CN105642221A - Phosphorus removal water purifying agent and preparation method thereof - Google Patents

Abstract

The invention relates to a phosphorus-removing water purifying agent and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 50 to 60 parts of aluminum sludge from a water supply plant with a particle size of less than 0.15 mm, and a particle size of less than 0.15 mm 35 to 45 parts of the remaining activated sludge in the mm sewage plant, and 5 parts of the binder clay; the above raw materials are weighed according to the proportion and mixed evenly, and water is added during the mixing process, and the moisture content of the wet basis is controlled at 18% to 25%. After mixing, the mixture is obtained; the above mixture is made into sludge particles with a particle size of 0.5mm to 1.5mm, and then the sludge particles are dried at a drying temperature of 100°C to 110°C, and dried sludge particles are obtained after drying; The above-mentioned dried sludge particles are baked at 300°C to 900°C for 10min to 60min to finally obtain phosphorus-removed modified sludge; avoiding the harm to the environment caused by the sludge treatment method, saving the cost of waste treatment in water plants, low cost, Simple operation and environmental protection.

Description

A kind of phosphorus removal water purification agent and preparation method thereof

technical field

The invention relates to the field of water purification, in particular to a method for treating phosphorus-containing waste water with light porous water purification materials prepared from urban water supply plant sludge and sewage plant sludge as main raw materials, in particular to a phosphorus-removing water purifying agent and its preparation method.

Background technique

Conventional drinking water treatment technology generally adopts coagulation, sedimentation, and filtration processes, and the coagulation unit plays a vital role in the entire treatment process. In recent years, low-molecular aluminum sulfate and ferric chloride have been gradually replaced by new aluminum salt coagulants represented by high-molecular polyaluminum chloride. A large amount of sludge is produced in the process of water purification, mainly from sedimentation tank discharge water and Filter backwash drain. At present, the annual output of dewatered sludge (with a moisture content of 70%) in urban water plants across the country is close to 22 million tons. It is estimated that by the end of 2015, the annual output of dewatered sludge in my country will exceed 26 million tons. According to the data in 2010, the No. The annual output of mud cake (moisture content 70%) is about 6,000 tons, so the reasonable disposal of a large amount of sludge has become an urgent problem to be solved at home and abroad. Dehydrated aluminum sludge is a by-product of the water purification process in waterworks, and its main components include humus, metal hydroxides, organic matter, silicate, etc.

Domestic sewage plant sludge is a general term for various sediments and floating objects produced in different treatment processes in urban domestic sewage treatment. At present, the annual growth rate of the amount of sludge discharged by domestic sewage treatment plants in my country is greater than 10%. Based on a solid content of 20%, the total annual sludge output in the country has exceeded 30 million tons. The total output of sludge will exceed 60 million tons. Sewage plants produce a large amount of sludge and contain a large number of microorganisms, pathogens and organic pollutants. Reasonable treatment and disposal of sludge is a very important task.

If the sludge from these water supply plants and sewage plants is directly discharged into the water body without treatment, it will not only seriously pollute the water body, but also waste a lot of water resources. It is imperative to treat the sludge from waterworks plants and sewage plant. The existing sludge treatment methods include direct discharge, land disposal, sanitary landfill, ocean disposal, land use and incineration, etc. However, these methods more or less all bring a certain degree of pollution to the environment. Most of the current treatment methods for water supply plant sludge and sewage plant sludge do not use it as a resource.

At present, my country's water pollution is still serious. An important problem in lakes (reservoirs) is eutrophication. The main pollution indexes are total nitrogen and total phosphorus, of which phosphorus is a controlling factor. The problem of eutrophication in lakes is very prominent. There are also many kinds of phosphorus removal technologies, mainly three methods: chemical phosphorus removal, biological phosphorus removal, and physical phosphorus removal. Among them, chemical phosphorus removal or chemical-assisted biological phosphorus removal are widely used. The efficiency of chemical phosphorus removal is reliable, and the control process of phosphorus removal is relatively simple, but it needs to add chemical agents, which is expensive, and a large amount of sludge will be generated during the treatment process, and the disposal cost is high. Biological phosphorus removal relies on microorganisms such as phosphorus accumulating bacteria to purify phosphorus in water bodies, and is operated as a process for sewage treatment in sewage treatment plants. Biological phosphorus removal does not require additional chemicals, and the cost is relatively low. Other processes in the sewage treatment process can be used to remove nitrogen and BOD. However, microorganisms are highly sensitive to the environment, and microorganisms need to be strictly controlled during operation. growth conditions, thus limiting the stability of the entire sewage phosphorus removal process and treatment effect.

