Treatment

Treatment Plant Process

Influent wastewater enters the facility through a 42″ diameter interceptor sewer located on Erie Street. Wastewater then flows through an Aerated Influent Channel, where it is metered by an open-channel Influent Flowmeter, then flows to the Grit and Screenings Building. The wastewater passes through a Mechanical Bar Screen that removes debris and other trash, which may harm the downstream processes. The wastewater then passes through Aerated Grit Channels to remove grit, sand, and other inorganic material from the waste stream. The grit is collected by chain and bucket grit collectors, where it is transported, washed, and dewatered by the Grit Screw Conveyor and discharged into a dumpster for disposal. The wastewater then flows to the Aeration Tank for secondary biological treatment.

Secondary treatment at the facility consists of a three-concentric-channel Aeration Tank followed by settling in the Final Clarifiers. The aeration tank contains a colony of microorganisms, known as “mixed liquor.” These microorganisms convert the biodegradable organic material in the wastewater into carbon dioxide, water, and additional cell material. Rotating discs in the channels provide oxygen to the system necessary to sustain the colony and maintain the activated sludge-wastewater (mixed liquor) mixture in suspension. Varying dissolved oxygen levels in each of the channels provide nitrification as well as organic solids removal. A flow control structure located in the center island of the aeration tank maintains a consistent water depth in the channels. Water Pollution Control Facility

After remaining in contact with the activated sludge for at least 24 hours, the wastewater flows by gravity to the Final Clarifiers for settling. There are two clarifiers, each measuring 75 feet in diameter. Here the activated sludge is separated from the wastewater by gravity settling. Effluent wastewater flows over the weirs to proceed on to disinfection, while the activated sludge is collected in the clarifiers and flows by gravity to a common sludge well located in the Clarifier Building.

Telescoping sludge valves regulate the amount of sludge transported. A portion of the sludge is returned to the aeration tank by the Return Activated Sludge (RAS) Pumps to seed influent wastewater and maintain a healthy microorganism colony. Sludge that is not returned to the aeration tank is removed by Waste Activated Sludge (WAS) Pumps, which pump the wasted sludge to the sludge storage tank for further processing and disposal. Both RAS and WAS Pumps are located in the basement of the Clarifier Building. Grease, scum, and other floatable solids are removed from the clarifiers by scum baffles and surface skimmers and collected in troughs. A Scum Pump Station collects the grease and scum and transports it to the sludge holding tank for further processing.

The effluent from the final clarifiers flow through a 36″ conduit to the Chlorine Contact Tank for disinfection. Chlorine is introduced to the wastewater through diffusers and the chlorine and wastewater remain in contact for a sufficient time to provide bacteriological kill. The chlorine remaining at the end of the tank is then removed by the addition of sulfur dioxide. The disinfected effluent then passes over the Post Aeration Unit for final aeration and is metered by the Final Effluent Metering Flume prior to discharge to Little Yankee Run. Final plant effluent (water) is recycled for process operations to minimize operational costs.

Information provided by WCPF Design Engineers, ms consultants, inc.

