Walnut shell filter is a filter equipment suitable for oily sewage treatment. The equipment uses walnut shells with strong adsorption capacity, strong pressure resistance, stable chemical properties, high hardness, good hydrophilicity, oil immersion resistance and special processing as the filter material. The biggest feature is that the filter material is backwashed and regenerated. It is convenient and can directly use pre-filter water for backwashing, without air source and chemical agents.
Features
Anti-oil immersion, dual-effect removal of oil and suspended solids, strong adsorption capacity, large amount of pollution interception; easy regeneration, optional backwashing and dosing.
Technical Parameters
1. Processing effect
Coarse Filtration
Inlet water: oily, ≤100mg/L, SS, ≤50mg/L; Outlet water: oily, ≤10mg/L, SS, ≤10mg/L;
Fine Filtration
Inlet water: oily, ≤20mg/L, SS, ≤20mg/L; Outlet water: oily, ≤5mg/L, SS, ≤5mg/L;
Secondary Series
Inlet water: oily, ≤100mg/L, SS, ≤50mg/L; Outlet water: oily, ≤5mg/L, SS, ≤5mg/L;
Interception capacity
6-20kg/㎡
2. Working Environment Parameters
①Working temperature: 5-60°C (special temperature can be customized);
②Working pressure: ≤0.6MPa;
③Inlet water pressure: ≥0.04MPa;
④Backwash water pressure: ≥0.15 MPa;
⑤Import and export pressure difference: 0.1-0.2MPa.
3. Operating parameters
①Working method: pressure type;
②Operation mode: water flow from top to bottom;
③Filtration speed: 20-25m/h;
④Operation cycle: 8-24h;
⑤Backwashing method: air-water combined backwashing;
⑥Backwash water consumption: 1-3%;
⑦Backwash intensity: 4-15l/s m2;
⑧Backwash duration: 20-30min;
⑨Backwash expansion rate: 30-50%.
Working Principle
The filter is a separation device successfully developed by using the principle of filtration and separation. It uses oil-resistant filter material—special walnut shell as the filter medium, and uses the characteristics of large specific surface area, strong adsorption force and large sewage interception capacity of walnut shell to remove oil and pollutants in water. suspended solids. The device has automatic and manual control methods. When filtering, the water flows from top to bottom, passing through the water distributor, filter material layer, and water collector to complete the filtration. When backwashing, the agitator turns over the filter material, and the water flows from bottom to top, so that the filter material is thoroughly cleaned and regenerated.
Scope of Application:
1. It is suitable for the filtration treatment of oily sewage in iron and steel, metallurgical industry, coal industry and other oily wastewater recycling systems;
2. It is suitable for fine filtration of oilfield reinjection water with a large amount of water, offshore oil platform produced water and heavy oil oilfield thermal recovery boiler regeneration water treatment;
3. It is suitable for filtration treatment and advanced treatment of cooling circulating water in power plants, oil refineries and petrochemical plants.
