CN101781005B - Ecological precipitator - Google Patents

Abstract

The invention discloses an ecological precipitant, a preparation method and an application method thereof, which are used for purification and pretreatment of composite artificial wetland sewage. It is composed of component A and component B with a ratio of parts by weight of 1:1.4-2, component A contains 40-50 wt% reed, 30-40 wt% water hyacinth and 15-25 wt% lotus leaf, component B It is composed of diatomaceous earth, vermiculite and activated carbon with a weight ratio of 1:2:3. The preparation method of component A is to mix the three kinds of plants according to the above weight fractions, break and stir them, soak them in deionized water, and extract a 30wt% concentrated solution, and the preparation method of component B is to mix diatomite, vermiculite and activated carbon according to The ratio of parts by weight is 1:2:3 and mixed into powder, and component A and component B are mixed according to the ratio of parts by weight of 1:1.4-2 and added to a kneader for stirring. When used, the dosage is 0.2-0.65% of the sewage weight. The ecological precipitant is economical, efficient and has high ecological safety.

Description

an ecological precipitant

technical field

The invention relates to the field of sewage purification treatment, in particular to a precipitation technology applied to the sewage purification and pretreatment stage of composite constructed wetlands, in particular to an ecological precipitant applied to the sewage purification and pretreatment of composite constructed wetlands and its preparation method and application method. the

Background technique

With the rapid development of my country's social economy, the amount of sewage discharge is increasing year by year. With the development of new ecological technologies in the past few years, the constructed wetland method of sewage treatment has become more and more popular. In order to prevent the constructed wetland system from carrying excessive Suspended solids (SS) or impurities are clogged, and pretreatment is required. The effect of the precipitant in the pretreatment stage plays an important role in the stable operation of the system. As an ecological and environmentally friendly sewage treatment technology, the constructed wetland treatment system requires The upstream and downstream processing links all have matching ecological processing technologies. As far as the overall production and application of precipitants in China is concerned, it is still difficult to find matching products. The main manifestations are: the existing non-polar precipitants have single functions, limited range of applicable water bodies, and large usage. Large volume, slow sedimentation speed, difficult sludge dehydration and high cost of sludge disposal, especially aluminum ions remaining in the water body, will cause unnecessary pollution; organic synthetic polymer precipitants not only have high production costs, but also Moreover, it is harmful to human health during the production and synthesis process, and it is difficult to degrade after use. It accumulates in the natural environment and exists for a long time, causing secondary pollution to the environment, and a small part of the degraded substances are very toxic and carcinogenic. . Existing precipitants are difficult to meet the sedimentation needs in the pretreatment stage of sewage purification in constructed wetlands. the

Contents of the invention

The technical problem to be solved by the present invention is to provide an eco-precipitant that is economical, efficient, high in ecological safety, free from secondary pollution and friendly to the environment. the

The present invention also provides a preparation method of the above-mentioned ecological precipitation agent. the

The present invention further provides an application method of the above-mentioned ecological precipitation agent. the

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an ecological precipitating agent, which is used for the purification and pretreatment of composite constructed wetland sewage, which consists of component A and component B composition, the A component contains 40-50wt% reed, 30-40wt% water hyacinth and 15-25wt% lotus leaf, and the B component is composed of diatomite with a weight ratio of 1:2:3 , vermiculite, activated carbon composition. the

The preparation method of the above-mentioned ecological precipitant provided by the present invention is: prepare component A and component B respectively, and the preparation method of component A is to mix 40-50wt% reed, 30-40wt% water hyacinth and 15-25wt% lotus The leaves are smashed and stirred, soaked in deionized water for 10-15 days, and then the soaking solution is concentrated to a concentration of 30wt%;

The preparation method of component B is to weigh diatomaceous earth and vermiculite according to the weight ratio of 1:2, mix them, grind them to 350-450 mesh at a temperature of 150-350°C, and then mix them with activated carbon of the same mass and grade. , and finally put the mixture of the three into a blender and stir evenly to form a powder;

