Walnut shell filter

Walnut shell water filter is a water filtration equipment with walnut shell as filter medium. It is mainly used to remove impurities such as oil and suspended matter in water. It is widely used in oily sewage treatment, industrial wastewater treatment, circulating water filtration and other fields. The following is its relevant introduction:

Working principle:

Filtration process: Water flows into the upper part of the filter, and after being evenly distributed by the water distributor, it passes through the walnut shell filter layer from top to bottom. Walnut shells have the characteristics of large specific surface area, strong adsorption capacity and large pollution interception. Impurities such as oil and suspended matter in the water are adsorbed and intercepted on the surface and internal pores of the walnut shell. The filtered water is collected by the water collector and flows out, thereby achieving water purification.

Backwashing process: When the impurities accumulated in the walnut shell filter layer increase and the filtration resistance increases to a certain extent, backwashing is required. During backwashing, the direction of water flow is opposite to that during filtration. It passes through the filter layer from bottom to top, causing the filter material to swell and loosen, and at the same time, the impurities attached to the filter material are washed down and discharged from the filter with the backwash water.

Structural composition:

Tank: usually made of carbon steel, stainless steel and other materials, used to hold walnut shell filter media and water, providing space for filtration and backwashing process. The size and shape of the tank body are determined according to the requirements of the water treatment volume and installation space.

Water distributor: installed on the upper part of the filter, its function is to evenly distribute the water to be filtered on the filter media layer to ensure that the water can fully contact the filter media and improve the filtration effect.

Filter media layer: composed of specially treated walnut shells, the particle size, shape and other parameters of the walnut shells will be selected according to the specific filtration requirements. The thickness and filling method of the filter media layer will also affect the filtration performance and backwashing effect of the filter.

Water collector: located at the bottom of the filter, used to collect the filtered clean water and export it out of the filter. The design of the water collector should ensure the uniform collection of water to avoid local water accumulation or poor water flow.

Backwash system: including backwash water pump, backwash pipe, valve and other components, used to provide backwash water and control the backwash process. The parameters of the backwash system (such as backwash water flow, pressure, etc.) need to be designed and adjusted according to the specifications of the filter and the characteristics of the filter media.

Advantages:

Good oil removal effect: It has a strong adsorption capacity for oil substances in water, can effectively remove oil from water and improve water quality.

High filtration accuracy: It can remove fine impurities such as suspended matter and colloids in water, so that the effluent water quality meets the requirements of various industrial water and sewage treatment.

Renewable filter media: Walnut shell filter media can restore most of its filtration performance after backwashing, with a long service life, reducing the frequency and cost of filter media replacement.

Low operating cost: Filtered water can be used as backwash water during backwashing, without the need for additional chemicals and air sources, and the operating cost is low.

Environmentally friendly: Walnut shell is a natural material with a wide range of sources. It will not pollute the environment after use and meets environmental protection requirements.

Walnut shell water filters have a wide range of applications, mainly including the following aspects:

Petroleum industry:

Oilfield wastewater treatment: The produced water from the oilfield contains a large amount of crude oil, suspended particles and other pollutants. The walnut shell water filter can effectively remove these impurities, provide qualified water sources for oilfield reinjection water, reduce pollution to the formation, and protect the mining environment of the oilfield.

Petrochemical enterprise wastewater treatment: Petrochemical production will produce oily wastewater, chemical wastewater, etc. Walnut shell filters can deeply treat these wastewaters, reduce the oil content, chemical oxygen demand (COD) and other pollutant indicators in the water, so that they can meet the emission standards or reusable levels.

Industrial field:

Steel and metallurgical industry: The steel and metallurgical production process will produce a large amount of oily wastewater and wastewater with high turbidity, such as steel rolling wastewater, ironmaking wastewater, etc. Walnut shell water filters can remove oil, suspended matter and heavy metal ions in the wastewater, realize the recycling of wastewater, reduce the use of new water and the discharge of wastewater.

Coal industry: A large amount of wastewater containing coal dust, suspended matter and a small amount of oil will be produced during coal mining and processing. Walnut shell filters can purify these wastewaters, remove impurities, and enable the treated water to be used in coal washing, dust reduction and other links, thereby improving the utilization efficiency of water resources.

Power industry: In power plants, walnut shell water filters can be used to treat circulating cooling water and boiler feed water. It can remove suspended matter, microorganisms, organic matter and other impurities in the water, prevent scaling and corrosion inside the cooling system and boiler, and ensure the normal operation of the power plant.

Environmental protection engineering:

Urban sewage treatment: It can be used as a pretreatment equipment for urban sewage treatment plants to remove large particle impurities, oil, etc. in sewage, reduce the load of subsequent biological treatment units, and improve the efficiency and stability of the entire sewage treatment system.

Industrial wastewater deep treatment: For some industrial wastewater that has been preliminarily treated but still cannot meet the discharge standards, walnut shell water filters can be used for deep treatment to further remove residual pollutants in the water to meet environmental protection requirements.

Other fields:

Ports and docks: Ports and docks will produce a large amount of oily sewage, such as ballast water and tank washing water of ships. Walnut shell water filters can treat these sewage to prevent oil pollution from polluting the water environment.

Food processing industry: Wastewater containing organic matter such as oil, protein, starch, etc. will be produced during food processing. Walnut shell filters can remove these impurities in the wastewater, reduce the degree of pollution of the wastewater, and achieve standard discharge or reuse of the wastewater.