CN104828928A - Preparation method of filtering material of nitrogen and phosphorus removal bio-filter tank - Google Patents

Abstract

The invention relates to a preparation method of a filter material for a nitrogen and phosphorus removal biological filter. First crush steel slag, iron filings and zeolite, then measure steel powder according to mass percentage: iron powder: zeolite powder: activated carbon: cement=45%: 10%: 20%: 10%: 15%, and mix to obtain ingredients; Sprinkle plastic hollow floating balls with a diameter of 10mm in the coating machine, sprinkle the ingredients while spraying water, and obtain the wrapped filter material; put the wrapped filter material in the natural curing room, 15 ° C ~ 25 ° C and The relative humidity is 40% to 60% and maintained for 7 to 10 days, and the nitrogen and phosphorus removal biofilter filter material is prepared; the production cost of the invention is low, and it is suitable for large-scale production. The effect of nitrogen and phosphorus removal in domestic sewage is good, and it is not easy to Blockage, not easily affected by temperature, can be widely used in low-concentration domestic sewage or rural decentralized domestic sewage treatment and achieve simultaneous nitrogen and phosphorus removal effects.

Description

A kind of preparation method of nitrogen and phosphorus removal biological filter material

technical field

The invention relates to a method for preparing a nitrogen and phosphorus removal biological filter material, in particular to a method for preparing a nitrogen and phosphorus removal biological filter material by using steel slag powder, iron powder, cement, activated carbon, zeolite powder and the like. the

Background technique

As a conventional wastewater treatment process, the biological filter fully draws on the design ideas of the contact oxidation method of wastewater treatment and the rapid filtration of feed water. The biological filter integrates the characteristics of aeration, high filtration rate, interception of suspended solids, and regular backwashing. It is easy to operate, low in energy consumption, and strong in shock load resistance. This technology has been widely promoted and applied in the world. With the fixed filter material filled in the biological filter as the carrier, a large number of biofilms grow on the surface of the filter material. When the water to be treated flows through, the biological metabolism of microorganisms on the biofilm, bioflocculation, physical adsorption and interception of biofilm and fillers, and the graded predation of the food chain along the direction of water flow in the reactor are fully utilized to achieve efficient removal of pollutants. At the same time, the existence of aerobic and anoxic regions in the biological filter is used to realize the function of nitrogen and phosphorus removal. the

The choice of filter material is the key to the success or failure of the biological filter operation. On the one hand, as a microbial habitat, the filter material affects the amount of biomass in the system, as well as the performance and treatment efficiency of the biofilter. On the other hand, the choice of filler is also directly related to the economic cost of the treatment system. Generally speaking, the selection principles of fillers mainly include: high strength, good chemical and biological stability, insoluble harmful substances, easy biofilm attachment, harmless to attached microorganisms, no inhibition, large specific surface area, large void ratio, Durable, cheap and easy to obtain, convenient to transport, store and install. Such a filter material is conducive to the mass transfer process of microbial film formation and microbial metabolism and the mass transfer of metabolic waste, thereby improving the efficiency of sewage treatment. the

Common filter media mainly include zeolite, ceramsite, coke, quartz sand, activated carbon, expanded spherical clay, expanded shale, styrene, polyethylene, etc. At present, a variety of new filter materials have been developed in the domestic wastewater biological treatment process, but the existing filter materials have their own weaknesses in terms of physical characteristics and biofilm adhesion performance. They are either not strong enough, easily damaged, or have a smooth surface. 1. It is difficult for microorganisms to hang membranes, or the density is high, easy to harden, or expensive, difficult to regenerate, and the filter materials currently used hardly have the characteristics of intensifying microbial activity, and the effect of nitrogen and phosphorus removal is poor. Therefore, it is of great significance to develop a new type of biofilter filter material and improve the filter material shortage for improving the operation effect of the biofilter. the

Contents of the invention

The present invention aims at providing a method for preparing a biofilter filter material that can be used in a biofilter and can improve the operating effect of the biofilter, aiming at the problems of poor denitrification and phosphorus removal effects of the commonly used biofilter filter materials at present. the

