s4 integrated and decentralized sewage sludge management in wuhan, prc by arnaud heckmann

8/6/2019 S4 Integrated and Decentralized Sewage Sludge Management in Wuhan, PRC by Arnaud Heckmann

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MAKING SANITATION EFFECTIVEIntegrated and Decentralized Sewage Sludge

Management in Wuhan Municipality, PRC

Arnaud HeckmannUrban Development Specialist, EASS, ADB

2nd ADB – DMC and Partners Sanitation Dialogue23-25 May 2011



• To present policy dialogue to improve sludgemanagement scheme• To present the design and special features

of the Project

Presentation Object ives

Presentation Summary

(i) Background(ii) Policy dialogue and Project proposal(iii) Project design and Sustainable features

MAKING SANITATION EFFECTIVE

In tegr ated and Decent r a l i zed Sew age Sludge Management in Wuhan Munic ipa l i t y



Background – Wuhan Ci t y

Capital of Hubei Province – 8.7 million inhabitants

Population of 3.5 million in the dense urban core

5th largest City in the PRC in term of populationand economy





… No adequate s ludge t rea tment in f rast r uc t u res

Background – 85% of the wastewater treated but…

11 WWTPs generating 657 tons o f sew age s ludge per day ; Sanitary landfill capac i t y satu ra ted ; Pathogen elements po l lut ing the env ironment ; No exper ience in sludge treatment and disposal.

Common situation in PRC

Original sludge master plan promoting centralizedtreatment and incineration





Various issues identified

• Safety and security issues due to lack of experienceand regulation• Operational problem• Long distance transportation: a urban and

environmental challenge• Not complying with ADB agenda on climate change• Low public acceptance

Policy Dialogue – Orig inal Proposal Assess m ent



• Stringent sludge testing to confirm technical routefor sludge disposal and reuse• Cost effective and sound technical proposal togain public and wastewater community acceptance• Wuhan objective to be recognize as a model City

• Long term partnership between ADB and WuhanMunicipality

Support for policy dialogue





Policy Dialogue – Proposal Reor ientat ion

Objectives

• Establish guiding principles for the City sludge

master plan• Integrated approach based on sludge digestionand sludge drying adapted to the local situation

• Introduction of advanced and adaptedinfrastructure design

• Promote best practices in waste management

and circular economy for waste used as sourceof energy and/or reuse as material



The Proposal – Summary

STP Location Treatment Technology Design Capacity Sludge DisposalScheme

WuchangnanSTP

Tangxunhu WWTP

Drying by steam suppliedfrom an adjacent power

plant

40 tons DS/day Soil conditioners,filling material

Hankou STP SanjintanWWTP

Drying by capturingbiogas from anaerobic

digesters and limestabilization as back-up

20 tons DS/day ofdrying, and 10tons DS/day of

lime stabilization

Composting, soilconditioners, earth

fill

Nantaizihu STP Nantaizihu WWTP

Lime stabilization 10 tons DS/day Land remediation:Tang Mountain

Rehabilitation as soilconditioner, earth fill

Improvementof existing

WWT/sludgetreatment andtransportation

AllWWTPs

Modification or newequipment for sludge

handling, storage,analysis and transport ,WWTPs operation etc

Meeting eachWWTP’s design

capacityrequirements

Improved equipmentwill enhance the

efficiency of sludgemanagement

• 3 Sludge Treatment Plants built on site• 50% of the Wuhan city’s sludge production, that is 350tons/day of sludge (70 tons DS/day), will be treated anddisposed

• Project pioneers the comprehensive management andbeneficiary reuse of the sludge

• Optimization of WWPTs operation and management

• Implementation of key sustainable features





Upst ream m easures – Sludge quality improvement…



Pol lut ion Contro l

WWTPs performance

Opt imizat ion

Operation improvement and enhancement ofsewer system Improvement of effluent parameter (especiallysand content reduction)

Control at source to avoid heavy metal andtoxic substances Enforcement and compliance with industrialpretreatment

... for more adapted technical solution and broader disposal solution



Infrastructure Design – In t egr ated and Dec ent r a l ized…



Close-loop pl anning

On-si t e solut ion

Practical and adapted solution Capture urban environment features Seek for neighborhood solution Better community awareness

Low impact development Greater resilience and adaptability to changes Mitigation of transport nuisance Better catchment pollution control

Greater adaptation to change

... to generate socio-economic and environmental benefit through local solution



Susta inabi l i t y – Key features



In tegra ted tar i f f

management

On t im e

moni tor ing

Capac i t y bu i ld ing

and Aid

ef fec t iveness

Comprehensive cost calculation (cap.Inv.,

Service life, annual op. cost) … … computed in sludge tariff and integrated inwastewater tariff Phased adjustment plan to achieve full costrecovery

Provision of laboratory instrument for on-siteand on-time testing Better transparency On time action for back-up option

Provision for capacity building

Two steps technical assistance package

Publ ic Educ at ion Public awareness to gain public acceptanceon tariff and sludge reuse School curriculum



Sub-components Description - 3 Sludge Fac i l i t ies





THANK YOU

s4 integrated and decentralized sewage sludge management in wuhan, prc by arnaud heckmann

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