News & Alerts!
PUBLIC HEARING Zone Change  When:     Monday, February 6, 2023           Time:       7:00                                          Where:     City Council Chambers                     A public hearing will be held during the council meeting on February 6th...Read More
QUALIFICATIONS:  High school or GED equivalent, plus experience and/or training in the fields of machinery, heavy equipment, automotive/diesel repair and maintenance; or equivalent combination of education, training and/or experience...Read More
The City of Hubbard, Ohio will be accepting resumes for the position of a Class 1 Wastewater Operator with a current Class 1 Operator Certification. Duties include, but are...Read More
The City of Hubbard has an opening on on the Park & Recreation Board.  Volunteering provides an opportunity for citizen participation in the process of government and increase their...Read More
Hubbard City Planning and Zoning will hold an emergency commission meeting on Thursday, November 17, 2022 at 5:00 pm in Council Chambers.
Hubbard City Council will hold a work session on Monday, November 14, 2022 at 5:30 pm in Council Chambers.  They will discuss the 2023 budget.
The Eagle Joint Fire District is looking for a Hubbard City resident to join the EJFD Board of Trustees starting in January 2023.  Resident positions on the board are...Read More
  The City of Hubbard’s annual leaf pick-up program will begin on Monday, October 31, 2022 weather permitting.  The removal crews will begin in the 3rd Ward on Drummond...Read More
SANTA & MRS. CLAUS ARE COMING TO TOWN CHRISTMAS PARADE – SATURDAY, DECEMBER 3, 2022 The parade committee is inviting any business, church, school, organization, or political affiliation who...Read More
Public notice is hereby given by the Civil Service Commission of Hubbard, OH of a competitive examination for the position of Full-Time Police Officer. Applications must be made on...Read More
The City of Hubbard, Ohio will be accepting resumes for the position of a Class 1 Wastewater Operator with a current Class 1 Operator Certification. Duties include, but are...Read More
  The City of Hubbard is now accepting applications for seasonal / part-time leaf rakers at $12 per hour.  Applications can be obtained by clicking the link below or...Read More
The City Transformation Team of Hubbard (Police Chaplains) has established a support group devoted solely to the task of walking alongside friends and families of those struggling with substance...Read More
Events
Calendar
Mon
Tue
Wed
Thu
Fri
Sat
Sun
M
T
W
T
F
S
S
30
31
1
2
3
4
5
6
8:00 AM - Civil Service
6:30 PM - City Council
7
8
9
10
11
12
15
16
17
18
19
20
8:00 AM - President's Day
22
23
24
25
26
27
28
1
2
3
4
5
31 Jan
01/31/2023    
9:00 am - 9:30 am
Will meet at 9:00 a.m. as needed in the Mayor's Conference Room.
06 Feb
02/06/2023    
8:00 am - 9:00 am
Will meet as needed at 8:00 a.m. in Mayor's Conference Room.    
06 Feb
02/06/2023    
6:30 pm - 8:00 pm
Will meet in regular session at 7:00 p.m.  (Caucus at 6:30p.m.) in council chambers.
07 Feb
02/07/2023    
9:00 am - 9:30 am
Will meet at 9:00 a.m. as needed in the Mayor's Conference Room.
13 Feb
02/13/2023    
7:00 pm - 8:00 pm
Will meet at 7:00 p.m. in council chambers. Any business should be submitted to the Chairman at least one week prior to the meeting.  NOTE: [...]
14 Feb
02/14/2023    
9:00 am - 9:30 am
Will meet at 9:00 a.m. as needed in the Mayor's Conference Room.
14 Feb
02/14/2023    
7:00 pm - 8:00 pm
Will meet at 7:00 p.m. in council chambers.  NOTE: THE BOARD WILL MEET ONLY WHEN THERE ARE VARIANCES TO CONSIDER.
20 Feb
02/20/2023    
8:00 am - 4:00 pm
The City Administration Building will closed in observance of President's Day - we will re-open on Tuesday, February 21, 2023.
21 Feb
02/21/2023    
9:00 am - 9:30 am
Will meet at 9:00 a.m. as needed in the Mayor's Conference Room.
21 Feb
02/21/2023    
6:00 pm - 7:00 pm
Will meet at 6:00 p.m. in council chambers.
21 Feb
02/21/2023    
6:30 pm - 8:00 pm
Will meet in regular session at 7:00 p.m.  (Caucus at 6:30p.m.) in council chambers.
28 Feb
02/28/2023    
9:00 am - 9:30 am
Will meet at 9:00 a.m. as needed in the Mayor's Conference Room.
Events on 01/31/2023
31 Jan
31 Jan 23
Hubbard
Events on 02/06/2023
06 Feb
6 Feb 23
Hubbard
06 Feb
6 Feb 23
Hubbard
Events on 02/07/2023
07 Feb
7 Feb 23
Hubbard
Events on 02/13/2023
13 Feb
13 Feb 23
Hubbard
Events on 02/14/2023
14 Feb
14 Feb 23
Hubbard
14 Feb
Events on 02/20/2023
20 Feb
20 Feb 23
Hubbard
Events on 02/21/2023
21 Feb
21 Feb 23
Hubbard
21 Feb
21 Feb 23
Hubbard
21 Feb
21 Feb 23
Hubbard
Events on 02/28/2023
28 Feb
28 Feb 23
Hubbard
Mon
06
Civil Service
Feb 06 @ 8:00 am - 9:00 am
Contact

City of Hubbard
Municipal Building

220 West LIberty Street
Hubbard, OH 44425
P 330.534.3090
F 330.534.8441

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