Oil removal and heavy metal removal modified walnut shell filter material and preparation method thereof

Abstract

The invention discloses an oil removal and heavy metal removal modified walnut shell filter material and a preparation method thereof; the surface of the oil removal and heavy metal removal modified walnut shell filter material is provided with an oxidized graphene coating. The preparation method of the filter material includes the steps that walnut shell powder and oxidized graphene powder are added into a V-shaped mixer simultaneously to be stirred and mixed uniformly, then a cross-linking agent and deionized water are added, cross linking is conducted at the temperature of 50-80 DEG C for 3-3.5 hours, after the liquid phase is filtered out, absolute ethyl alcohol is washed to be neutral, drying is conducted for 1-3 hours at the temperature of 100-140 DEG C, finally a vibration screen is utilized to screen out the filter material with the particle size meeting the requirement, and a finished product is obtained. By means of the filter material, grease and heavy metal in sewage water can be removed simultaneously, the sewage treatment process is greatly simplified, sewage treatment cost is lowered, sewage treatment efficiency is high, the filter material is high in hardness, resistant to wear, good in pressing resistance, not prone to caking, large in toughness, easy to regenerate, long in replacement cycle and low in cost.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection materials, and can simultaneously remove oil and heavy metals in sewage by modifying walnut shell filter material, and more specifically relates to a modified walnut shell filter material for oil and heavy metal removal and a preparation method thereof. Background technique

[0002] Water treatment fillers and filter materials are filter medium materials used for physical and chemical treatment in water treatment processes and carrier materials for microbial habitats in biochemical treatments. They are indispensable links that directly affect the treatment effect in modern water treatment processes. In the filtration technology, the composition of the filter material and the filter material layer is the key to determine the performance of the filter equipment. They determine the quality of the filtered water and the basic performance of the filter equipment. Therefore, the develop...

Examples

Embodiment 1

[0035] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.2, then the value of the thickness T of the graphene coating is T=0.2-0.36mm.

[0036] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0037] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0038] (2) Disinfection and cleaning: the walnut shells after the screening are soa...

Embodiment 2

[0046] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.4, then the value of the thickness T of the graphene coating is T=0.4-0.72 mm.

[0047] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0048] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0049] (2) Disinfection, cleaning: the walnut shells after the screening are soake...

Embodiment 3

[0057] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.3, then the value of the thickness T of the graphene coating is T=0.3-0.54 mm.

[0058] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0059] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0060] (2) Disinfection and cleaning: the walnut shells after the screening are so...

technical field

[0001] The invention belongs to the technical field of environmental protection materials, and can simultaneously remove oil and heavy metals in sewage by modifying walnut shell filter material, and more specifically relates to a modified walnut shell filter material for oil and heavy metal removal and a preparation method thereof. Background technique

[0002] Water treatment fillers and filter materials are filter medium materials used for physical and chemical treatment in water treatment processes and carrier materials for microbial habitats in biochemical treatments. They are indispensable links that directly affect the treatment effect in modern water treatment processes. In the filtration technology, the composition of the filter material and the filter material layer is the key to determine the performance of the filter equipment. They determine the quality of the filtered water and the basic performance of the filter equipment. Therefore, the develop...

Examples

Embodiment 1

[0035] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.2, then the value of the thickness T of the graphene coating is T=0.2-0.36mm.

[0036] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0037] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0038] (2) Disinfection and cleaning: the walnut shells after the screening are soa...

Embodiment 2

[0046] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.4, then the value of the thickness T of the graphene coating is T=0.4-0.72 mm.

[0047] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0048] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0049] (2) Disinfection, cleaning: the walnut shells after the screening are soake...

Embodiment 3

[0057] A modified walnut shell filter material for removing oil and heavy metals of the present embodiment has a graphene oxide coating attached to the surface of the walnut shell filter material, and the thickness of the graphene coating is T, which satisfies T=λd, where λ is a constant Coefficient, the value is λ=0.2~0.4, d is the particle size of the walnut shell filter material, the value is d=1~1.8mm. In this embodiment, we take the value of λ as 0.3, then the value of the thickness T of the graphene coating is T=0.3-0.54 mm.

[0058] The above-mentioned preparation method of a modified walnut shell filter material for removing oil and heavy metals comprises the following steps:

[0059] (1) Raw material screening: the walnut shell raw materials are air-selected with a winnowing machine to filter out green skin and firewood impurities, and then remove the walnut shells bitten by insects;

[0060] (2) Disinfection and cleaning: the walnut shells after the screening are so...