![]() ![]() BOD & TSS are what most municipalities look at then applying surcharges. The BOD of this low-strength wastewater is still high-strength compared to typical municipal wastewater, so side streaming doesn’t solve all of your problems, but it does help. This will be cleaning and CIP water in your cellar and brewhouse, as well as any packaging line wastewater, boiler blow-down, cooling tower blow-down, and general wash-down waters. How side streaming can help save you moneyĪfter side streaming, the remaining portion of your wastewater can be referred to as low-strength wastewater. The value of spent grain increases as moisture content decreases 80% moisture is a great target. Larger breweries should be able to sell their spent grain. Maybe you can get some free beef out of the deal. At a minimum you can give it away in exchange for the farmer promptly hauling it away. You might even decide to add your trub and spent yeast in here. Of course, spent grain should be your first side stream. But if you have a fertilizer company nearby, they might pay you for it. Generally the fertilizer content of this material is lower than the cost of hauling, so you may have to pay for hauling. If feeding it to animals, make sure you are not responsible for any misuse of this product by the hauler/farmer it can cause bloat and drunkenness. It can go on the fields as is, solids and high temperature are OK. You could have one big tank or you could use old chemical totes (IBCs) doesn’t need to be fancy. However you do it, collect this material and put it in a tank (outdoors, in back, it’ll stink), and spread it on pastures as fertilizer-or even feed it to animals. What to do with the side stream from your brewery Something short with casters on it, so it can go under a whirlpool or lauter tun. Better is a ‘portable floor drain’ made of stainless steel that can be wheeled around. An old 55-gallon drum with the top cut off works, but it will deform. Double diaphragm pumps work fine, make sure it can handle solids and if it’s in the brewhouse, make sure it can handle high temperatures. You will have to go overhead or along the walls with the piping, so you will need to pump the material. You can still side stream if you can’t or don’t want to tear up your slab, it just gets a little trickier. Luckily you don’t need many of these side-stream equipment drains: If you are building a new brewery or tearing up the slab in an existing building this is definitely the way to go. One set for floor drains, another set for side-stream drains. If you’re following along, you will notice that this requires a separate set of drain lines under your slab. ![]() Everything else enters the normal floor-drain system. Specific high-strength materials are piped or hosed into the equipment drain. This prevents other material from entering the pipe. Instead a pipe extends up through the floor about 6 inches. ![]() Very similar to a floor drain, but there is no drain. My favorite method for collecting this side-stream material is via an equipment drain. BOD can’t just be filtered from your wastewater. All of this material is very high in BOD (biochemical oxygen demand) and TSS (total suspended solids) and are easy targets to separate if you need or want to lower the BOD and TSS of your brewery’s wastewater. Lauter tun rinsings, hop back rinsings, kettle residues, and trub. Sources of this high-strength wastewater include fermenter bottoms, spent yeast, returned beer in kegs, fermenter blow off, beer in hoses or pipes at the beginning or end of a packaging run but the primary source is the brewhouse. Side-streaming is collecting high strength, concentrated wastes at the source-before it hits the floor, and setting it aside for disposal. How side streaming your brewery wastewater can save you money What is side stream? So I asked John to write a blog about it.Ĭheck out more free resources about brewery wastewater management on the Brewery Wastewater Design website. I was fascinated by the concept of side-streaming to possibly cut costs from the sewage treatment plant. He taught us all about wastewater treatment for a craft brewery. John was our guest on MicroBrewr Podcast episode 033. His company, Brewery Wastewater Design in Montrose, Colorado, specializes in designing wastewater systems for breweries of all sizes. John Mercer has more than 15 years of wastewater experience in breweries and laboratories. Even if you’ve been producing beer for years, there are things you can do to reduce your load on the municipal wastewater treatment facility and potentially reduce your sewage bill. Hopefully you thought about your brewery wastewater management before you built your brewery. For every gallon of beer made, it takes 7 gallons of water. ![]()
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