Using sludge from sewage plants and water supply plants to prepare water purification materials to purify phosphorus-containing water supply is economical, effective, simple and practical, and can turn waste into wealth and avoid secondary pollution.

Therefore, the production of an energy-saving and environmental-friendly, resource-saving, low-cost, high-efficiency adsorption capacity, no regeneration waste, strong stability, simple processing and preparation methods for phosphorus removal water purifiers and preparation methods thereof has broad market prospects.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an energy-saving and environment-friendly, resource-saving, low-cost, high-efficiency adsorption capacity, no regeneration waste, strong stability, simple processing and preparation methods, and a preparation method thereof for phosphorus removal and water purification. It is used to make up for the defects in the prior art.

The technical solution of the present invention is achieved in the following way: a phosphorus removal water purifying agent, which is prepared from the following raw materials in parts by weight: 50 to 60 parts of aluminum sludge from a water supply plant with a particle diameter of less than 0.15 mm, and The diameter is less than 0.15mm sewage plant remaining activated sludge 35 to 45 parts, binder clay 5 parts.

A kind of preparation method of phosphorus removal water purifying agent as above, its preparation method is as follows:

1) Weigh the above raw materials according to the proportion and mix them evenly, add water during the mixing process, control the moisture content of the wet basis at 18% to 25%, and obtain the mixture after mixing;

2) Make the above mixture into sludge particles with a particle size of 0.5mm to 1.5mm, then dry the sludge particles at a drying temperature of 100°C to 110°C, and obtain dried sludge particles after drying;

3) The above-mentioned dried sludge particles are baked at 300°C to 900°C for 10min to 60min to finally obtain phosphorus-removed modified sludge.

The sludge from the water supply plant comes from the water supply plant to obtain dewatered sludge after dewatering the sludge in the sedimentation tank and filter backwashing process with polyaluminum chloride flocculant, polyferric sulfate, iron and aluminum as the main coagulant .

The residual activated sludge of the sewage plant is the sludge of the domestic sewage plant, and the organic matter content of the sludge is not less than 65%.

The present invention has the following positive effects: the present invention uses water supply plant sludge and domestic sewage plant sludge as main raw materials for mixing, granulating, and roasting to prepare light-weight phosphorus-removing adsorption materials. Compared with the prior art, the present invention will Plant sludge and sewage plant sludge are ground and sieved, mixed with binder and baked at high temperature. A large amount of organic matter in domestic sewage plant sludge can be carbonized at high temperature, which enhances the porosity and porosity of high-temperature modified sludge. High, increasing the surface area of sludge in contact with phosphorus-containing compounds, which is conducive to the removal of phosphorus-containing compounds in water by sludge, and the adsorption effect on phosphorus is more ideal. It can efficiently adsorb phosphorus-containing compounds in eutrophic water bodies and play a role in water purification. The effect of water body environment is significantly improved; the present invention rationally utilizes water supply plant sludge and domestic sewage plant sludge, and avoids sludge treatment methods such as direct discharge, land burial, sanitary landfill, marine abandonment and land use. The harm caused by the environment saves the cost of waste treatment in water plants. Compared with other water body phosphorus removal methods, the raw materials used in the present invention are simple and easy to obtain, the price is low, the production principle is simple, and it has the advantages of low cost, simple operation, and environmental protection. Great prospects for promotion.

detailed description

A phosphorus-removing water purifier, which is prepared from the following raw materials in parts by weight: 50 to 60 parts of aluminum sludge from water supply plants with a particle size of less than 0.15 mm, and residual activated sludge from sewage plants with a particle size of less than 0.15 mm 35 to 45 parts, 5 parts of binder clay. The sludge from the water supply plant comes from the water supply plant to obtain dewatered sludge after dewatering the sludge in the sedimentation tank and filter backwashing process with polyaluminum chloride flocculant, polyferric sulfate, iron and aluminum as the main coagulant . The residual activated sludge of the sewage plant is the sludge of the domestic sewage plant, and the organic matter content of the sludge is not less than 65%.

A kind of preparation method of phosphorus removal water purifying agent as above, its preparation method is as follows:

1) Weigh the above raw materials according to the proportion and mix them evenly, add water during the mixing process, control the moisture content of the wet basis at 18% to 25%, and obtain the mixture after mixing;

2) Make the above mixture into sludge particles with a particle size of 0.5mm to 1.5mm, then dry the sludge particles at a drying temperature of 100°C to 110°C, and obtain dried sludge particles after drying;

3) The above-mentioned dried sludge particles are baked at 300°C to 900°C for 10min to 60min to finally obtain phosphorus-removed modified sludge.

