Nitr oge n r e moval dur ing the tr e atme nt of waste wate r - - PowerPoint PPT Presentation

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Nitr oge n r e moval dur ing the tr e atme nt of waste wate r and landfill le ac hate in a BAF G.D. Jo jo a -Unig a rro , S. Go nz le z-Ma rtne z I nstitute o f E ng ine e ring Na tio na l Unive rsity o f Me xic o I NT RODUCT I

SLIDE 1

Nitr

ge n r

e moval dur ing the tr e atme nt of waste wate r and landfill le ac hate in a BAF

G.D. Jo jo a -Unig a rro , S. Go nzá le z-Ma rtíne z

I nstitute o f E ng ine e ring Na tio na l Unive rsity o f Me xic o

SLIDE 2

I NT RODUCT I ON

L e a c ha te fro m la ndfills a re c o mple x mixture s o f ino rg a nic sub sta nc e s, he a vy me ta ls, a mmo nia nitro g e n, b io de g ra da b le a nd re c a lc itra nt o rg a nic c o mpo unds, whic h a re a pro duc t o f pre c ipita tio n, pe rc o la tio n, c o mpa c tio n a nd de g ra da tio n o f so lid wa ste s Bor do ponie nte landfill Obje c tive T his wor k e valuate s the c ombine d tr e atme nt of old le ac hate fr

m Me xic o City’s lar

ge st landfill with synthe tic waste wate r using a pilot biologic al ae r ate d filte r

Clasific ation BOD/ COD

Old 0.05-0.2 Ma dure 0.2-0.4 Yo ung 0.4-0.6

(Re no u e t a l. 2009)

SLIDE 3

ME T HOD

Pilo t filte r a nd filte r me dia

100 cm 90 cm 15 cm

Air Influent

Backwashing water

Effluent O2 probe Pilot filter characteristics Filter media characteristics Total height 1.90 m Average particle size 9.0 mm Internal diameter 0.15 m Specific area 427 m2/m3 Effective volume 9.02 L Apparent porosity 51 % Filter bed depth 1.0 m Total surface area 7.7 m2

T he pilo t filte r L a va sto ne s with 9.0 mm a ve ra g e size .

SLIDE 4

E xpe rime nta l sta g e s a nd o pe ra tio n c o nditio ns

Stages OLR g/m2·d Leachate v/V COD mg/L NH4-N mg/L PO4-P mg/L 1 9.0

1050

90 45 2 5.0

60 30 3 3.0

30 15 4 3.1 1% 361 37 17 5 3.2 3% 372 44 19

Continuous flow
Waste wate r

flow: 66 L / d

Hydr

aulic r e te ntion time (HRT ): 3.7 h

flow: 2 L / min

SLIDE 5

Synthe tic wa ste wa te r a nd le a c ha te

CODT 1408 mg/L BOD 150 mg/L BOD/ CODT 0.1 Kjeldahl nitrogen 818 mg/L NH4-N 731 mg/L PO4

3--P

163 mg/L pH 8.5

The synthetic wastewater is a mixture of maltodextrin, hydrolyzed protein from sorghum and inorganic nutrients and micronutrients.

Element Unit (mg/L)

Silver ND Aluminum 0.0624 Arsenic ND Barium 0.23860 Cadmium ND Chrome 0.16340 Mercury 0.000992 Lead ND Selenium ND Molybdenum 0.04780 Nickel 0.22290 Manganese 0.2509 Iron 1.95600 Copper 0.05850

Ge ne r al c omposition of le ac hate

SLIDE 6

RE SUL T S

COD re mo va l

200 400 600 800 1000 1200 30 60 90 120 150 180 210

COD (mg/L) Time (d)

OLR: 3.0 Influent Efluent Total COD Soluble COD OLR: 8.1 OLR: 5.3

Lix: 1% Lix: 3%

Start‐up Change of backwash procedure

Organic load gCOD/m2·d Total COD Dissolved COD Rem % Rem % 8.1 90 92 5.3 91 93 3.1 94 97 Lix 1% 90 94 Lix 3% 60 58

