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

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 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

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 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) Obje c tive T his wor k e valuate s the c ombine d tr e atme nt of old le ac hate fr om 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 Bor do ponie nte landfill

ME T HOD Pilo t filte r a nd filte r me dia 15 cm 90 cm Effluent L a va sto ne s with 9.0 mm a ve ra g e size . O 2 probe 100 cm Pilot filter characteristics Filter media characteristics Average particle Total height 1.90 m 9.0 mm size Air Backwashing Internal diameter 0.15 m Specific area 427 m 2 /m 3 water Influent Effective volume 9.02 L Apparent porosity 51 % T he pilo t filte r Filter bed depth 1.0 m Total surface area 7.7 m 2

E xpe rime nta l sta g e s a nd o pe ra tio n c o nditio ns • Continuous flow • Waste wate r flow: 66 L / d • Hydr aulic r e te ntion time (HRT ): 3.7 h • Air flow: 2 L / min OLR Leachate COD NH 4 -N PO 4 -P Stages g/m 2 ·d v/V mg/L mg/L mg/L 1 9.0 ---- 1050 90 45 2 5.0 ---- 580 60 30 3 3.0 --- 350 30 15 4 3.1 1% 361 37 17 5 3.2 3% 372 44 19

Synthe tic wa ste wa te r a nd le a c ha te 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 Ge ne r al c omposition of le ac hate Barium 0.23860 Cadmium ND COD T 1408 mg/L Chrome 0.16340 BOD 150 mg/L Mercury 0.000992 BOD/ COD T 0.1 Lead ND Kjeldahl nitrogen 818 mg/L Selenium ND NH 4 -N 731 mg/L Molybdenum 0.04780 PO 4 3- -P 163 mg/L Nickel 0.22290 pH 8.5 Manganese 0.2509 Iron 1.95600 Copper 0.05850

RE SUL T S COD re mo va l 1200 Influent OLR: 8.1 Efluent OLR: 5.3 1000 Total COD Soluble COD Start ‐ up Total Dissolved Organic COD (mg/L) 800 OLR: 3.0 COD COD load Rem Rem Lix: 3% Lix: 1% gCOD/m 2 ·d 600 % % Change of 8.1 90 92 backwash 400 procedure 5.3 91 93 3.1 94 97 200 Lix 1% 90 94 Lix 3% 60 58 0 0 30 60 90 120 150 180 210 Time (d)

T o ta l COD pro file s 100 100 x OLR: 8.1 Lix 1% Reactor height (cm) Reactor height (cm) OLR: 5.3 Lix 2% 80 80 OLR: 3.1 + Lix 3% 60 60 Without leachate addition With leachate addition 40 40 20 20 0 0 0 200 400 600 800 1000 0 200 400 600 800 1000 COD (mg/L) COD (mg/L)

Ammo nia nitro g e n 120 OLR: 8.1 NH 4 ‐ N Inf NH 4 ‐ N and NO 3 ‐ N (mg/L) NH 4 ‐ N Efl OLR: 5.3 100 NO 3 ‐ N Efl OLR: 3.0 Organic NH 4 -N NO 3 -N 80 Rem Efl Lix: 1% Lix: 3% load Start ‐ up % mg/L g/m 2 ·d Change of 60 backwash 8.1 93 82 procedure 5.3 100 43 40 3.1 100 25 Lix 1% 100 37 20 Lix 3% 39 18 0 0 30 60 90 120 150 180 210 Time (d)

Ammo nia a nd nitra te nitro g e n pro file s 100 100 x OLR: 8.1 x OLR: 8.1 OLR: 5.3 Reactor height (cm) OLR: 5.3 Reactor height (cm) 80 80 OLR: 3.1 OLR: 3.1 60 60 Witho ut 40 40 le a c ha te 20 20 0 0 0 20 40 60 80 100 0 20 40 60 80 100 NH 4 ‐ N (mg/L) NO 3 ‐ N (mg/L) 100 100 Lix 1% Lix 1% Reactor height (cm) Lix 2% Lix 2% Reactor height (cm) 80 80 + Lix 3% + Lix 3% 60 With 60 40 le a c ha te 40 20 20 0 0 0 20 40 60 80 100 0 20 40 60 80 100 ‐ (mg/L) NH 4 ‐ N (mg/L) N ‐ NO 3

8 Dissolved oxygen (mg/L) 7 Re spiro me try 6 5 4 3 2 Air supply wa s suspe nde d 1 e ve ry 15 minute s 0 0 30 60 90 120 150 180 210 Time (minutes) 6.5 30 ‐ 45 min 6.0 60 ‐ 75 min Dissolved oxygen (mg/l) 90 ‐ 105 min 5.5 120 ‐ 135 min 5.0 150 ‐ 165 min 180 ‐ 195 min 4.5 201 ‐ 225 min 4.0 3.5 F ina l pro c e ssing o f slo pe s 3.0 2.5 R = 8.1 g / m 2 ·d OL 2.0 witho ut le a c ha te 1.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Time (min)

0.6 Oxyg e n Total Exogenous substrate 0.5 Oxygen uptake rate Endogenous substrate upta ke (mg O 2 /L ∙ min ) 0.4 ra te s 0.3 0.2 Witho ut 0.1 le a c ha te 0 0 200 400 600 800 1000 COD (mg/L) 0.25 Total Endogenous substrate 0.20 Exogenous substrate Oxygen uptake rate (mg O 2 /L ∙ min ) 0.15 0.10 0.05 With le a c ha te 0.00 0% 1% 2% 3% Leachate in wastewater (%)

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.

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 ).