top of page


Achieve Environmental and Economic Sustainability!

Environmental Engineering

Pleasant Mount Welding, Inc.'s Environmental Equipment Division can provide Sequencing Batch Reactors from their custom design and engineering to the fabrication of the tanks. PMWI’s SBRs provide state of the art, proven modern wastewater treatment for municipal, commercial and industrial wastewater flows. A sequencing batch reactor is an activated sludge process where various water treatment events occur in the same tank. These SBRs provide an economical wastewater treatment system, reducing energy requirements and the necessity of the addition of chemicals over conventional treatment systems.


PMWI’s systems come complete with fabricated structural steel tankage, blowers, controls, pumps and any additional equipment required to meet your specific treatment requirements. PMWI’s modular systems are prefabricated to allow for ease of installation based on your specific treatment and site requirements. With their capabilities of nitrogen and phosphorous removals PMWI SBRs are ideal for building new or retrofitting older communities WWTPs for complying with the Chesapeake Bay Biological Removal Requirements.

These reactions all occur in the same tank(s) and are sequenced according to the time required for each phase. The programmable SBR control panel automatically controls the 5 process steps. The control panel is designed so that time for each step may be easily adjusted in the field to adapt quickly to unexpected change in the conditions of either organic or hydraulic loads. This operational flexibility, unique to the SBR Process, insures future compliance with design performance even if the wastewater characteristics change. This SBR Process flexibility also guarantees maximum effectiveness in advance wastewater treatment, i.e., the biological removal of nitrogen and phosphorous. The key to this cost-effective method of nutrient removal is the inherent ability of the SBR system to easily provide anaerobic, anoxic, and aerobic conditions for the groups of micro-organisms selected for nitrogen and phosphorous removal.

SBR Process












Wastewater is pumped into the tank until a certain amount of mixed liquor is in the reactor.


Treatment begins under controlled conditions to remove the required nutrients (carbon, nitrogen, & phosphorus). The control is air to produce anaerobic, anoxic, or aerobic conditions.


Treatment is then halted to allow for the sludge floc to settle to the bottom of the tank. 


A decanter mechanism is lowered into the water to remove the treated clarified supernatant without disturbing the mixed liquor blanket.


The idle period is time between completion of decant and beginning of fill. This occurs when actual flows are less than design flows.

SBR Case Studies - Success Stories


Case #1: Success Story

Wastewater Treatment Plant SBR Retrofit

Greenfield Township Sewer Authority (GTSA) WWTP in Pennsylvania

By installing an SBR and eliminating final clarifiers with return and waste sludge equipment, the GTSA saved over $2 million in project construction costs.

The upgraded PMWI SBR wastewater treatment system allows the plant to handle storm flows while meeting the State's stringent effluent requirements for ammonia and phosphorus.

Case #2: Success Story

New Wastewater Treatment Plant SBR Installation

Benton-Nicholson Joint Sewer Authority (BNJSA) WWTP in Pennsylvania

This facility was monitored for two years to evaluate compliance with the total nitrogen discharge limits set by the Chesapeake Bay Biological Nutrient Removal requirements. It met or exceeded those limits without any chemical addition.


The BNJSA saved over $1 million by not having to construct clarifiers and related equipment.


Case #3: Success Story

Wastewater Treatment Plant Rehabilitation

Hartford Township Wastewater Treatment Plant in Pennsylvania

The Hartford Township's existing Wastewater Treatment Facility is in the process of being completely rehabilitated to function using modern SBR technology from Pleasant Mount Welding, Inc. 

This rehabilitation will eliminate the existing Extended Air Activated Sludge WWTP which cannot meet the new Chesapeake Bay nutrient removal requirements on its own. It will be replaced with a new PMWI SBR capable of total Nitrogen and Phosphorus removal. 


Copyright © 2020 Pleasant Mount Welding, Inc.

45 Dundaff Street

Carbondale, Pa 18407

Phone: 570-282-6164

bottom of page