KR100597662B1 - Manufacturing Method of Waster Compound Stony Pellet for removing nitrogen and phosphorus, Using of Wasted sludge - Google Patents

Abstract

The present invention relates to a method for producing nitrogen and phosphorus removal adsorbent using sludge, and more particularly, to a method for preparing nitrogen and phosphorus removal adsorbent using waste synthetic resin and sludge.

An object of the present invention is to provide a method for producing an adsorbent for removing nitrogen and phosphorus using waste synthetic resin and sludge generated after water treatment or sludge generated after sewage treatment.

The method for preparing the adsorbent for removing nitrogen and phosphorus of the present invention comprises the steps of melting after mixing 60 to 90% by weight of waste synthetic resin and 10 to 40% by weight of sludge;

Adding foaming agent to 2.0 weight% to 6.0 weight% with respect to 100 weight% of the mixture of waste synthetic resin and sludge, followed by mixing and foaming;

Extruding the mixture of foamed waste synthetic resin and sludge in the previous step.

Description

Manufacturing Method of Waster Compound Stony Pellet for removing nitrogen and phosphorus, Using of Wasted sludge             

1 is a graph showing the nitrogen removal effect of sewage, wastewater and livestock wastewater using the adsorbent prepared according to the present invention.

Figure 2 is a graph showing the effect of removing municipal sewage, wastewater and livestock wastewater using the adsorbent prepared by the present invention.

The present invention relates to a method for producing nitrogen and phosphorus removal adsorbent using sludge, and more particularly, to a method for preparing nitrogen and phosphorus removal adsorbent using waste synthetic resin and sludge.

Due to industrial development and population growth, the generation of various kinds of wastewater is increasing. Wastewater that causes eutrophication such as nitrogen and phosphorus in various wastewaters not only contaminates water resources, but also contaminates marine products near the sea, causing enormous damage to related industries. In particular, these days, eutrophication is frequently occurring due to the high temperature of the earth, so people are always paying attention to whether or not eutrophication occurs.

Water pollution prevention devices are mandated to operate in a building of a certain size or more to suppress the release of eutrophication substances such as nitrogen and phosphorus.In this case, operating costs are high, and in small buildings of a certain size or less, water pollution prevention devices are required. Since there is no mandatory operation, water pollution is not well reduced.

Therefore, small-scale water pollution prevention devices available to livestock farms and small factories or adsorbents to remove nitrogen and phosphorus should be supplied at low cost, rather than large-scale water pollution prevention devices. There is a shortage of supplies.

Currently, research on phosphorus removal carriers using waste to remove nitrogen and phosphorus to promote eutrophication of industrial wastewater at low cost, and a method for producing the same are being conducted. Also, coal ash is used to adsorb harmful substances such as heavy metals. Zeolite synthesis research and adsorption characteristics of heavy metals by waste oyster shell are being studied.

However, there is a shortage of supply of adsorbents capable of removing nitrogen and phosphorus, which are satisfactory for operating costs.

 The present invention has been made to solve the above-mentioned problems, sludge generated after the waste synthetic resin and water treatment, sludge generated after sewage treatment, sludge generated after industrial wastewater treatment, generated after acid treatment of metal An object of the present invention is to provide a method for preparing an adsorbent for nitrogen and phosphorus removal using any sludge selected from the sludge or using two or more sludge mixtures.

The present invention is selected from waste synthetic resin and sludge generated after water treatment, sludge generated after sewage treatment, sludge generated after industrial wastewater treatment, sludge generated after acid treatment of metals in the manufacture of adsorbent for nitrogen and phosphorus removal. Since either sludge or two or more sludge mixtures are used as materials, it not only helps to solve environmental problems, but also requires a small raw material cost, so that an adsorbent for nitrogen and phosphorus removal can be manufactured at a low cost.

In order to achieve the above-mentioned object, the method for preparing an adsorbent for removing nitrogen and phosphorus of the present invention comprises melting 60 to 90% by weight of waste synthetic resin and 10 to 40% by weight of sludge, followed by melting;

Adding foaming agent to 2.0 weight% to 6.0 weight% with respect to 100 weight% of the mixture of waste synthetic resin and sludge, followed by mixing and foaming;

And extruding the mixture of foamed waste synthetic resin and the subsidiary material in the previous step.

In the present invention, the waste synthetic resin can be used waste vinyl and waste plastic, respectively, or a mixture of these in a ratio of 1: 9 to 9: 1. In the present invention, when the waste synthetic resin is used in the manufacture of the adsorbent, the strength of the adsorbent is reduced, and when used in excess of 90% by weight, the adsorption of nitrogen and phosphorus is lowered. It is preferable to use -90 wt%.

In the present invention, waste vinyl containing polyvinyl may be used as one example of waste vinyl in the waste synthetic resin, and as one example of waste plastic, plastic made of polyethylene or polypropylene may be used.

