Wastewater treatment apparatus
An apparatus provides for treatment of primary effluent from residential and commercial establishments to allow subsurface or surface disposal of wastewater.
1 . A wastewater treatment unit, comprising:
a tank having an interior region;
a divider located in the interior region of the tank to divide the interior region of the tank into two distinct chambers including a recirculation chamber and a dosing chamber having no direct fluid connection to said recirculation chamber;
a first filter layer containing filter media and being located above said recirculation chamber;
a second filter layer containing filter media and being located above said dosing chamber;
an influent pipe which directs wastewater entering said wastewater treatment unit into said recirculation chamber;
a recirculation pump located in said recirculation chamber, said recirculation pump pumping the wastewater from said recirculation chamber onto said first and second filter layers; and
an effluent discharge pipe connected to said dosing chamber, the wastewater being discharged from said wastewater treatment unit through said effluent discharge pipe for final disposal.
2 . The wastewater treatment unit as recited in claim 1 , wherein the tank includes a top surface and a bottom surface, the divider wall extending between the top and bottom surfaces to divide the wastewater treatment unit into the two distinct chambers.
3 . The wastewater treatment unit as recited in claim 1 , wherein an amount of wastewater which is proportionally distributed to the recirculation and dosing chambers is determined by the placement of said divider wall in the interior region.
4 . The wastewater treatment unit as recited in claim 3 , wherein the proportion of treated flow returning to the recirculation basin determines a recirculation ratio of the treatment process and a quality of the treated effluent.
5 . The wastewater treatment unit as recited in claim 1 , further comprising a recirculation pump riser pipe, a recirculation pump section riser, and a recirculation pump section riser lid to allow access and removal of the recirculation pump from the top of the ground without entering the recirculation pump chamber.
6 . The wastewater treatment unit as recited in claim 1 , further comprising a dosing pump located in said dosing chamber, said dosing pump pumping the wastewater from said dosing chamber through said effluent discharge pipe to disposal.
7 . The wastewater treatment unit as recited in claim 6 , further comprising a dosing pump riser pipe, a dosing pump section riser, and a dosing pump section riser lid to allow access and removal of the dosing pump from the top of the ground without entering the dosing pump chamber.
8 . The wastewater treatment unit as recited in claim 1 , further comprising a recirculation pump filter to reduce the likelihood of solids plugging downstream processes, a recirculation piping union to allow removal of the recirculation pump without entering the recirculation pump chamber, a recirculation distribution pipe tee to split the recirculation pump flow between the recirculation filter section and dosing filter section, a recirculation distribution piping ball valve to isolate the recirculation filter distribution piping for flushing, a recirculation distribution piping network covering the recirculation filter section, recirculation piping orifices, and a recirculation distribution piping flush valve to allow flushing of said piping back into the recirculation pump chamber.
9 . The wastewater treatment unit as recited in claim 8 , further comprising recirculation piping orifices that spray wastewater upwards, impacting the top cover of the wastewater treatment unit, aerating said wastewater to provide oxygen to beneficial bacteria in the filter media, and distributing wastewater evenly over the filter bed area.
10 . The wastewater treatment unit as recited in claim 9 , further comprising a recirculation filter section vent, and a dosing filter section vent in the riser section lids, said vents having an outside vent opening open to the atmosphere, and an opening into the recirculation and dosing chamber air spaces above said filter media of the first and second filter layers, wherein the wastewater pumped through said filter distribution piping and spray nozzle assembly is sprayed into said air spaces.
11 . The wastewater treatment unit as recited in claims 6 , further comprising recirculation pump section vent, and dosing pump section vent in riser section lids, said vents having an outside vent opening open to the atmosphere, and an opening into the pump chambers to allow sufficient air for the pumps to discharge water from the respective storage basins.
12 . The wastewater treatment unit as recited in claim 1 , further comprising a porous filter underdrain, the wastewater flowing through said filter media of said first and second filter layers being directed through said underdrain and being directed into the recirculation chamber and the dosing chamber, respectively.
13 . The wastewater treatment unit as recited in claim 1 , further comprising a treated effluent filter on said treated effluent discharge pipe, said effluent filter preventing solids from being discharged from said treatment unit.
14 . The wastewater treatment unit as recited in claim 6 , further comprising a dosing basin level control, said dosing basin level control activating said dosing pump when the level of wastewater in said dosing chamber reaches a predetermined dosing pump activation level.
15 . The wastewater treatment unit as recited in claim 14 , further comprising a dosing pump timer; said dosing pump timer periodically activating said dosing pump, said dosing basin level control disabling activation of said dosing pump when the level of wastewater in said dosing chamber is below a predetermined dosing chamber minimum level, or enabling activation of said dosing pump when the level of wastewater in said dosing chamber is above a predetermined operating level.
16 . The wastewater treatment unit as recited in claim 1 , further comprising a recirculation pump timer, said recirculation pump timer periodically activating said recirculation pump.
17 . The wastewater treatment unit as recited in claim 1 , further comprising a recirculation basin level control, said recirculation basin level control activating said recirculation pump when the level of wastewater in said recirculation chamber reaches a predetermined recirculation chamber maximum level.
18 . The wastewater treatment unit as recited in claim 17 , further comprising a control system including a recirculation basin level control, a recirculation pump timer and a recirculation chamber level alarm; said recirculation pump being activated periodically by said recirculation pump timer; said recirculation pump being activated and said recirculation chamber level alarm being triggered by said recirculation basin level control when the level of wastewater in said recirculation chamber reaches a predetermined recirculation pump maximum level.
19 . The wastewater treatment unit as recited in claim 1 , further comprising a control system including a recirculation basin level control, a dosing basin level control, a recirculation pump timer, a dosing pump timer, a recirculation chamber level alarm, and a dosing chamber level alarm; said recirculation pump timer periodically activating said recirculation pump; said recirculation basin level control activating said recirculation pump and said recirculation chamber level alarm when the level of wastewater in said recirculation chamber reaches a predetermined recirculation chamber maximum level; said dosing pump timer periodically activating said dosing pump; said dosing basin level control activating said dosing pump when the level of wastewater in said dosing chamber reaches a predetermined dosing pump activation level; said dosing basin level control deactivating said dosing pump when a predetermined level of wastewater has been removed from said dosing chamber; said dosing basin level control activating said dosing chamber level alarm when the level of wastewater in said dosing chamber reaches a predetermined dosing chamber maximum level; said dosing basin level control disabling activation of said dosing pump by said dosing pump timer when the level of wastewater in said dosing chamber is below a predetermined dosing pump minimum level, and wherein said control system includes a modem card, said modem card being activated by at least one of said recirculation chamber level alarm and said dosing chamber level alarm; said modem card, when activated, initiating a call to preset phone numbers to notify a responsible person of at least one of said recirculation chamber level alarm and said dosing chamber level alarm.
20 . The wastewater treatment unit as recited in claim 1 , further comprising a tablet chlorinator installed in said dosing chamber, providing chemical chlorine to said treated effluent for disinfection.