Add the obtained component A and component B into a high-speed kneader at a ratio of 1:1.4-2 by weight, heat to 50-90° C., and stir for 20-30 minutes. the

The application method of the above-mentioned ecological precipitant provided by the present invention is: when used for sewage pretreatment and precipitation, the addition amount of the ecological precipitant is 0.2 to 0.65% of the weight of the sewage, and after being put in, it is fully stirred and mixed, and then the sewage is filtered and drawn out. Can. the

The working principle of this ecological precipitant is: when the ecological precipitant applied to the sewage purification treatment of composite constructed wetlands is added to the sewage, it rapidly diffuses into the water body under high-speed stirring, and at this time, the unbalanced potential on the surface of the ecological precipitant neutralizes the suspension The charge potential of ions weakens their repulsion potential, and colloidal substances, suspended solids, and partially dissolved substances form flocs or condense into larger flocs due to the effects of bonding, netting, sweeping, etc. , due to the huge surface area of the ecological precipitant and the strong adsorption force of the nano-pore volume, the fine substances and viruses in the sewage are adsorbed into the surface area. At the same time, the ecological precipitant will release allelochemical substances that can inhibit or kill algae. On the one hand, the allelochemical substances can kill algae in sewage, and on the other hand, they can inhibit the growth of algae. Then the floc particles are rapidly precipitated under the action of gravity and separated from the treated clean water, so that the turbidity, color, organic matter, inorganic matter and algae of the water body are precipitated and removed. the

The beneficial effects produced by adopting the above technical scheme are: 1. This ecological precipitant has excellent flocculation, strong adsorption, less consumption, fast flocculation speed, large alum flower size, fast settling speed of flocs, and short clarification time; It not only has a significant removal effect on suspended solids and impurities in sewage, but also kills or inhibits the growth of viruses, fungi and algae; it is non-toxic, harmless, non-polluting, does not produce derivatives, and is safe and environmentally friendly. the

2. The preparation process of the present invention is simple, no complex equipment and any chemical substances are required, the production cycle is short, and the cost is low. the

3. The present invention is applied to artificial composite wetland sewage purification pretreatment, which can greatly reduce the treatment pressure of sewage in the subsequent treatment process. the

Detailed ways

The present invention will be described in further detail below in combination with specific embodiments. the

In the following examples, SS is suspended matter, and CODcr is chemical oxygen demand. the

Example 1

For the sewage of a paper mill, the main indicators of the water quality before treatment are: SS is 1067mg/L, CODcr is 4800mg/L, and the chroma is 96. the

The preparation method of the used ecological precipitant is as follows: first, according to the percentage by weight, after breaking and stirring 45% of reeds, 35% of water hyacinth and 20% of lotus leaves, soaking in deionized water for 13 days, extracting 30% of the concentrated solution , to prepare component A; then mix vermiculite and diatomaceous earth in a ratio of 2:1 by weight, grind to 380 mesh at a temperature of 150-350°C, and then mix in the mixture with the above-mentioned vermiculite and diatomite Activated carbon with the same mass and the same level of particles, and stir evenly to form powder, to prepare component B; mix component A and component B at a weight ratio of 1:1.5, add to a high-speed kneader, heat to 85 ° C and stir In 20 minutes, the ecological precipitant is prepared. The ecological precipitant is added to the sewage according to 0.65% of the weight of the required pretreatment water, and then the pretreatment of the sewage is completed through processes such as stirring, flocculation, adsorption, algae killing, and precipitation separation. the

The water quality after treatment is: SS is 47.7mg/L, CODcr is 180mg/L, chromaticity is 12, and the removal rates are 95.5%, 96.3%, and 87.5%, respectively. the

