Surface Water Treatment Plant Solids Handling Project

The Surface Water Treatment Plant has three (3) lagoons that were designed to be temporary storage of the sludge produced from the river silt and the chemical coagulant. As the chemical coagulant has changed over time, the characteristics of the sludge have also changed, leading to a fluffier, less concentrated sludge taking up more volume. The Ardurra Group was hired to prepare the design, engineering plans and specifications for the solids handling improvements at the Surface Water Treatment Plant that would allow the sludge to be thickened and caught prior to going to the lagoons. This will allow the plant to reuse some of the water it loses through backwash water and desludging the clarifiers. The project entails the construction of several new facilities at the Surface Water Treatment Plant. Behind the existing holding basin, a sludge thickener will be constructed. The sludge produced by the clarifiers is too thin for any of the sludge removal processes without first being thickened. This basin will be like a clarifier where the sludge will be routed there and excess water allowed to decant off the top of the structure and collected for return water. A polymer addition system will also be built. When the sludge gets high enough in the thickener, the operator will turn on the pumps to remove the sludge. It will be injected in the line with a polymer and be discharged into a series of dewatering boxes. This will allow the sludge to be caught. Water removed from the sludge in this gravity fed dewatering plan will be captured in a lift station where it can be returned to the head of plant either by way of a lagoon or through the holding basin directly. This project also makes changes to the holding basin, opening the five chambers to each other, controlled by a valve. This project will allow the sludge to be captured prior to going to the lagoons. It will then be removed from the site by being hauled to the landfill.

Division 02 -	Existing Conditions, Geotechnical Investigations, Subsurface Drilling and Sampling.
Division 03 -	Concrete, Concrete Reinforcing, Cast-in-Place Concrete, Precast Concrete.
Division 04 -	Masonry, Unit Masonry.
Division 05 -	Metals, Structural Metal Framing.
Division 06 -	Wood, Plastics, and Composites, Rough Carpentry.
Division 07 -	Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection, Weather Barriers.
Division 08 -	Openings, Doors and Frames, Windows, Hardware, Glazing.
Division 09 -	Finishes, Flooring, Painting and Coating.
Division 10 -	Specialties, Signage, Safety Specialties, Lockers, Flagpoles.
Division 11 -	Equipment, Laboratory Equipment.
Division 12 -	Furnishings.
Division 13 -	Special Construction.
Division 14 -	Conveying Equipment, Lifts.
Division 21 -	Fire Suppression, Fire-Extinguishing Systems.
Division 22 -	Plumbing.
Division 23 -	Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution, Air Terminal Units.
Division 26 -	Electrical, Instrumentation and Control for Electrical Systems, Power Distribution Units, Lighting, Interior Lighting, Emergency Lighting, Exterior Lighting.
Division 27 -	Communications, Data Communications, Audio-Video Communications.
Division 28 -	Electronic Safety and Security, Electronic Access Control and Intrusion Detection, Video Surveillance, Fire Detection and Alarm.
Division 31 -	Earthwork, Site Clearing, Grading, Earthwork Methods.
Division 32 -	Exterior Improvements, Flexible Paving, Curbs, Gutters, Sidewalks, and Driveways, Fences and Gates, Irrigation, Planting, Turf and Grasses.
Division 33 -	Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Disinfecting of Water Utility Distribution, Water Utility Storage Tanks, Wastewater Utility Pumping Stations, Storm Drainage Utilities, Electrical Utilities, Communications Utilities.
Division 40 -	Process Integration, Water Process Piping, Instrumentation and Control for Process Systems.
Division 41 -	Material Processing and Handling Equipment, Bulk Material Processing Equipment, Bulk Material Conveying Equipment, Bulk Material Feeders, Conveyors, Cranes and Hoists.
Division 44 -	Pollution and Waste Control Equipment, Odor Treatment Equipment, Water Pollution Control Equipment, Water Pollution Containment and Cleanup Equipment.
Division 46 -	Water and Wastewater Equipment, Common Work Results for Water and Wastewater Equipment, Water and Wastewater Preliminary Treatment Equipment, Water and Wastewater Chemical Feed Equipment, Water and Wastewater Clarification and Mixing Equipment, Water and Wastewater Secondary Treatment Equipment, Water and Wastewater Advanced Treatment Equipment, Water and Wastewater Residuals Handling and Treatment.