In the present invention, the sludge uses any one selected from sludge generated after water treatment, sludge generated after sewage treatment, sludge generated after industrial wastewater treatment, sludge generated after acid treatment of metal, or two or more sludges. Sludge mixtures may be used (hereinafter referred to as sludge from water treatment, sludge from sewage treatment, sludge from industrial wastewater treatment, and sludge from acid treatment of metals). In this case, when the two sludge mixtures are applied, the mixed sludge mixture may be applied in a ratio of 1: 9 to 9: 1.

Meanwhile, in the present invention, it is preferable to use sludge containing 10 to 30% by weight of magnesium (Mg). In the present invention, the sludge serves to adsorb nitrogen and phosphorus. In particular, since magnesium acts to agglomerate nitrogen and phosphorus with each other, it is preferable to use sludge containing 10 to 30% by weight of magnesium. If the magnesium content of the sludge is less than 10% by weight, the sludge may be added as much as the magnesium content.

If the content of magnesium (Mg) in the sludge is less than 10% by weight it is difficult to agglomerate nitrogen and phosphorus in the adsorbent, when the content of more than 30% by weight will reduce the content of sludge adsorbing nitrogen phosphorus. Therefore, it is better to use sludge containing 10 to 30% by weight of magnesium.

On the other hand, in the present invention, the sludge may use a particle size of 100 to 200 mesh. In the present invention, if the sludge particle size is less than 100 mesh, there is a problem that the adsorption effect of nitrogen and phosphorus is reduced, and when the sludge particle size exceeds 200 mesh, there is no significant improvement in the adsorption effect of nitrogen and phosphorus, and particles having a small particle size are prepared. There is a problem of increasing energy consumption. Therefore, the particle size of the sludge in the present invention is preferably used to 100 to 200 mesh.

Melting of the waste synthetic resin in the present invention can be carried out under conditions of a predetermined time above the temperature at which the waste synthetic resin can be melted. As an example of such melting conditions in the present invention is carried out for 110 to 300 minutes at 110 to 300 ℃ temperature is 110 ℃, less than 30 minutes the melting time of the waste synthetic resin takes a long time, the temperature is 300 ℃, time 120 If it exceeds minutes, the cost of temperature increase without special difference in melting state of waste synthetic resin is required. Melting condition of waste synthetic resin can be carried out at 110-300 ℃ for 30-120 minutes.

In the present invention, the waste synthetic resin may be melted and then the sludge is added and mixed, followed by adding a blowing agent to foam the mixture of the waste synthetic resin and the sludge. In this case, the blowing agent may use a hard carbon foam or a heavy carbon foam. In the present invention, as an example of such a blowing agent, an ACP (Geumyang, Korea) foaming agent having a decomposition temperature of 120 to 157 ° C in air and a gas amount of 160 to 180 ml / g in air, a decomposition temperature of 125 to 143 ° C in air, and in air Any one selected from JTR (Geumyang, Korea) foaming agents having a gas amount of 160 to 180 ml / g may be added to a mixture of waste synthetic resin and sludge, followed by mixing for 3 to 10 minutes to foam.

In the present invention, the blowing agent may be used 2.0 to 6.0% by weight relative to 100% by weight of the waste synthetic resin and sludge mixture. If the foaming agent is less than 2.0% by weight, it is difficult to obtain a porous adsorbent because it is not porous foamed. If the foaming agent is used in excess of 6.0% by weight, the foaming agent in the present invention is 100% by weight of the waste resin and the sludge mixture. It is better to use 2.0 to 6.0% by weight.

In order to use the mixture of foamed waste resin and subsidiary material foamed by adding foaming agent to the mixture of waste resin and sludge as adsorbent for removing nitrogen and phosphorus, the surface area must be large so that the surface area can be irregularly shaped as a porous body during extrusion. It can be formed in the form. In addition, the adsorbent having various particle sizes may be formed in consideration of the size of the filling device in which the adsorbent is filled.

Hereinafter, the present invention will be described by the following examples and test examples. However, these are only examples of the present invention, and the scope of the present invention is not limited thereto.

<Examples 1-10>

Table 1 The composition and content of polyvinyl, polyethylene, polypropylene waste synthetic resin and the sludge generated after the sewage treatment of Table 1 content (sludge generated in Gwangju Gwangju Sewage Treatment Plant) is injected into the reactor for 40 minutes at 180 ℃ By heating, the waste synthetic resin and the sludge were melted.

ACP blowing agent (Geumyang, South Korea) having a decomposition temperature of 137-143 ° C in air and a gas amount of 160-180 ml / g in air was added to 100% by weight of the mixture of waste synthetic resin and subsidiary materials. It was added in the content of Table 1. The waste synthetic resin, sludge and blowing agent were mixed for 7 minutes to allow foaming, and then a spherical adsorbent (Waster Compound Stony Pellet, WCSP) was prepared to pass through an extruder having a diameter of 5 to 10 mm to a diameter of 5 to 10 mm.

