CN111925006A

CN111925006A - COD degradationcrDecolorizing filter material

Info

Publication number: CN111925006A
Application number: CN202010702937.9A
Authority: CN
Inventors: 朱正培; 王汉勤
Original assignee: WUXI JIANGNAN WATER SUPPLY AND DEWATERING EQUIPMENT CO Ltd
Current assignee: WUXI JIANGNAN WATER SUPPLY AND DEWATERING EQUIPMENT CO Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-11-13

Abstract

The invention discloses a method for degrading COD_CrThe decolorizing filter material comprises the following components in percentage by weight: 20-25% of Al₂O₃，20‑25％MgO，5‑10％MgCl₂，5‑13％Fe，5‑10％Mo，1‑5％Cu，15‑20％SiO₂，3‑8％CaCO₃10-15% of C. The filter material of the invention has simple manufacture and use, can reduce the CODcr of the sewage by 60-70% within half an hour, has quite low operation cost, has a material operation period of more than one year, and has very obvious economic benefit.

Description

COD degradationCrDecolorizing filter material

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a method for degrading COD (chemical oxygen demand)_CrAnd a decoloration filter material.

Background

In the sewage treatment, the CODcr value of some sewage is large, and the effect of optical methods such as chemical adding, biochemistry and electrolysis is not large.

The application of aluminum and iron salts in water purification is a widely used method, and the application of the aluminum and iron salts has many limitations:

A. the pH value of the sewage is neutral or slightly alkaline;

B. the pollution degree of the sewage is low;

C. the extra capacity is added and not used;

D. the method is not suitable for treating a plurality of sewage with higher difficulty.

In order to overcome the limitation of the chemical treatment of aluminum and iron salts, people in the environmental protection field utilize iron carbon to carry out micro-electrolysis on sewage. Limitations with microelectrolysis:

A. the difficulty of material preparation and use is high;

B. after the aluminum and iron salts are used, the iron-carbon micro-electrolysis treatment is difficult or only used for heavy pollution;

C. the cost is high, the difficulty is high, and the operator is difficult to master.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a low-cost and easy-to-manufacture degraded COD_CrAnd the filter material has a decoloring effect.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

COD degradation_CrThe decolorizing filter material is characterized in that the COD is degraded_CrThe filter material comprises the following components in percentage by weight:

20-25％Al₂O₃，20-25％MgO，5-10％MgCl₂，5-13％Fe，5-10％Mo，1-5％Cu，15-20％SiO₂，3-8％CaCO₃，10-15％C。

in the invention, iron and molybdenum are present in the form of simple metals and/or compounds, the percentage contents being calculated as Fe or Mo.

COD degradation_CrThe decolored sewage treatment device comprises a filter tank, wherein the filter tank is provided with a filter layer, and the decolored sewage treatment device is characterized in that the filter material of the filter layer adopts the COD degradation method_CrA decolorizing filter material.

In a preferred technical solution, the water inlet of the filter tank is arranged at the lower part of the filter tank, and the water outlet is arranged at the upper part of the filter tank.

In one preferred technical scheme, a certain interval is arranged between the filter layer and the bottom of the filter tank, and the bottom of the filter tank is provided with a microporous aeration device.

Reduce sewage COD_CrThe method comprises contacting the sewage with a filter material, and is characterized in that the filter material is the COD degrading filter material as described above_CrAnd (5) filtering the material.

According to one preferable technical scheme, the pH value of the sewage is adjusted to 3-4 and then is contacted with the filtering material.

In one preferred technical scheme, the contact time of the sewage and the filter material is 8-30 minutes, and the contact time can be specifically adjusted according to the property of the sewage.

In one preferred embodiment, the sewage is aerated at the lower part of the filter material while contacting the filter material.

In one preferred technical scheme, after suspended matters and/or dirty oil in the sewage are removed, the pH value of the sewage is adjusted, and then the sewage is contacted with the filtering material.

In one preferable technical scheme, after the sewage is contacted with the filter material, the pH value of the sewage is adjusted to be alkaline, a flocculating agent is added, and scum is removed by air flotation.

The filter material has the characteristics of simple manufacture and use, can reduce the CODcr of sewage by 60-70%, reduce the chroma by more than 90%, take time within half an hour, has quite low operation cost, has the material operation period of more than one year, and has very obvious economic benefit.

Drawings

FIG. 1 is a schematic structural view of a sewage filtration tank of the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail below with reference to preferred embodiments and the accompanying drawings.

