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Kitchen Sink wastewater is a mixture of detergent soap, food left-over, and water used in washing kitchen utensils. This wastewater as it travel through the drain pipe, gunk is formed and this substance clings to the pipe wall and solidifies and overtime hardens which completely clogs the drain pipe and notoriously is very difficult to de- clog and costly. Here' a simple DIY kitchen wastewater interceptor for you to avoid the troubles of drain pipe clogging. But, first, let me explain how it works.

How to get rid of kitchen fat, oil, and grease (FOG) from clogging

your drain pipe

by: Elias Quijano


Now, let me show you the drawing. You can have this drawing for free. Click this link to download the drawings: 1. FOG interceptor 1 of 2 2. FOG interceptor 2 of 2 Meanwhile, you can fabricate this FOG interceptor in any of these 2 ways: 1. Using ¼” thick plywood, assemble it according to the drawing, then laminate both the inside and outside to make it water-proof and be resistant to chemical corrosion; 2. Make a GRP flat sheet using 3 layers of chooped strand mat, 450 g/m2. Cut to size all the parts according to the drawing, and assemble it. Joints can be done by lamination. To make the GRP flat sheet, you will need the following tools and materials: A. Tools 1. A flat-surface table; 2. Lamb Wool roller 3. Air-bubble releasing roller (screw-type roller) 4. Laminating brush 5. Fiberglass Reinforced Cut-off Wheels B. Raw Materials 1. Lumiror film 2. Chopped Strand Mat 450g/m2 (csm450) 3. Isopthalic Resin - premix with cobalt 6% napthanate 4. MEKP 5. Acetone (solvent for cleaning) C. Procedure for making the flat sheet 1. On the working table, lay flat the lumiror film (lumiror film will act as a barrier between the working table and the laminate); 2. Lay on the working lable, 1 layer of of the chopped strand mat, the size of which must equal to the surface area of all the parts that you will need to complete the whole FOG interceptor project; 3. Catalyze enough quantity of premix resin (enough for one shot that you can cover, say half liter in each shot). Make a test how much MEKP you will need to add to give you enough time to complete the whole lamination process. For example, if you can finish the lamination work in 2 hours, you must estimate how many shots it will take you to finish the flat sheet lamination work, Say 5 shots, therefore you will need a gelling time of not less than 30 minutes per shot; 4. Impregnate the csm450 with the catalyzed resin using the lamb wool roller; 5. Overlay another layer over the first layer and imprenate in the same way; 6. Overlay the 3rd and last layer and impregnate, then using the air-bubble releasing roller, roller the whole laminate, squeezing out the air bubbles. Allow the laminate to gel and eventually harden and cure. 7. Clean your rollers with acetone on a separate container intended for this purpose. D. Cutting the parts 1. Make a carboard pattern for the side, bottom, and top parts of the FOG interceptor, according to the drawing; 2. Cut the parts to size according to your pattern; 3. Use an angle power grinder using a cutting disc 100mm dia. intended for GRP laminate. E. Assembling the components 1. Prepare a putty mix (resin + calcium carbonate powder) 2. Assemble the parts in such a way that it can be held temporarily, and then apply catalyzed putty mix on the joints. To catalyze the putty mix, simpply add MEKP and mix it thorougly using a pair of putty knife or spatula; 3. Allow the joints to harden. Then, apply a fast-gelling tack.A fast-gelling tack is a a small piece of csm450 impregnated with catalyzed resin (greater amount of MEKP is added than the usual amount, to effect a fast gelling); 4. Apply a permanent lamination on all the joints; 5. Allow the assembly to cure completely. A complete cure means, the laminate will register a barcol hardness of 40+. Note: A good post cure can be done by allowing it directly under the sunlight for a day. You can buy the following raw materials and tools: 1. Polyester Laminating Resin and MEKP Catalyst- https://amzn.to/3XtTeU0 2. Acetone or lacquer thinner - https://amzn.to/3Is2uDT 3. Mohair Laminating Roller - https://amzn.to/3E7RYiE 4. Fiberglass Laminating Roller - https://amzn.to/412xlOH 5. Clear mylar cellophane wrap roll - https://amzn.to/3Yz2asz 6. Royal Brush Golden Taklon Paint Brushs - https://amzn.to/40WMDV4 7. Calcium Carbonate Powder - https://amzn.to/40YfwA2 8. Angle grinder power tool - https://amzn.to/3I7LIIV 9. Fiberglass Reinforced Cut-off Wheels - https://amzn.to/3It4wDG 10. PVC pipes - https://amzn.to/3lzCAVD 11. PVC valves - https://amzn.to/3XF5lO2
Kitchen wastewater composed of fat, oil and grease (FOG) goes to the inlet of the interceptor and into the first compartment. Solid particles sink at the bottom, while the liquid wastewater overflows to the next compartment, over a baffle wall. FOG starts to float in the second compartment. As the wastewater moves to the last compartment, through an opening at the last baffle wall, underneath, clear water are collected and exits at the outlet fitting. This cycle is repeated everytime, new wastewater enters the interceptor inlet fitting, until such time, the collected FOG accumulates the whole top surface of the 2 compartments. At this point, it is time to clean the interceptor. For a family of 4, this FOG interceptor size, 560mm long by 220mm wide, and depth of 200mm, would require cleaning weekly. Cleaning is easy because you can completely lift and remove the top cover, and skim the FOG from the top. Then, flush out the full content of the interceptor thru the 2 drain valves at the bottom. Let me show you how the weekly cleaning is done. First, remove the top cover, skim the FOG and other waste substances that floats with the FOG, using an improvised can with handle, into a pail intended for this purpose. Clean all the top of the 3 compartments until all the FOG and other waste substances are removed. Open the valve of the primary compartment, flush out the solids clinging to the walls of the primary compartment. Here, I used a tootbrush. You can use your choice of brush convenient for you. Open the other drain valve for the other compartment and repeat the same procedure. Clean the walls by brushing and flushing with water. Close the drain valves and close the top cover. That's it.