The preparation process of the nitrogen and phosphorus removal biological filter material is as follows:

A. Place steel slag and iron filings in a ball mill for grinding, pass through a 400-mesh sieve, and sieve to obtain steel powder and iron powder;

The zeolite is crushed by a jaw crusher and a pair of rollers, and then passed through an 80-mesh sieve to obtain zeolite powder. the

B. Measure steel slag powder: iron powder: zeolite powder: activated carbon: cement = 45%: 10%: 20%: 10%: 15% according to mass percentage, and mix them evenly to obtain ingredients. the

C. Sprinkle plastic hollow floating balls (diameter 10mm) into the coating machine, spray water evenly to moisten the surface; then sprinkle the evenly mixed ingredients in B, start the coating machine, and coat the ingredients on the plastic hollow floating balls. On the ball, agglomerate into moist spherical particles to obtain a wrapped filter material. the

D. Put the wrapped filter material in the natural curing room, control the temperature in the curing room at 15°C to 25°C, and the relative humidity at 40% to 60%, and discharge the material after curing for 7 to 10 days to prepare nitrogen and phosphorus removal organisms filter material. the

The above step C to start the coating machine is to adjust the inclination angle of the drum of the coating machine to 15°, the rotating speed is 50r/min, and sprinkle the ingredients while spraying water while the coating machine is rotating;

The cement model used as the binder in the above step B is No. 325 slag portland cement. the

When steel slag and iron filings are respectively placed in the ball mill in the above step A, the loading of steel slag and iron filings must not exceed two-thirds of the volume of the ball mill tank of the ball mill. the

When the steel slag and iron filings are placed in the ball mill in the above step A, weigh the grinding jars of the ball mill so that the weights of the two grinding jars are the same; start the ball mill, start grinding, run at high speed for 2 minutes, then adjust to low Rotating speed, and then grind for 2 minutes to finish, and the ground materials are passed through a 400 mesh sieve respectively to obtain iron powder and steel powder;

The biofilter filter material prepared by the present invention has the following characteristics:

1. Since the filter material of the present invention is prepared by using steel slag powder, iron powder, zeolite powder, activated carbon, and cement, and its particle size is adjusted according to the requirements for nitrogen and phosphorus removal, the prepared biological filter filter material has a denitrification and phosphorus removal effect Well, make the indicators of the effluent reach the national first-class A standard. the

2. The surface of the filter material of the present invention is rough and porous, the material is non-toxic, non-glazed, easy for microorganisms to grow, and has good synchronous nitrogen and phosphorus removal effects. the

3. The filter material of the present invention has good hydrophilicity, and can be used to treat low-concentration domestic sewage or rural domestic sewage, which can effectively overcome the problems of low nitrogen and phosphorus removal efficiency of traditional biological filters, the influence of suspended solids and the problems of easy blockage of filters , which is conducive to improving the treatment efficiency of the biological filter. the

4. The preparation method of the present invention is simple and convenient, the preparation cost is low, and it is suitable for popularization and application. the

Description of drawings

Fig. 1 is a schematic flow chart of the present invention. the

Detailed ways

Example 1

A. Put steel slag and iron filings in a ball mill respectively, grind them, pass through a 400-mesh sieve, and sieve to obtain steel powder and iron powder with a particle size less than 400 mesh. the

The zeolite is crushed by a jaw crusher and a pair of rollers, and then passed through an 80-mesh sieve (about 0.2mm in diameter) to obtain zeolite powder. the

B. Measure steel slag powder according to mass percentage: iron powder: zeolite powder: activated carbon: cement=45:10:20:10:15%, mix them evenly to obtain ingredients. the

C. Sprinkle plastic hollow floating balls (diameter 10mm) produced by Jiangxi Yiyuan Industrial Co., Ltd. into the KF-02 coating machine, spray water evenly to moisten the surface; then sprinkle the ingredients mixed evenly in B , Start the coating machine, so that the ingredients are coated on the plastic hollow floating balls, agglomerated into moist spherical particles, and the wrapped filter material is obtained. the

