BKT’s biological ﬁltration (BBF) system has been approved by the California State Water Resources Control Board as an alternative ﬁltration technology for achieving the minimum turbidity level required under Title 22 of the California Water Recycling Criteria.
Over the last six months, BKT has tested its BBF technology extensively at a pilot plant located at Los Angeles County Sanitation District’s Joint Water Pollution Control Plant in Carson, CA. During this time, BBF has consistently met Title 22 guidelines in normal operation, meeting the turbidity requirement of 2NTU while achieving 93% removal of total nitrogen from non‐nitriﬁed secondary eﬄuent.
A vast majority of wastewater treatment facilities in the United States, most of which were built decades ago, are not able to meet low nitrogen discharge limits. Pollution resulting from the operation of these plants has therefore led to severe environmental problems. The limitations of these existing facilities present a serious technological hindrance for water reuse applications requiring nitrogen removal, including groundwater replenishment.
Now proven to function eﬀectively in ﬁltration, BBF is capable of simultaneously removing nitrogen while occupying equal or less space compared to traditional tertiary ﬁltration options such as sand ﬁlters. This compact footprint makes BBF an ideal choice for retroﬁtting outdated wastewater facilities looking to update their technology with nitrogen removal processes under space limitations.
Worldwide, BBF has over 100 reference sites from small, decentralized wastewater treatment packages to installations up to 190 MGD in capacity. Recently, the City of Barstow, CA selected BBF for use in an ongoing groundwater remediation project to remove nitrates. BBF technology has successfully been applied to municipal wastewater treatment, groundwater remediation, and combined sewer overﬂow (CSO) control.