Method for automatic control of corrosion in a water distributio

Details Method for automatic control of corrosion in a water distributio Method for automatic control of corrosion in a water distributio

1996-06-25

1998-02-24

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210742, 210743, 364500, 422 3, 422 14, C02F 508

Patent

active

057208840

ABSTRACT:
A water distribution system facilitates automatic corrosion control. The operator enters a set of values of parameters associated with water in the system. The system automatically and repeatedly measures the temperature and pH of the water. The system then computes a target pH for the water, according to a function which depends on the temperature and the other parameters, and on an index of corrosion. The system then varies the pH of the water, so as to minimize the deviation between the measured pH and the target pH. The system performs this process repeatedly, to maintain the desired properties of the water. In particular, the operator can easily and automatically control the water so as to make it either more corrosive or more scale-forming, in such a manner as to minimize the dissolution of lead or copper into the water while limiting the tendency of the water to form scale.

REFERENCES:
patent: 4830757 (1989-05-01), Lynch et al.
patent: 4931187 (1990-06-01), Derham et al.
patent: 5057229 (1991-10-01), Schulenburg
patent: 5294916 (1994-03-01), Bolton et al.
patent: 5391302 (1995-02-01), Funahashi et al.
Article "An Update of the Federal Regs", F. Pontius, Journal of the American Water Works Association, Mar. '96, pp. 36-46.
Article "Alkalinity, pH, & Copper", Edwards et al, Journal of the American Water Works Association, Mar. '96, pp. 81-94.
Publication entitled "Pump-Colorimeter Analyzers", of the Hach Company (undated).
Article "Determine Saturation and Stability Indexes Graphically", Yi-Shon Chen, Stone & Webster Engineering Corp.
Excerpts from publication of American Water Works Association Research Foundation, entitled "Lead Control Strategies", 1990.
EPA Lead and Copper Rule Guidance Manual, vol. II: Corrosion Control Treatment, Sep. 1992.

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