SLIDE 7

ta l COD pro file s

20 40 60 80 100 200 400 600 800 1000 Reactor height (cm) COD (mg/L) x OLR: 8.1

OLR: 5.3 OLR: 3.1 Without leachate addition

20 40 60 80 100 200 400 600 800 1000 Reactor height (cm) COD (mg/L)

Lix 1% Lix 2% Lix 3%

With leachate addition

SLIDE 8

20 40 60 80 100 120 30 60 90 120 150 180 210

NH4‐N and NO3‐N (mg/L) Time (d)

NH4‐N Inf NH4‐N Efl NO3‐N Efl

OLR: 8.1 OLR: 5.3 OLR: 3.0

Change of backwash procedure Start‐up Lix: 1% Lix: 3%

Ammo nia nitro g e n

Organic load g/m2·d NH4-N NO3-N Rem % Efl mg/L 8.1 93 82 5.3 100 43 3.1 100 25 Lix 1% 100 37 Lix 3% 39 18

SLIDE 9

Ammo nia a nd nitra te nitro g e n pro file s

20 40 60 80 100 20 40 60 80 100 Reactor height (cm) NH4‐N (mg/L) x

OLR: 8.1 OLR: 5.3 OLR: 3.1

20 40 60 80 100 20 40 60 80 100 Reactor height (cm) NO3‐N (mg/L) x OLR: 8.1

OLR: 5.3 OLR: 3.1

20 40 60 80 100 20 40 60 80 100 Reactor height (cm) NH4‐N (mg/L)

Lix 1% Lix 2% Lix 3%

20 40 60 80 100 20 40 60 80 100 Reactor height (cm)

N‐NO3

‐ (mg/L)

Lix 1% Lix 2% Lix 3%

Witho ut le a c ha te With le a c ha te

SLIDE 10

Re spiro me try

30 60 90 120 150 180 210 1 2 3 4 5 6 7 8

Time (minutes) Dissolved oxygen (mg/L)

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

Dissolved oxygen (mg/l) Time (min)

30‐45 min 60‐75 min 90‐105 min 120‐135 min 150‐165 min 180‐195 min 201‐225 min

Air supply wa s suspe nde d e ve ry 15 minute s F ina l pro c e ssing o f slo pe s OL R = 8.1 g / m2·d witho ut le a c ha te

SLIDE 11

Oxyg e n upta ke ra te s

0.1 0.2 0.3 0.4 0.5 0.6 200 400 600 800 1000 Oxygen uptake rate (mg O2/L∙min ) COD (mg/L)

Total Exogenous substrate Endogenous substrate

0.00 0.05 0.10 0.15 0.20 0.25 0% 1% 2% 3% Oxygen uptake rate (mg O2/L∙min ) Leachate in wastewater (%)

Total Endogenous substrate Exogenous substrate

Witho ut le a c ha te With le a c ha te

SLIDE 12

CONCL USIONS

 Witho ut le a c ha te , 80 % o f COD re mo va l ta ke s pla c e within the first 20 c m o f

the filte r.

 Witho ut le a c ha te , COD re mo va l wa s 94 % a nd full nitrific a tio n wa s a c hie ve d

unde r the lo we st o rg a nic lo a d.

 With 1 % le a c ha te COD re mo va l wa s 90 % a nd NH

4-N re mo va l wa s 100 %

 With 3 % le a c ha te COD re mo va l wa s 60 % a nd NH

4-N re mo va l wa s 39 %

 Witho ut le a c ha te , o xyg e n upta ke ra te s inc re a se with inc re a sing sub stra te

(COD) c o nc e ntra tio n.

 With le a c ha te , o xyg e n upta ke ra te s de c re a se with inc re a sing le a c ha te

c o nc e ntra tio n.

SLIDE 13

T ha nk yo u

T his re se a rc h wa s po ssib le tha nks to the suppo rt pro vide d b y the Ge ne ra l Dire c to ra te fo r Ac a de mic Affa irs (DGAPA) o f the Na tio na l Unive rsity o f Me xic o , pro je c t I N110115, a nd to the sc ho la rship pro vide d b y the Me xic a n Na tio na l Co unc il fo r Sc ie nc e a nd T e c hno lo g y (CONACyT ).