Example 1: 60 parts of water supply plant sludge, 35 parts of domestic sewage plant sludge and 5 parts of clay were used as raw materials.

The preparation method is as follows: the sludge from the water supply plant is dried, crushed, and used after sieving; the sludge from the domestic sewage plant is dried, crushed, and sieved before being used; the sludge from the water supply plant, the sludge from the sewage plant, and the clay are stirred in a mixer for 10 minutes, and then added with water , so that the moisture content of the wet basis is 21%, stir evenly, make sludge particles with a particle size of 0.5mm to 1.5mm, dry at 105°C for 1 hour, and bake at 700°C for 30 minutes to obtain the product light phosphorus removal adsorption material.

In this example, to test the material performance of the product, add a certain amount of high-temperature modified sludge and simulated sewage into the beaker, the total phosphorus concentration in the sewage is 2mg/L, the use solution is 1L, and the dosage of the adsorbent is 10g . Through the full contact of mud and water, the removal rate of phosphorus is 95%, and the effluent is 0.18mg/L.

Embodiment 2: raw material adopts 55 parts of water supply plant sludge, 40 parts of domestic sewage plant sludge, 5 parts of clay,

The preparation method is to crush and sieve the water supply plant sludge; use the domestic sewage plant sludge after crushing and sieving; stir the water supply plant sludge, sewage plant sludge, and clay in a mixer for 10 minutes, add water, and make the wet basis The moisture content is 18%, and after stirring evenly, it is made into sludge particles with a particle size of 0.5mm to 1.5mm, dried at 105°C for 1 hour, and baked at 800°C for 20 minutes to obtain the product light phosphorus removal adsorption material.

In this example, to test the material performance of the product, add a certain amount of high-temperature modified sludge and simulated sewage into the beaker, the total phosphorus concentration in the sewage is 3mg/L, the use solution is 1L, and the dosage of the adsorbent is 10g . Through the full contact of mud and water, the removal rate of phosphorus is 90%, and the effluent is 0.3mg/L.

Embodiment 3: 50 parts of water supply plant sludge, 45 parts of domestic sewage plant sludge, and 5 parts of clay are used as raw materials. The preparation method is to crush water supply plant sludge and use after screening; use after domestic sewage plant sludge is crushed and sieved,

Stir water supply plant sludge, sewage plant sludge, and clay in a mixer for 10 minutes, add water to make the moisture content of the wet basis 23%, and mix well to make sludge particles with a particle size of 0.5mm to 1.5mm, 105 ℃ drying for 1 hour, 650 ℃ baking for 20 minutes. The product light phosphorus removal adsorption material is obtained.

In this example, to test the material performance of the product, add a certain amount of high-temperature modified sludge and simulated sewage into the beaker, the total phosphorus concentration in the sewage is 3mg/L, the use solution is 1L, and the dosage of the adsorbent is 10g . Through the full contact of mud and water, the effluent is 0.32mg/L.

Claims (4)

1. a dephosphorization water purification agent, it is characterized in that, it is prepared from by the raw material of following weight part number: particle diameter is less than 50 parts to 60 parts, the water supply plant aluminium mud of 0.15mm, and particle diameter is less than 0.15mm Sewage Plant residual active sludge 35 parts to 45 parts, binding agent clay 5 parts.

2. the preparation method of a dephosphorization water purification agent as claimed in claim 1, it is characterised in that, its preparation method is as follows:

1) mixing after being weighed according to proportioning by above-mentioned raw materials, add moisture in mixing process, wet base moisture control, 18% to 25%, obtains compound after mixing;

2) above-mentioned compound being made the mud granule that particle diameter is 0.5mm to 1.5mm, then that mud granule is dry, drying temperature is 100 DEG C to 110 DEG C, obtains sludge-drying particle after dry;

3) above-mentioned sludge-drying particle is cured 10min to 60min at 300 DEG C at 900 DEG C, finally obtain the modified sewage sludge of dephosphorization.

3. dephosphorization water purification agent according to claim 1, it is characterised in that: described waterworks sludge makes flocculant of polymeric aluminium chloride, bodied ferric sulfate and iron, aluminium be obtain dewatered sludge after the sludge dewatering in settling tank and filter tank recoil process of the coagulating agent of main body from water supply plant.

4. dephosphorization water purification agent according to claim 1, it is characterised in that: described Sewage Plant residual active sludge is the mud of domestic sewage factory, and this mud organic substance content is not less than 65%.