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r� • also have been numerous failures. In "bugs" can be acquired. The commer- requirements for ex situ projects can be some of these cases, the cost of remedi- cial "bugs"jump start the process. provided through the proper applica- i ation was increased by the misapplica- Myth No. 7 — Proprietary nutrient tion of commercially available fertiliz- tion of bioremediation technology. mixes are required to sustain the popula- ers, The critical areas of a bioremedia- tion of hazardous chemical degrading Care should be taken when adding tion project that require the use or microorganisms. Micro-organisms all nutrients during in situ aquifer treat- experienced contractors include the require certain levels of nutrients. If ment. Improper nutrient addition can following: these nutrients are not available natu- cause precipitation of calcium,iron and • Site screening----Make sure you do rally, they must be supplied during magnesium. In addition, some in situ not do unnecessary treatability stud- remediation. General nutrient require- application of nutrients may cause a ies. Preliminary screening can be ments are well established in the swelling of clays. achieved by most knowledgeable en,.�- literature. The optimal mix of nutri- Myth No.8—Given enough time and ronmental contractors. Final screening ents should be determined during proper conditions, you can use bioreme- I should be conducted by a specialist. treatability testing. The nutrient continued on page 26 • Treatability Studies — A false positive at this stage of a project can cost millions of dollars. Hire an experi- enced firm that has donr numerous treatability studies. MOBILE HIGH VOLUME • Process Engineering and Field SLUDGE DEWATERING UNITS... Supervision —Translating lab results ' to the field can be difficult. Sclect an :. > Ya,y ~; '• engineering and field contractor that Pq 7–? has the experience to identify and i _ 0 ___J overcome the scale-up problems associ- C ated with bioremediation. { 1 t While almost any qualified environ- ItDEWATERING mental contractor will achieve biore- ll i mediation success at a few sites, one bad experience can cost the responsible 1 party both time and money. A few ,�.• •;;;_. 4 projects have seen their remediation costs increase because of surprises in -.. Y the field that could have been antici- pated with a larger experience base. _ K ,�. Myth No. 6 —Specialty "bugs' must eY ' •.fix r be used to apply the technology success- fully. There are no documented success stories of utilizing specialty or designer microorganisms to biodegrade hazard- ous chemicals. All of the bioremedia- • , tion success stories reported to date have utilized naturally occurring microorganisms. While specialty microorganisms are ■ Short,month-to-month, ■ Fast delivery,set-up, not required, some sites may require or long term leasing breakdown&removal } an increase in the population of natu- S Fast response ■ Operate with our rally occurring microorganisms. Typi- to emergencies personnel or yours— cally this is achieved by taking a small ■ Mobile fleet of state-of- we can provide quick portion of the naturally occurring the-art, high volume on job training microorganisms and increasing their sludge dewatering units E No capital investment population. The increased population COMPLETE LINE OF INDUSTRIAL h MUNICIPAL SLUDGE MANAGEMENT SERVICES: of microorganisms then is applied to ■ On-Site Sludge Dewatering the waste to increase the rate of ■ Lagoon&Digester Cleaning i biodegradation. ■ Disposal through Land Application !� In some cases, upsets will occur in the application of the technology, and BIINC.OMIC SERVICES, lir I' the microorganism population will be A Carylon Company inhibited. If time is not available to 516 Roundtree Road,Charlotte,NC 28217 t rebuild the population of naturally i occurring microorganisms from the ite, then a population of commercial , # 64 i '• I' MAY 1992 Circle 17 on card. 25