PUBLIC INFORMATION CENTRE May 29, 2017 MUNICIPALITY OF BRIGHTON

Transcription

1 PUBLIC INFORMATION CENTRE May 29, 2017 MUNICIPALITY OF BRIGHTON Brightn Wastewater Treatment System Schedule B Municipal Class Envirnmental Assessment Welcme! Please Sign In.

2 PROJECT LOCATION AND OVERVIEW Several kilmetres f gravity cllectin sewers Pumping Statins: One main pumping statin n Harbur Street One small pumping statin at Presqu ile Park Apprximately half f the sewage generated is directed t the Harbur Street Sewage Pumping Statin and pumped via frcemain t the lagn and the ther half flws by gravity directly t the lagn Figure 1 Brightn Wastewater Cllectin System

3 BRIGHTON LAGOON TREATMENT SYSTEM A wastewater treatment system cnsisting f: A pre-aeratin lagn cell (0.68 ha) A single facultative stabilizatin lagn cell (5.44 ha) A cnstructed wetland (6.2 ha) A chemical strage/feed system Figure 2 Brightn Lagn Treatment System Site Plan Brightn Lagn Treatment System is: A cntinuusly perated system that discharges year-rund Currently rated fr 4,600 m 3 /d average day flw A Class 1 treatment facility perating under the MOECC ECA N XQNZK Histrically perating at abut 60-70% f its rated average day flw capacity

4 PURPOSE OF THIS STUDY T evaluate the Brightn Wastewater System and t identify what is required fr it t perfrm effectively and in accrdance with regulatins ver a 20 year planning perid. SUMMARY OF PROBLEM / OPPORTUNITY STATEMENT Difficulties have been experienced in meeting effluent quality cmpliance criterin and bjectives, particularly fr ammnia and phsphrus The existing wastewater treatment system struggles with perfrmance smetimes as a result f: Relatively high rganic lading (e.g. Ammnia) Ptential hydraulic shrt circuiting in the lagn Limited retentin time in the lagn Sludge accumulatin Lack f a dedicated nitrificatin prcess fr ammnia remval The Cnstructed Wetland is nt prviding significant additinal treatment Aging infrastructure at the Harbur Street Sewage Pumping Statin and the lagn requires upgrades t maintain the apprpriate level f service. It has been determined that the current Envirnmental Cmpliance Apprval (ECA) rated hydraulic capacity des nt need t increase fr the next 20-year planning hrizn.

5 PHASE 1 PROBLEM AND OPPORTUNITY STATEMENT The Brightn cmmunal sewage system generally cnsists f several kilmeters f gravity cllectin sewers, a main pumping statin, a smaller sub-area pumping statin and a cntinuusly discharged lagn based treatment system that includes an aeratin cell, a waste stabilizatin pnd, a cnstructed wetland and a cntinuus chemical feed system fr phsphrus remval. The treatment system is currently licensed under Envirnmental Cmpliance Apprval (ECA) N XQNZK which stipulates certain peratinal and perfrmance requirements. The system currently services an estimated ppulatin f 6,462 and sme ppulatin grwth is prjected t ccur within the 20-year planning perid that will generate additinal flws and increase hydraulic lading t the treatment system. The system is currently nly perating at apprximately 60% t 70% f its ECA rated hydraulic capacity. Based n an evaluatin f the available peratinal histrical treated effluent data, it has been determined that the treatment system has regular difficulties in achieving the effluent quality required by ECA N XQNZK, particularly fr ammnia and in sme cases Ttal Phsphrus. A review f histrical raw sewage quality, hydraulic input and the verall physical cnfiguratin f the Lagn based treatment system, indicates that the relatively high strength raw sewage cmbined with physical limitatins f the treatment system is the primary cause fr the treated effluent exceedances. The system, as currently cnfigured, is nt capable f treating the rganic ladings received frm the cllectin system. Further the cnstructed wetland prtin f the treatment system is nt prviding any significant treatment with respect t the parameters f cncern. In additin, the Harbur Street SPS and the Lagn based treatment system were evaluated as part f Phase 1 f the Class EA. Due t the age and cnditin f the existing infrastructure, within the next 7 years apprximately $500,000 in infrastructure rehabilitatin and maintenance is required.

6 OVERVIEW OF THE SCHEDULE B CLASS EA PROCESS We are here

7 THE MUNICIPAL CLASS EA PROCESS What is a Municipal Class Envirnmental Assessment? A self-assessment prcess by which municipal infrastructure prjects will be planned in accrdance with the Envirnmental Assessment Act The Class EA prvides fr: the identificatin f prblems r pprtunities; the identificatin, evaluatin and selectin f a preferred means f addressing the prblems r pprtunities, giving due regard t the need t prtect the envirnment and minimize envirnmental effects; and ding the freging with the invlvement f affected stakehlders in the decisin-making prcess

8 THE MUNICIPAL CLASS EA PROCESS Municipal Prjects can invlve: Rad Prjects Transit Prjects Water Prjects Wastewater Prjects Prjects have varius levels f cmplexity: Schedule A prjects are limited in scale and are pre-apprved. They have minimal adverse effects and ften invlve nrmal and maintenance activities Schedule A+ prjects are pre-apprved with public ntificatin. Schedule B prjects have the ptential fr sme adverse impacts. There is mandatry cntact with public and review agencies t ensure they are aware f the prject and that their cncerns are addressed. Schedule C prjects have the ptential fr significant adverse impacts. There is mandatry full screening prcess including filing f an Envirnmental Study Reprt (ESR) Generally fr cnstructin f new facilities and majr expansins (ie. New Mechanical Sewage Treatment Plant)

