wwmt-d1s2.2 water, wastewater and sludge management in wuhan city by gu jianxin

8/3/2019 WWMT-D1S2.2 Water, Wastewater and Sludge Management in Wuhan City by Gu Jianxin

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I . Background



a er s v a o a crea ures anhuman beings. China is a large

coun ry w mos peop e o eworld. However the per capitawa er resource s qu e ess an

many other countries.



•• During the past three decades China hasDuring the past three decades China has

development. However, the deteriorationdevelopment. However, the deterioration

problem day by day, which aggravatedproblem day by day, which aggravated



•• China realized that the sustainableChina realized that the sustainable

the cost of deteriorating environment andthe cost of deteriorating environment and

environment and resources. Theenvironment and resources. The

targets were also promulgated in everytargets were also promulgated in every

“ “ ” ” -- ..



•• There areThere are 28322832 WWTPs in operation withWWTPs in operation with

tons/day by the end of tons/day by the end of 20102010 in China. Thein China. The

quality is seen in many cities and ruralquality is seen in many cities and rural

to be done in order to further improve theto be done in order to further improve the



I I . The Sit uat ion inu an y



West

BeijingBeijing

TianjinTianjin

Xi’an East

Chongqing

Hong KongHong Kong



Yellow Crane Tow er is t he

symbol of Wuhan



Yangt ze River and Han River j oin here.



ang ongang ong anyang ee ompany,anyang ee ompany,

18901890



•• However, the water pollution is occurringHowever, the water pollution is occurring

development and industrialization. Manydevelopment and industrialization. Many

past decades due to lack of sufficientpast decades due to lack of sufficient. ,. ,

only about 7% wastewater was treatedonly about 7% wastewater was treated

..



•• The government realized thatThe government realized thatenvironmental protection was essential toenvironmental protection was essential tothe sustainable development andthe sustainable development and

improvement of living condition for tenimprovement of living condition for tenmillion people of Wuhan.million people of Wuhan.



•• Be innin in the earl ears of 1990s lastBe innin in the earl ears of 1990s lastcentury, Wuhan city made great effort tocentury, Wuhan city made great effort toim rove the wastewater treatment andim rove the wastewater treatment and

infrastructure. The government obtainedinfrastructure. The government obtainedloans from the World Bank the ADB andloans from the World Bank the ADB andother foreign governments and finishedother foreign governments and finished

several wastewater treatment ro ects.several wastewater treatment ro ects.There are twelve wastewater treatmentThere are twelve wastewater treatmentlants in o eration in urban area currentllants in o eration in urban area currentl

and more than 80% of the wastewater isand more than 80% of the wastewater istreated.treated.



•• However, like in other cities, Wuhan isHowever, like in other cities, Wuhan isalso confronted by some difficulties.also confronted by some difficulties.



. ncomp e e ewer ys em

.

wastewater could not be collected and treated properly.

However, based on ractical ex erience, theimplementation of sewer is very difficult and the cost

for improving sewer system is extremely high.



.

After wastewater is collected and treated thesludge disposal rises as another urgent problem.

Thousands tons of sludge produced annually maycause new pollution if not disposed properly.



At present, Wuhan is implementing someprojects financed by the ADB. The first ADB-

financed project began in 2003 and is.

completion. The third one is still ongoing. We

completed, the environment in Wuhan wouldbe better certainly.



.



When we design a WWTP, we usually makecomparison among different treatment processes

consideration of wastewater quality and effluentcriteria reliabilit and stabilit of the technolothe cost effectiveness for both construction and

operation and so on. In Wuhan now, we have ,including AO, AAO, Carrousel Oxidation Ditch, DE

OD and ordinar activated slud e rocess.



There are 13 WWTPs in UrbanThere are 13 WWTPs in Urban

area of Wuhanarea of Wuhan



,,the beach land of Yangtze River, thethe beach land of Yangtze River, the

--

considerations during selection of considerations during selection of ,,

shows that the cost of this process is ashows that the cost of this process is a..

plant has a treatment capacity of 100,000plant has a treatment capacity of 100,000

-- ..hectare according to the National Antihectare according to the National Anti--..

need for normal treatment process.need for normal treatment process.



Besides the land limitation, the authorities

including safety, quality, odor removal,

disinfection system, garden-styled designing.



Finally, the bio-filter process was considered to

e t e most appropr ate tec no ogy or t e o ow ngreasons.

. .

2.Although the construction cost of thistechnolo is relativel hi her it saves the cost

for land acquisition.

3.Bio-filter is a comparatively new technologybut proven successful in other plants.

4.According to the law, this plant must be

. -controlled and needs very little underground



BioBio--filterfilter



BioBio--filterfilter

Biolite

Oxazur

清水池



What’ s more, the bio-filter technology has some features:

(1)It combines two operations in one: biologicalurification and retention of sus ended solids.