The sludge was 15% by weight of magnesium, and completely dried and then pretreated to have a particle size of 70 mesh. The waste synthetic resin was cut to a length of 10 to 20 mm as a pretreatment pre-melt and melted.

Table 1. Usage of Waste Synthetic Resin, Sludge and Foaming Agent (Unit: wt%)

Item Polyvinyl Polyethylene Polypropylene Sludge blowing agent Example 1 50 20 20 10 6.0 Example 2 48 19 19 13 2.5 Example 3 47 18 18 17 5.2 Example 4 45 18 17 20 2.2 Example 5 44 17 16 23 2.0 Example 6 42 16 15 27 4.6 Example 7 40 15 15 30 4.4 Example 8 39 14 14 33 3.9 Example 9 37 13 13 37 2.8 Example 10 36 12 12 40 3.8

<Test Example 1>

The adsorbents (WCSP) prepared in Examples 1 to 10 were washed 2 to 3 times with distilled water and then dried. After washing, 470-630 g of each dry sorbent (WCSP) was put into 10 3.0 L batch reactors, and 1.0 L of a mixture of sewage, wastewater, and livestock waste water was introduced into a batch reactor filled with each adsorbent at 1 hour intervals. The wastewater mixture sample treated water that passed through the adsorbent was analyzed and water temperature and pH were measured. As a result, the water temperature of the wastewater mixture sample treated water which passed the adsorbents prepared by Examples 1-10 was 20 +/- 6 degreeC, and the pH obtained the measurement result about 6-8.

The water temperature and pH analysis of the wastewater mixture sample treated water that passed through the adsorbent in this test example was measured using an analyzer (pH / mV meter ORion Researchinc Model 290A, USA).

<Test Example 2>

The adsorbent (WCSP) prepared in Example 7 was washed 2-3 times with distilled water and then dried. After washing, 470-630 g of dry adsorbent (WCSP) was put in a 3.0L batch reactor, 1.0L of livestock wastewater containing 88.34mg / L of nitrogen was introduced into the reactor at an interval of 1 hour for 8 hours, and then treated water. To analyze the nitrogen removal efficiency was measured and the results are shown in FIG.

The removal efficiency of nitrogen contained in the treated water was measured by the absorbance method of the water pollution test method in Korea, and analyzed by using an ultraviolet absorbance photometer (UV-Spectro meter Model UV-2101-OC, SHIMAZU). .

<Test Example 3>

The adsorbent (WCSP) prepared in Example 7 was washed 2-3 times with distilled water and then dried. After washing, 470-630 g of dry adsorbent (WCSP) was put in a 3.0 L batch reactor, 1.0 L of livestock wastewater containing 88.34 mg / L of phosphorus was introduced into the reactor at an interval of 1 hour for 8 hours, and then treated water. Analyze to measure the removal efficiency of phosphorus and the results are shown in FIG.

The removal efficiency of nitrogen contained in the treated water was measured by the absorbance method of the water pollution test method in Korea, and analyzed by using an ultraviolet absorbance photometer (UV-Spectro meter Model UV-2101-OC, SHIMAZU). .

The waste synthetic resin of the present invention and sludge generated after water treatment, sludge generated after sewage treatment, sludge generated after industrial wastewater treatment, sludge generated after acid treatment of metal, or two It can be seen that the nitrogen and phosphorus removal adsorbents prepared using the above sludge mixture (Waster Compound Stony Pellet, WCSP) have an excellent effect on nitrogen and phosphorus removal. In particular, it can be seen that the removal efficiency of phosphorus is higher than that of nitrogen.

In the present invention, wastes such as waste synthetic resin and sludge are reused in the manufacture of adsorbents for nitrogen and phosphorus removal, thereby not only reducing economic losses but also contributing to environmental conservation, and reducing raw material costs. An adsorbent for phosphorus removal can be prepared.

Claims (7)

Waste plastics containing polyvinyl, polyethylene or polypropylene are used, respectively, or 60 to 90% by weight of waste synthetic resin of waste vinyl and waste plastic mixture, sludge generated after water treatment, sludge generated after sewage treatment , Sludge generated after industrial wastewater treatment, sludge generated after acid treatment of metals, or 10 to 40% by weight of two or more sludge mixtures are mixed and mixed at 110 to 300 ° C. Melting for ˜120 minutes, Adding 2.0 to 6.0% by weight of a hard coal-based foaming agent or a bicarbonate-based blowing agent with respect to 100% by weight of the mixture of the molten waste synthetic resin and sludge, followed by mixing for 3 to 10 minutes and foaming; A method of producing a sludge-containing adsorbent for nitrogen and phosphorus removal comprising the step of extruding a mixture of waste synthetic resin and sludge foamed in the previous step through an extruder having a diameter of 5 to 10mm. delete delete The method of claim 1, wherein the sludge contains 10 to 30% by weight of magnesium (Mg). delete delete An adsorbent for nitrogen and phosphorus removal produced by the method of claim 1.

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