D. Put the wrapped filter material in the natural curing room, control the temperature in the curing room at 15°C to 25°C, and the relative humidity at 40% to 60%, and discharge the material after curing for 7 to 10 days to prepare nitrogen and phosphorus removal organisms filter material. the

Above-mentioned starting coating machine is: the drum inclination angle of coating machine is adjusted to 15 °, and rotating speed is 50r/min, while coating machine rotates, sprinkle batching while spraying water. the

The cement model as binder in the batching of above-mentioned B step is No. 325 slag Portland cement. the

Example 2

The nitrogen and phosphorus removal biological filter material prepared in Example 1 was used in a two-stage biological filter for a feasibility trial operation, and the sewage of a domestic sewage treatment plant was treated to investigate its nitrogen and phosphorus removal effect. the

The domestic sewage of a sewage treatment plant is taken as the influent of this process, and the hydraulic retention time of the process is controlled to be 6h, the gas-water ratio is 20:1, and the reflux ratio is 50%. After the process runs for a period of time, the removal rates of COD, ammonia nitrogen, total phosphorus and total nitrogen are as follows:

project COD/mg·L-1 Ammonia nitrogen/mg·L-1 Total phosphorus/mg·L-1 Total nitrogen/mg·L ^-1 flooded 180 20 2.6 21.5 out of water 12 0 0.028 4.3 Removal rate/% 93 100 98.8 80

It can be seen from the table that COD, ammonia nitrogen, total nitrogen, and total phosphorus can all meet the first-class A standard of GB18918-2002, and the removal rates of total nitrogen and total phosphorus are as high as 93%, 98.8%, and 80% respectively, and the effluent is clear and transparent. Therefore, the nitrogen and phosphorus removal biological filter material prepared by the present invention can achieve the effect of simultaneous nitrogen and phosphorus removal. the

Claims (3)

1. A preparation method for nitrogen and phosphorus removal biological filter material, characterized in that: A. Steel slag and iron filings are respectively placed in a ball mill for grinding, passed through a 400-mesh sieve, and sieved to obtain steel powder and iron powder; The zeolite is crushed by a jaw crusher and a pair of rollers, and then passed through an 80-mesh sieve to obtain zeolite powder; B. Measure steel powder according to mass percentage: iron powder: zeolite powder: activated carbon: cement=45%: 10%: 20%: 10%: 15%, mix them evenly to obtain ingredients; C. Sprinkle plastic hollow floating balls with a diameter of 10mm into the coating machine, spray water evenly to moisten the surface; then sprinkle the ingredients obtained in step B, start the coating machine, and coat the ingredients in step B on the plastic On the hollow floating ball, agglomerate into moist spherical particles to obtain the wrapped filter material; D. Put the wrapped filter material in the natural curing room, control the temperature in the curing room at 15°C to 25°C, and the relative humidity at 40% to 60%, and discharge the material after curing for 7 to 10 days, and then the denitrification and phosphorus removal is prepared. Biofilter media; Above-mentioned C step starts coating machine is to make the cylinder inclination angle of coating machine be 15 °, and rotating speed is 50r/min, while spraying water while coating machine rotates, spread ingredients; The cement used as binder in the above-mentioned B step is No. 325 slag portland cement. 2. the preparation method of a kind of denitrification and dephosphorization biological filter according to claim 1 is characterized in that: when steel slag and iron filings are respectively placed in the ball mill in step A, steel slag and iron filings cannot be charged. More than two-thirds of the volume of the ball mill tank. 3. the preparation method of a kind of denitrification and dephosphorization biological filter tank filter material according to claim 1, is characterized in that: when steel slag, iron filings are respectively placed in ball mill and grind in step A, first weigh the grinding of ball mill tank, so that the weight of the two grinding tanks is the same, then start the ball mill, start grinding, run at high speed for 2 minutes, then adjust to low speed, and grind for another 2 minutes, and finish, pass the ground materials through 400 mesh sieves respectively, Obtain iron powder and steel powder.