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Meanwhile, the Environment Ministry, which conducted separate research on Feb. 23 and 24, said Tuesday it found that nutrient salts necessary for the growth of seaweed had plunged in quantity to almost undetectable levels almost throughout the inland sea.The ministry also said in a report that quantities of ''''chlorophyll a'''' -- a substance in photo plankton -- in many of the 24 points surveyed in the sea were unusually high. Photo plankton consume nutrient salts.In one area deep inside the bay, the ministry detected 20 micrograms of the substance per liter -- almost matching concentrations found during times of so-called red tides caused by massive outbreaks of photo plankton. A microgram is one-millionth of a gram.

Controlling the Integrated Water-Recovery SystemIn this section, we describe the control tasks for the final IWRS system that went into test in 2001, first by subsystem and then for the IWRS as a whole (figure 8).The Biological Water ProcessorFeed water from the waste-water collection system (figure 3) first passes through the BWP. The main control task for the BWP is to keep the water in the gas-liquid-separator (GLS) (see the lozenge icon with the three-level switches in the upper left of figure 8) at mid-level, which is accomplished by varying the speed of the feed pump, and the draw from the reverse-osmosis main pump remains constant. The other requirement is to monitor the pressures in the recycle loop, as well as in the nitrifier tubes, and carry out automatic shutdown procedures in the case of off-nominal values. For example, if one of the nitrifier tubes shows too high a pressure, the water and air pumps associated with this tube are shut down, and a warning is issued.