Commercial Onsite Sewage Systems - Zoning Pressurized Effluent Dispersal Systems

Commercial On-siteSewage Systems

Design Options for Large Pressure Dosed, Effluent Dispersal Systems

By: Kelly Galloway, P.Eng.@DynamicMonitors

Commercial On-site Sewage SystemsDesign Options for Large Pump Dosed Systems

There are many types of Land Based Effluent Dispersal (LBED) systems which can be used for (large) non-residential facilities:

• Conventional gravel drainfields

• Leaching chamber drainfields and beds

• Other Alternative Media Trench and Bed Systems

• Subsurface Drip Irrigation (SDI) and spray irrigation

• Mounds and at-grade systems

• Low pressure pipe

• These systems usually require pressure distribution to achieve uniform distribution and effective utilization of the entire effluent dispersal system.

• Full pressure distribution (as opposed to siphon dose, or pump to D-box) is often a regulatory requirement for large LBED systems.

• Micro-dosing usually requires timer operated pumps to deliver very small doses. This prevents saturation and encourages proper treatment with sand filters, and other types of packed-bed filters.

Commercial On-site Sewage SystemsDesign Options for Large Pump Dosed Systems

• Engineers/designers have several different techniques & technologies available in their tool kit.

• Each option has pros & cons and implications for:

– Cost of equipment

– Ease of maintenance

– Ease and cost of future system expansion

– Level of mechanical and electrical complexity

– Reliability and redundancy, “failsafe features”

Commercial On-site Sewage SystemsDesign Options for Large Pump Dosed Systems

• The dispersal or treatment system can be divided up into several smaller subsections, referred to as cellsor zones.

• Each zone can then be pressure dosed individually.

• This has several benefits for the design, maintenance and future expansion of the system.

• Different methods of zoning a large pressurized effluent dispersal system are presented in the following slides.

Commercial On-site Sewage SystemsDesign Options for Large Pump Dosed Systems

OPTION #1 – Large HP Pumps

•Heavy pumps - need guide rail and lifting systems•Expensive wet well•O&M more difficult•Major wet well and pumping system upgrades to expand•Increased cost ($$$)•No redundancyif pump fails

P3P2P1

Large,High HPpumps

ON-SITE SEWAGE SYSTEM ZONING DESIGN COMPARISON

P2 P3 P4 P5 P6

OPTION #2 - Multiple Pumps

•4 pumps needed for Phase 1•2 more pumps needed for Phase 2 expansion•Pump tank may need upgrades for Phase 2•No redundancy if a pump fails (unless double # pumps)•Increased pump control panel size/complexity•Increased cost ($$)

P1Multiple pumpsused for zoning

ON-SITE SEWAGE SYSTEM ZONING DESIGN COMPARISON

P1 P2

solenoidvalves

solenoidvalve

OPTION #3 – Solenoid Valves

•Solenoid valves are prone to fouling with septic tank effluent•No cost effective means to alert solenoid valve failure•No zone redundancy if solenoid valve fails•Increased electrical and control panel complexity•Increased cost ($$)

ON-SITE SEWAGE SYSTEM ZONING DESIGN COMPARISON

OPTION #4 – Distributing Valve + IVM6000 Monitor

•Only 2 pumps needed•No upgrades to pumping system needed for Phase 2•Just change distributing valve from 4 zones to 6 zones•Simpler control panel•System can operate at full capacity, even if a pump fails•Most cost effective

P1

P2

ON-SITE SEWAGE SYSTEM ZONING DESIGN COMPARISON

Dist. Valve+ IVM6000

Distributing Valve + IVM6000 Monitor

•Only 2 pumps needed•No upgrades to pumping system needed for Phase 2•Just change indexing valve from 4 zones to 6 zones•Simpler control panel•System can operate at full capacity, even if pump fails•Most cost effective

P1 P2

DISTRIBUTING VALVE + IVM6000 MONITOR FOR ZONINGTREATMENT MODULES TOO!

Introducing the first electronic monitor and early-warning alert system for all 6000 series distributing valves (2, 3, 4, 5, 6 outlets)

IVM6000-LPTM Intelligent Valve MonitorTM

Confirms even distribution to all sewagesystem zones and provides early detectionand immediate alert of valve malfunctions.

100% detection of uneven distribution caused by:

• Faulty installation• Debris inside valve• Broken stem spring• Inadequate flow• Siphoning through valve

•Pump/control panel problems• Wrong cam or broken cam• Back pressure on valve• Freezing of valve or piping• Air pockets

10 min. install orretrofit on valve!

The IVM6000-LPTM ensures reliable designs and peace of mind, by confirming even distribution to all zones.

Slide the monitor down over the valve, supply low voltage power, and connect the alarm output to the control panel.

The IVM6000-LPTM ensures reliable designs and peace of mind, by confirming even distribution to all zones.

The IVM6000-LPTM is ready to provide early detection and immediate alert of any valve malfunctions.

We develop convenient & innovative products which make decentralized wastewater systems more effective, affordable & easier to maintain.

Please contact us for assistance with the design of a zoned sewage system using mechanical distributing

(indexing) valves and the IVM6000 monitor.

[email protected] (SOIL)