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<br /> u <i i <,; \I _~ I':, i\ <br />. <br /> as soil amendments and conditioners. Biusolids odor control and hazi <br /> are also bumed-creating energy to use at our ardous air emissions. <br /> treatment plants-then recycled as a construci MWCC is responding -M. <br /> tion material or an ingredient in NutraLime, a vigorous l y to these new <br /> I <br /> soil conditioner. In 1992, MWCC's NutraLime requirements. We also <br /> program was presented an Award of Excellence recognize that fulfilling <br /> from the National Environmental Awards them consistently will <br /> Council, representing 28 national organiza~ not only require im~ <br /> tions including the Sierra Club. the Audubon proving our treatment <br /> Society and the Izaak Walton League. process, but also devel- MWCC'~ biosolids recyi <br /> oping new techniques and equipment that cling program is nationally <br /> TOUGHER Perhaps the most aren't currently part of our standard operations. recognized. <br /> STANDARDS, constant trend in These improvements could cost millions of <br /> NEW wastewater treati dollars at a time of fiscal restraint. <br />. CHALLENGES ment is increasingly There are also concerns that instruments <br /> stringent environi be developed to verify new environmental <br /> mental and health standards. The five.year standards that are lower than our current ana- <br /> operaring permit issued in 1993 by the Min- lytical equipment is capable of measuring. <br /> nesota Pollution Control Agency to MWCC's <br /> Metro Plant-which treats 80 percent of the <br /> wastewater in the metro area and half the <br /> state1s total-is the strictest in the plant's 55i METRO PLANT EFFLUENT DISCHARGE, 1983-1993 <br /> year history. As parr of the permit requirement, > 60 <br /> > <: ------------------------------PERMITtEyEL~5) <br /> the Metro Plant will develop a new sidestream ~ ~ ~ 40 <br /> '>~ <br /> a.~ <br /> process that will lower the plant's phosphorus 5~~ 20 <br /> . . + <br /> :::c <br /> . 0 <br /> discharge by up to 25 percent. Phosphorus is a . m 0 <br /> ~ - <br /> 83 84 85 86 87 88 89 90 91 92 93 <br /> naturally occurring element essential to most YEollR <br /> forms of life but which in excessive amounts REGIONAL. Pl.,ANTS EFFL.UENT DISCHARGE, 1983.1993 <br /> lowers Water quality. > '" 60 <br /> ~ = ~ ------------------------------PERMITtiv!L(SS) <br /> Besides meeting tougher standards by ~ ~ ~ 40 <br /> ".~ <br /> !:C ~ I- <br /> removing pollutants in wastewater, MWCC . . + 20 <br /> ~~g <br /> . m 0 <br /> must also respond to the challenge of a growing ~ - <br />. 83 84 85 86 87 88 89 90 91 92 93 <br /> YEAR <br /> range of new regulatory requirements such as <br /> 5 <br />