agent, the mineral restoration agent is prepared from 80% of natural zeolite powder, 5% of diatomite, 5% of modified clay, 7% of sodium humate and 3% of EDTA. After 5 days of adding, the water quality COD is 137mg/L, the ammonia nitrogen is 1.8mg/L, the total phosphorus is 0.3mg/L, the transparency of the river water body is increased, and after one month of maintenance, all indexes of the water quality except the COD are recovered to be normal.

Example 4

A river channel of the urban and rural junction is influenced by domestic sewage and garbage of surrounding residents and emits peculiar smell, the transparency is lower than 10cm, COD is 265mg/L, ammonia nitrogen is 17.9mg/L, and total phosphorus is 4.2 mg/L. According to the using amount of 1500m3 water body treated by each ton of mineral restoration agent, the formula of the mineral restoration agent comprises 75% of natural zeolite powder, 5% of diatomite, 10% of modified clay, 7% of sodium humate and 3% of EDTA, wherein after 10 days of addition, the water quality COD is 56mg/L, the ammonia nitrogen is 6.2mg/L, the total phosphorus is 0.5mg/L, the peculiar smell of the river channel is eliminated, and the transparency of the water body is more than 30 cm. After the maintenance for one month, except ammonia nitrogen, other indexes of the water quality are recovered to be normal.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The water environment restoration agent for reducing the content of heavy metals in water is characterized by comprising the following preparation raw materials in percentage by mass: 70-80% of natural zeolite powder, 5-10% of diatomite, 5-10% of modified clay, 5-7% of sodium humate and 3-5% of complexing agent.

2. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the natural zeolite powder is 180-mesh and 200-mesh, and the purity is more than 70 percent.

3. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the diatomaceous earth porosity is greater than 80%.

4. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the complexing agent is EDTA.

5. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the modified clay is prepared by cation modification, and the preparation method comprises the following steps of mixing the raw materials in a solid-to-liquid ratio of 1: 10 placing clay into an aluminum salt/magnesium salt (molar ratio is 4: 1) mixed solution with a certain concentration (0.21mol/L, calculated as magnesium salt) and stirring for 2h, standing for 4h, then carrying out suction filtration, washing for a plurality of times by using distilled water, drying for 1h at 80 ℃, grinding, and then sieving by using a 80-mesh sieve to obtain the modified clay required by the mineral restoration agent.

6. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the sodium humate is coal-based water-soluble sodium humate, and the content of effective substances is more than or equal to 70%.

7. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the weights of the natural zeolite powder, the diatomite, the modified clay, the sodium humate and the complexing agent are dry weight measurements.

8. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the preparation raw materials comprise 70 percent of natural zeolite powder, 10 percent of diatomite, 10 percent of modified clay, 5 percent of sodium humate and 5 percent of complexing agent.

9. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the preparation raw materials comprise 75% of natural zeolite powder, 10% of diatomite, 5% of modified clay, 7% of sodium humate and 3% of complexing agent.

10. The agent for restoring an aqueous environment for reducing the content of heavy metals in water according to claim 1, which is characterized in that: the preparation raw materials comprise 80 percent of natural zeolite powder, 5 percent of diatomite, 5 percent of modified clay, 7 percent of sodium humate and 3 percent of complexing agent.