Equalizing basin is installed ahead of the neutralizing system whenever possible. This will tend to level out fluctuations in influent flow and concentration. This point cannot be overemphasized, because the lack of such a basin has been the cause of many failures. Pumping from an equalizing basin at a constant rate eliminates the need for high range ability flow rate instrumentation. This, in combination with reduced variations in base or acid content, reduces the reagent feed range requirements. Equalization tanks are commonly used in industrial waste treatment to smooth out variations in flow and concentration that are expected in typical batch productions.
Equalizer valve is a dirty fluid valve for sealing high differential fluid pressures in a drilling environment and methods for using such a valve is disclosed. One embodiment of the valve includes a seal cartridge having several openings for directing a fluid path through the cartridge, a spring connected at one end of the seal cartridge and extending through the fluid path, and a seal member connected to the other end of the spring. The seal is actuatable between an open position and a closed position so that it covers one of the openings in the seal cartridge when it is in the closed position, thereby sealing off the fluid flow through the seal cartridge fluid path. The spring provides a pre-loading force to the seal member so that the seal member always has sufficient contact with the surfaces surrounding the opening that the seal covers.