Process and equipment for automatic chemical-biological wastewater treatment with provisions for recycle and reuse

摘要

A wastewater disposal system, wherein, wastewater from producing sources is deposited in a holding tank after passing through a grinding device until a predetermined level has been reached, at which time a pump will remove the waste from the holding tank and discharge it into the aerobic treatment and settling tank where it will be aerated, and separated by settling to effluent and sludge. The sludge is removed from the treatment and settling tank thereafter for further treatment and settling so that liquid may be removed from the sludge for return ultimately to the treatment and settling tank or holding tank. The settled effluent may be removed and fed into a storage tank. Various pressure and level sensing controls are used in conjunction with a coordinating and timing control unit to control the sequence of operations for efficiency. An emergency fuel driven prime mover-generator may automatically supply electric power in emergencies. Sensors determine system failure and control an automatic telephone dialing warning system. Overflow from various tanks is fed to an overflow tank, with provision for distribution of back-up fluid. The aeration in the tanks is controlled by: modulating and/or controlling on/off of air delivery according to the dissolved oxygen content within the appropriate tank; and feed air pressure may be controlled according to sensed liquid head within the appropriate tank. With the exception of the tanks and some tank connecting lines, the entire system may be mounted on skids as a module that may be factory assembled and calibrated. Prior to settling, concentrated flocculant may be added by a flow through mixer with delayed shut-off of mixing liquid to flush the mixer and downstream lines of corrosive diluted flocculant.