Best Management Practices for Sewer and Storm Conveyance to avoid impacts from Micro Brewing. Bobbi Wallace City of Kirkland Wastewater Manager

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1 Best Management Practices for Sewer and Storm Conveyance to avoid impacts from Micro Brewing Bobbi Wallace City of Kirkland Wastewater Manager

2 Introduction Bobbi Wallace Surface and Wastewater Manager City of Kirkland, Department of Public Works P / C / F bwallace@kirklandwa.gov Caring for your infrastructure to keep Kirkland healthy, safe and vibrant.

3 Aloha Hawaii Story From: Iha, Milton Sent: Wednesday, February 05, :27 AM To: Bobbi Wallace Subject: RE: Micro Breweries pretreatment Hi Bobbi, Just got a call from our collection system people about having to replace a lateral as a result of a jelly like substance causing blockage, and it was downstream from among others, a brewery. Do you know if it could be from the brewery discharge, and would you know what it is? Also, if so, what type of pretreatment is necessary to prevent this type of discharge? Thanks Milton Iha Supervising Wastewater Service Investigator City and County of Honolulu Dept. of Environmental Services Environmental Quality Division Regulatory Control Branch (808)

4 King County Discharge Permit Following is language typically inserted into discharge approval documents issued to breweries by King County: Maintain an accessible and representative sample site where the industrial waste discharge to the sewer from the brewing and/or kegging activities can be monitored. Monitor & neutralize the ph of the industrial waste discharge to the sewer to insure compliance with King County ph discharge limitations (ph must remain between 5.5 and 12.0 s.u.). All floor drains must be fitted with covers or served by screening devices, which have openings not larger than one quarter (1/4) inch in diameter.

5 King County Discharge Permit Residual solids in pipelines, cookers, vessels, kettles and tanks shall be collected and disposed of as solid waste or recycled as animal feed or compost. Spent yeast shall be killed and disposed of as solid waste or recycled as animal feed. The supernatant may be decanted and discharged to the sewer, provided that it meets ph discharge limits. Sumps and all other equipment provided for the recovery and disposal of waste solids shall be maintained in effective operation to prevent the discharge of solids into the sanitary sewer system.

6 Possible Problem (Jelly) it might be overly grown biofilm (aka slime) given the fact micro brewery wastewater are extremely organic rich (BOD can be in the 10,000 vs. typical wastewater of ). Or if they use polymer in their treatment process, it might be polymer that coagulated and/or flocculated. (Pierce County Wastewater)

7 Possible Problem (Jelly) Also have him try to i.d. the all ingredients (raw materials?) used at the site. Maybe the wheat type beers leave a gluten or something settling out that we haven t seen before with the hops and barley, etc. stuff? Just a thought. The thinkers here are thinking too. Some cities are also reporting newer fatty deposits in laterals & sewers from coffee places that make a lot of creamy type coffees and drinks. (Orange County, CA Wastewater)

8 More BMP and INFO After cleaning and sanitizing the tanks, the acid and caustic cleaners should be returned to a clean in place reservoir where it could be used again or neutralized prior to discharge (with a ph meter to ensure compliance) Pretty much an industry standard. American Brewing Company replied that solids (yeast) removed from the fermentation process were recaptured and re pitched in the next fermentation tank. The spent grain is screened and put into barrows to be picked up by a farmer. Left over hops is also sent out with the spent grain. (City of Edmonds Wastewater)

9 More BMP and INFO American Brewery projections were about 1800 gal/week for the initial year. Edmonds classified their discharges as acceptable under the following conditions: ph of their discharge must be between 5 and 11; adjust as required. Specify if any prepared food will be served in the tasting area. For any abnormal discharges such as a barrel of product, the WWTP must be notified and provide permission prior to discharge. (Pretreatment should check out the drain configuration for the tanks as well). The brewery also asked about a deduct meter to give the City the option recalculating the water bill. The City was open to that idea, provided the brewery installed an approved water meter. A year or two later, a DIY wine and beer making place moved to the same complex in addition to American Brewery. To my knowledge, we have not had issues related from either business. (City of Edmonds Wastewater)

10 More BMP and INFO A jelly quality made me think more of a biofilm or sugar slime growth we ve seen or heard of in drains. As I ve read, even drains from bar ice bin drains (no wastewater per se) will develop slime/jelly like growths that eventually restrict flow. So one might wonder if any other users/discharges in the area might be contributing to such a growth in the system Other infiltration, inputs, or line conditions in play that under right conditions with right MOs in play could lead to growths? Curious what analysis of material shows, but unless only known source on line it could be premature to conclude the poopetrator is the brewing operation. City of Everett Wastewater

11 More BMP and INFO Suspect the level of concern about these discharges depends a lot on how big one s system and flows are relative to the size of operation, discharge volume etc. I have seen threads (Yahoo PTC etc) reflecting high BODs in particular from brewing ops, typically smaller batch discharges. I suspect the cost of sampling and analysis alone would likely exceed any surcharge $ we d see from those batches given usually very small volume. And short of batches gone bad, or poor handling of materials as Edmond s list eludes to, most need/want products in kegs and bottles, not down drains; and spent grains, hops and such need to go to ag/farm/compost recyc loops. City of Everett Wastewater

12 More BMP s to Come! Please note that the King County Industrial Waste Program (KCIW) has initiated a project to evaluate the brewery and winery industry sectors. The intent of the project is to develop best management practices for the management & disposal wastes generated by these facilities and establish permitting guidelines.

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