Walnut shell filter is a filter equipment suitable for oily sewage treatment. The internal use of the equipment has a strong adsorption capacity, strong pressure resistance, chemical stability, high hardness, good hydrophilicity, oil resistance and special processing of the walnut shell as the filter material, its biggest characteristic is that the filter material backwash regeneration is convenient, can be directly used before the filter water backwash, without air source and chemical agents.
Product characteristics：
Oil immersion resistance, oil, suspended solids removal, strong adsorption, large amount of pollution interception; Easy regeneration, backwash dosing optional.
Technical parameter：
1.Treatment effect
Coarse filter
Water intake: oil, ≤100mg/L, SS, ≤50mg/L; Effluent: oil, ≤10mg/L, SS, ≤10mg/L
Fine filtration
Water intake: oil, ≤20mg/L, SS, ≤20mg/L; Effluent: oil, ≤5mg/L, SS, ≤5mg/L
Two-stage series
Water intake: oil, ≤100mg/L, SS, ≤50mg/L; Effluent: oil, ≤5mg/L, SS, ≤5mg/L
Intercepting capacity
6-20kg/m2
2.Working environment parameter
①. Working temperature: 5-60℃ (special temperature can be customized);
②. Working pressure: ≤0.6MPa;
③. Inlet water pressure: ≥0.04MPa;
④. Backwashing inlet water pressure: ≥ 0.15MPa;
⑤. Pressure difference between import and export: 0.1-0.2MPa。
3.Operating parameter
①. Working mode: pressure type;
②. Operation mode: water flow from top to bottom;
③. Filtration speed: 20-25m/h;
④. Running cycle: 8-24h;
⑤. Backwash mode: gas-water combined backwash
⑥. Backwash water consumption: 1-3%;
⑦. Backwash strength: 4-15l/s·m2;
⑧. Backwash duration: 20-30min;
⑨. Backwash expansion rate: 30-50%
Working principle：
The filter is the separation equipment developed successfully by the principle of filtration and separation, using the oil-resistant filter material – special walnut shell as the filter medium, the walnut shell with large surface area, strong adsorption force, large amount of fouling characteristics, remove the oil and suspended matter in the water. The device has automatic and manual control mode. Filtration, water flow from top to bottom, through the water distributor, filter material layer, water collector, complete filtration. Backwash, the agitator turns the filter material, water bottom up, so that the filter material is thoroughly cleaned and regenerated.
Scope of application：
1. Applicable to the recycling and filtration treatment of oily sewage and other oily wastewater recycling systems in iron and steel, metallurgical industry, coal industry.
2. It is suitable for fine filtration of oil field reinjection water with large water volume, water produced from offshore oil platform and water reclaimed from hot recovery boiler of heavy oil field.
3. Suitable for filtration treatment and advanced treatment of cooling circulating water in power plant, refinery and petrochemical plant.
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