9 SUMMARY OF WORK COMPLETED AS PART OF THIS CLASS EA Technical review f existing Brightn Wastewater System and histric perating data Site reviews f existing infrastructure Ppulatin and flw prjectins fr 20-year planning perid Cnsultatin with review agencies and public Special cnsultatin with the Ministry f the Envirnment and Climate Change (key agency fr this prject) Preparatin f a Class EA Phase 1 Reprt Identificatin f all ptins fr lng-term needs f the system Detailed evaluatin f ptins, including btaining technlgy prpsals frm suppliers Preparatin f a Class EA Phase 2 Reprt A Public Infrmatin Centre Incrprate cmments, finalize dcumentatin and cnfirm preferred alternatives Issue 30-day Ntice f Cmpletin T Be Cmpleted

10 IDENTIFICATION OF ALTERNATIVE SOLUTIONS All ptins were evaluated against their impact t the natural, scial, technical and ecnmic envirnment. The impact fr each criterin relative t each ptential slutin was assessed and evaluated. Key cnsideratin was given t whether the ptin addresses the existing prblem and cnditins. Capital O&M Cst ECONOMIC SOCIAL Visual Cnstructin Impact Operatin Impact NATURAL Archaelgy Aquatic Wildlife TECHNICAL Cld Climate Effluent Quality O&M Expandability OPTION DESCRIPTION EVALUATION 1 D Nthing Effluent cntinues t exceed cmpliance limits Negative effect n the envirnment Existing prblem nt addressed 2 Optimize and Mdify Current Lagn Operatin a. Remve sludge frm lagns b. Optimize and upgrade existing baffles c. Mdify lagn perating vlume and aeratin d. Optimize alum dsage fr phsphrus remval e. Upgrade and refurbish the cnstructed wetland f. Investigate and divert high strength wastewater stream frm lagn 3 Install Specialized Treatment System t Cmplement Existing Lagn System Varius ptimizatin and mdificatin measures identified nt sufficient t address the existing effluent quality issues These measures shuld be carried frward in additin t the preferred slutin fr imprved perfrmance Meets effluent design and cmpliance limits Addresses existing cnditins and cnstrains Mdest capital, peratin and maintenance csts 4 New Mechanical Treatment Plant Imprved treatment perfrmance High capital, peratin and maintenance csts * RECOMMENDED PREFERRED SOLUTION (WITH MODIFICATIONS TO EXISTING LAGOONS)

11 DESCRIPTION OF THE RECOMMENDED PREFERRED SOLUTION 1. Installatin f a specialized treatment system, either upstream r dwnstream f the lagn, t cmplement the treatment perfrmance f the existing facility and t target ammnia remval 2. Lifecycle upgrades at Harbur Street Pumping Statin and Lagn 3. Varius ther upgrades t the existing facility, including: De-sludge the existing lagn Enhance baffling in the stabilizatin lagn Optimize chemical dsage Refurbish the cnstructed wetland Further investigate reasns fr high strength wastewater Opinin f Prbable Csts fr the Recmmended Preferred Slutin: $6,500,000 (including engineering and cntingency, excluding HST)

12 EXAMPLES OF AVAILABLE SPECIALIZED TREATMENT TECHNOLOGIES Optin A: Cmplete Mix Activated Sludge Prcess Optin B: Submersible Aerated Bi film Reactr Optin C: Submerged Attached Grwth Reactr Install within the existing aerated lagn Suspended grwth envirnment fr bimass Aeratin and mixing prvided by blwers and diffusers Prven technlgy in cld climate Reliable perfrmance with n new tankage r building Optin D: Fixed Film Bilgical Prcess (Upstream) Install the new system within the stabilizatin lagn Attached grwth envirnment fr bimass Very limited installatin in cld climate Expensive capital investment Optin E: Fixed Film Bilgical Prcess (Dwnstream) Install new tankage dwnstream f the wetland New tankage t huse attached grwth reactrs Upgrade aeratin system in aerated and stabilizatin lagns Prven technlgy in cld climate High quality effluent Optin F: Activated Sludge with Membrane Technlgy New treatment tanks in part f aerated lagn Existing lagns acts as clarifiers t plish effluent Prven technlgy in cld climate New treatment tank dwnstream f the stabilizatin lagn Prven technlgy in cld climate A cmbinatin f activated sludge prcess and membrane technlgy New treatment tank within aerated lagn Prvides highest level f treatment Mst expensive capital investment

13 EXAMPLE CONCEPT OPTION E Fixed Film Bilgical Prcess (MBBR) Dwnstream f Lagns Targets ammnia remval in the lagn effluent t meet cmpliance requirements Small ftprint Very limited peratin and maintenance requirements Easily expandable in the future (if required) Prven technlgy in cld climate Least intrusive t existing site layut Figure 3 Future Brightn Lagn Treatment System Cnceptual Layut

14 NEXT STEPS CURRENT TASKS Obtain and evaluate public, stakehlders and agency cmments and cnfirm the preferred slutin Issue Schedule B Class EA Prject 30-day Ntice f Cmpletin and advise public and stakehlders Fllwing the 30-day public review perid, finalize Class EA dcuments FUTURE TASKS Prceed t preliminary and detailed design and prject implementatin Estimated schedule t implement the recmmended slutin: Design Phase: 8 t 12 mnths Cnstructin Phase: 12 t 18 mnths

15 THANK YOU! Yur Cmments are Imprtant t Us YOUR COMMENTS WILL BE CONSIDERED IN THE FINAL ASSESSMENT AND EVALUATION OF THE PREFERRED SOLUTION Onging infrmatin abut this prject can be fund at