| 摘要 |
PROBLEM TO BE SOLVED: To properly control the injection amt. of a flocculant necessary for holding the concn. of phosphorus in treated water to a target value from the water quality state of the reaction soln. in a biological reaction tank and to keep biological reaction well by accurately calculating the amt. of the suspended substance formed by the injected flocculant. SOLUTION: The monitor and control apparatus for water treatment has a coefficient operation part 60 for calculating the amts. of phosphorus and alkali to be removed per a unit flocculant amt. from the ratio of the concn. of phosphorus and alkalinity of the reaction soln. in a biological reaction tank 1, a flocculant amt. operation part 70 for calculating the injection amt. of a flocculant on the basis of the coefficient operation result, a sludge amt. operation part 80 for calculating at least one of a return sludge flow rate and an excess sludge flow rate on the basis of the coefficient operation result and the flocculant amt. operation result, a flocculant amt. control device 23 for operating a flocculant injection equipment 12, a sludge return equipment 7 and a sludge discharge equipment 8 on the basis of these operation results, a return sludge control device 25 and an excessive sludge amt. control device 27.
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