Example 2

For the sewage of a paper mill, the main indicators of the water quality before treatment are: SS is 1067mg/L, CODcr is 4800 mg/L, and the chroma is 96. the

The preparation steps of the ecological precipitant used are as follows: first, according to the percentage by weight, 40% of reeds, 30% of water hyacinth, and 15% of lotus leaves are broken and stirred, soaked in deionized water for 14 days, and 30% of the concentrated solution is extracted , to prepare component A; then mix the vermiculite and diatomaceous earth with a ratio of 2:1 by weight, grind to 400 mesh at a temperature of 150-350°C, and then mix in activated carbon of the same quality and grade of particles, and Stir evenly to form a powder to obtain component B; mix component A and component B at a weight ratio of 1:1.7, add to a high-speed kneader, heat to 90°C and stir for 25 minutes to obtain this ecological sediment agent. The precipitating agent is added to the sewage according to 0.5% of the mass of the required pre-treated water, and then the treatment of the sewage is completed through processes such as stirring, flocculation, adsorption, algae killing, and precipitation separation. the

The water quality after treatment is: SS is 64.2mg/L, CODcr is 249mg/L, chromaticity is 13, and the removal rates are 93.9%, 94.8%, and 86.5%, respectively. the

Example 3

For the wastewater from a paper mill, the main indicators of the water quality before treatment are: SS is 1067mg/L, CODcr is 4800mg/L, and the chroma is 96. the

The preparation steps of the ecological precipitant used are as follows: first, according to the percentage by weight, 50% of reeds, 40% of water hyacinth and 20% of lotus leaves are broken and stirred, soaked in deionized water for 15 days, and 30% of the concentrated solution is extracted , to prepare component A; then mix vermiculite and diatomaceous earth in a ratio of 2: 1 by weight, grind to 450 mesh at a temperature of 150-350° C., and then mix in activated carbon of the same mass and the same level of particles, and Stir evenly to form a powder to obtain component B; mix component A and component B at a weight ratio of 1:2, add to a high-speed kneader, heat to 90°C and stir for 30 minutes to obtain this ecological sediment agent. The ecological precipitant is added to the sewage according to 0.3% of the required pretreatment water quantity and quality, and then the sewage treatment is completed through processes such as stirring, flocculation, adsorption, algae killing, and precipitation separation. the

The water quality after treatment is: SS is 42.7mg/L, CODcr is 167mg/L, chromaticity is 12, and the removal rates are 95.9%, 96.5%, and 87.5%, respectively. the

Through theoretical analysis and a large number of simulation experiments, it can be concluded that the use of this ecological precipitant can achieve good pretreatment effects. the

Claims (1)

1. ecological precipitation agent; Be used for combined artificial wetland sewage purification pre-treatment; It is characterized in that: by ratio of weight and number is that 1: 1.4～2 component A and B component are formed; Said A component contains 40-50wt% reed, 30-40wt% Herba Eichhorniae and 15-25wt% lotus leaf, and said B component is that 1: 2: 3 zeyssatite, vermiculite, activated carbon formed by ratio of weight and number;

The preparation method of described ecological precipitation agent is: prepare component A and B component respectively, the preparation method of component A soaked 10-15 days with deionized water for reed, Herba Eichhorniae and lotus leaf are smashed stirring, soak solution was concentrated again, and concentration is 30wt%;

The preparation method of B component is for taking by weighing zeyssatite and vermiculite in 1: 2 by ratio of weight and the number of copies; Mix; Under 150-350 ℃ of temperature, be ground to 350～450 orders, and then the equal rank particulate of quality activated carbon such as sneak into, at last three's mixture is put into stirrer and evenly stir and form powder;

Obtained component A and B component 1: 1.4 by ratio of weight and the number of copies～2 are joined in the high speed kneader, be heated to 50-90 ℃, stirred 20-30 minute;

Ecological precipitation agent add-on is 0.2～0.65% of a sewage weight, mixes fully after the input.