(2)High performance aeration, perfect distribution of thefluids and efficient washing could be realized.

.



,

that have know-how of bio-filter, such as, , ,

Tongfang. They all have accomplished

.



•• This WWTP is still under construction,This WWTP is still under construction,..

appraisal stage, it is originally intended toappraisal stage, it is originally intended to--

procedures. Due to the uncertainty thatprocedures. Due to the uncertainty that

approve this project, we hired a designingapprove this project, we hired a designing

approval application.approval application.



•• The implementation of this plant wasThe implementation of this plant wasdivided into three contracts, thedivided into three contracts, thefoundations treatment, the civil works,foundations treatment, the civil works,

and design, equipment supply and install.and design, equipment supply and install.Now the foundations treatment is alreadyNow the foundations treatment is alreadydone. The contractor for civil works isdone. The contractor for civil works is

selected. The bid evaluation report forselected. The bid evaluation report fordesign, supply and install has beendesign, supply and install has beensubmitted to authorities and the ADB forsubmitted to authorities and the ADB for

approval.approval.•• This lant is scheduled to be com leted inThis lant is scheduled to be com leted in

June, 2012.June, 2012.



I V. Sludge Solut ionI V. Sludge Solut ion



•• More and more WWTPs have been putMore and more WWTPs have been put

is then produced. About 700 tons of is then produced. About 700 tons of

solid are generated every day in Wuhan.solid are generated every day in Wuhan.

prevent new pollution caused by sludge, itprevent new pollution caused by sludge, it

enterprises like in other Chinese cities.enterprises like in other Chinese cities.



•• There are many sludge treatmentThere are many sludge treatment, , ,, , ,

utilized as construction material orutilized as construction material or..

under development. Wuhan wastewaterunder development. Wuhan wastewater

had undertaken one researching project tohad undertaken one researching project to..



•• The adoption on sludge treatmentThe adoption on sludge treatment

based on the technical characteristics. Itbased on the technical characteristics. It--

analysis, including technical, economic,analysis, including technical, economic,

conditions as well.conditions as well.



•• ADB is helping Wuhan solve the sludge ADB is helping Wuhan solve the sludge

project. This total investment of thisproject. This total investment of this

100 million USD loan from the ADB. This100 million USD loan from the ADB. This

and sludge disposal.and sludge disposal.



•• The sludge disposal mainly includes threeThe sludge disposal mainly includes threecomponents. The first is Wuchangnan Sludgecomponents. The first is Wuchangnan SludgeTreatment Plant using belt drying process withTreatment Plant using belt drying process withcapac y o ons o ry so s, rom w c ecapac y o ons o ry so s, rom w c e

product could be utilized as soil conditioner orproduct could be utilized as soil conditioner or..

WWTP, where there are two anaerobic digesters.WWTP, where there are two anaerobic digesters.

It could treat 20 tons of dr solids er da andIt could treat 20 tons of dr solids er da andthe product would be used as filling material. Thethe product would be used as filling material. Thethird one is Nantaizihu STP with treatmentthird one is Nantaizihu STP with treatment

capacity of 10 tons dry solids per day, using limecapacity of 10 tons dry solids per day, using limefor stabilization.for stabilization.



•• Besides these components, there isBesides these components, there isanother goal to be achieved by thisanother goal to be achieved by thisproject. That is to help Wuhan set upproject. That is to help Wuhan set up

appropriate and integrated approach toappropriate and integrated approach tofinal sludge solution.final sludge solution.



V. Lessons and ExperienceV. Lessons and ExperienceObtainedObtained



•• During the implementation of severalDuring the implementation of severalprojects, some lessons and experienceprojects, some lessons and experiencewere obtained.were obtained.



•• (1) The good quality of project preparation is very(1) The good quality of project preparation is very

important for good implementation, including integratedimportant for good implementation, including integrated, ,, ,

implementation, efficient procurement arrangement andimplementation, efficient procurement arrangement andso on.so on.



•• (2) A qualified and experienced project management(2) A qualified and experienced project management

team including the consultants is the insurance of team including the consultants is the insurance of ..



•• (3) Propaganda and public anticipation could never be(3) Propaganda and public anticipation could never be

ignored in order to obtain necessary support from theignored in order to obtain necessary support from the..



•• (4) A sound mechanism of tariff should be established to(4) A sound mechanism of tariff should be established to

ensure the full cost recovery and benefits of projects.ensure the full cost recovery and benefits of projects.



•• (5) More funds and attention should be paid to technical(5) More funds and attention should be paid to technical

innovation and practical application.innovation and practical application.



Thank You!

wwmt-d1s2.2 water, wastewater and sludge management in wuhan city by gu jianxin

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