Examples 1 to 3

Degradation of COD_CrThe decolorizing filter material comprises the following components in percentage by mass:

serial number	Name (R)	Example 1	Example 2	Example 3
					1	Active Al₂O₃	20	25	20
2	MgO	20	20	25
					3	MgCl₂	5	10	5
4	Fe	13	5	6
					5	Mo	5	6	10
6	Cu	1	1	1
					7	SiO₂	15	15	20
8	CaCO₃	6	8	3
					9	C	15	10	10

Mixing the above components at a certain proportion, adding water, and using magnesium cement (MgO-MgCl)₂Water), adhesive forming, air drying.

The filter material has special micro-electrolysis characteristics under acidic conditions, is superior to other micro-electrolysis materials, and has special effects on breaking and separating high-COD organic matters and high-chroma dye molecular structures.

The cations in the filter material form a water purifying agent under an acidic condition, the water purifying agent coagulates sewage organic matter sump oil to form alum floc, and the alum floc floats upwards and is scraped out of the water surface under an air floatation condition. The whole effects of removing COD and decoloring are embodied.

The raw materials used in this example were all commercially available products.

Examples 4 to 6

COD degradation_CrThe bottom of the filtering tank is provided with a micropore aeration device 2, and the micropore aeration device 2A filter layer 1 is arranged on the upper surface of the filter layer at a certain distance from the bottom, and the filter material of the filter layer 1 adopts the COD degradation method described in the embodiment 1-3_CrA decolorizing filter material.

Sewage enters the filter tank from a water inlet close to the bottom of the filter tank and is degraded by COD_CrAnd after the decoloration filter material is filtered and degraded, the water is discharged from a water outlet at the upper part of the filter tank.

The micropore aeration device adopts a conventional micropore aerator.

Example 7

Reduce sewage COD_CrThe decolorization method comprises the following steps:

(1) the printing and dyeing sewage is pretreated by adopting a general treatment method to remove suspended matters, dirty oil and other matters, so that the sewage becomes slightly clear, namely COD_CrAbout 15% reduction.

(2) After the pH value of the wastewater is adjusted to 3-4, the wastewater enters the filtering tank described in the embodiment 2, and in the filtering tank, the wastewater and the degraded COD are_CrThe decolorizing filter material is contacted and filtered for 10-20 min while the lower microporous aerator is opened to raise the contact effect, COD_CrThe removing rate can reach 60-70%, the filter sediment is hardly generated, the chroma is almost completely eliminated, the pH value is raised to 6 or higher after the treatment, and all metal parts in the filter material are separated out into cations.

(3) Adjusting the pH value of the sewage to about 8, adding a small amount of flocculant (such as PAC (polyaluminium chloride) and PAM (polyacrylamide)), performing air flotation sedimentation, obtaining clear effluent, ensuring that COD (chemical oxygen demand) meets the requirement, and meeting the national first-level discharge standard by using conventional treatment methods such as biochemistry, nano titanium dioxide photocatalysis and the like.

Comparative example

The commercial iron-carbon micro-electrolysis filler replaces the degraded COD in the sewage filter tank_CrFilter material (keeping the same thickness), the other conditions are the same as the step (1-2) of the example 7, and COD is obtained after the sludge is treated by the sewage filtering tank_CrThe removal rate is lower than 60%, and the color is heavier.

Claims

1. COD degradation_CrA decolorizing filter material, characterized in that the COD is degraded_CrDecolorizing filterThe material comprises the following components in percentage by weight:

2. COD degradation_CrThe decolored sewage treatment device comprises a filter tank, wherein the filter tank is provided with a filter layer, and the filter material of the filter layer is the COD degradation device according to claim 1_CrA decolorizing filter material.

3. The wastewater treatment apparatus according to claim 2, wherein the water inlet of the filtration tank is disposed at a lower portion of the filtration tank, and the water outlet is disposed at an upper portion of the filtration tank.

4. The sewage treatment device according to claim 2 or 3, wherein a certain interval is provided between the filtering layer and the bottom of the filtering tank, and the bottom of the filtering tank is provided with a micropore aeration device.

5. Reduce sewage COD_CrThe method for decoloring, which comprises contacting the sewage with a filter material, wherein the filter material is the COD-degrading filter material according to claim 1_CrA decolorizing filter material.

6. The method of claim 5, wherein the pH of the wastewater is adjusted to 3-4 before contacting the wastewater with the filter material.

7. The method of claim 5 or 6, wherein the wastewater filtration material is contacted for a period of time of 8 to 30 minutes.

8. The method according to claim 5 or 6, wherein the sewage is aerated at the lower part of the filter material while being in contact with the filter material.

9. A method according to claim 5 or 6, characterized in that after removing the suspended matter and/or the contaminated oil from the contaminated water, the pH of the contaminated water is adjusted and the contaminated water is brought into contact with the filter material.

10. The method of claim 5, wherein after the wastewater contacts the filter material, the pH of the wastewater is adjusted to be alkaline, and a flocculating agent is added to remove scum by air flotation.