Preparation of sludge derived carbon with Fenton and NaClO activated and the application on the odor abatement

Transcription

1 Preparation of sludge derived carbon with Fenton and NaClO activated and the application on the odor abatement Lou Ziyang Dr. Associate Prof

2 Content Background SBC preparation Characterization of SBC The adsorption capacity of MB The odorous removal capacity of SBC Conclusions 2

3 1. Background -sludge Sludge=35 M ton Waste water=46.5 B m 3 Bailonggang WWTP: 200 Million Ton/d 3

4 Waste activited sludge (WAS) Organic contents Pathogens Heavy metals Stabilization and Resource Pyrolysis of sludge and activated carbon 4

5 Activation additives ell membrane Cytoplasm Sludge Activation Carbonization SBC Cell wall nucleus Porous Activated methods: Physical method water stream, CO 2 Chemical method ZnCl 2, H 2 PO 4, KOH Physico-Chemical methods..

6 Macro-MW Organic matter Volatile Organic matter Porous Sludge Activation process Carbonization Process I:Fenton II: NaClO Sludge activated SBC 4NaClO + 2H 2 O 4NaOH + 2Cl 2 + O 2. 6NaOH + C 2Na+2Na 2 CO 3 + 3H 2

7 ph TS (mg/l) Characteristics of waste sludge VS (mg/l) TCOD (mg/l) SCOD (mg/l) STN (mg/l) STP (mg/l) 6.64~ ~ ~ ~ ~ ~ ~38.9 Raw Sludge Sludge Activation Sludge Precursor Carbon Wash Fig. the preparation of SBC Carbonization

8 2. SBC preparation 2.1 NaClO control 43m 2 /g Variations of BET of carbon and the activations (m 2 /g)

9 Characterization of SBC Sample BET (m 2 /g) V total (cm 3 /g) V micro (cm 3 /g) V micro / V total (%) Control sample KOH KOH KOH KOH KOH KCl KCl KCl KCl KCl NaClO NaClO NaClO NaClO NaClO

10 Variations of C, H, O distribution ratio a) control, b) KCl, c) KOH, d) NaClO

11 2.2 Fenton H 2 O 2 5% 347mg/g Effect of H 2 O 2 dosage on the iodine value Effect of H 2 O 2 dosage on the rate of change of VS and TS

12 Activation process H 2 O 2 /Fe 2+ ph 5:1 Low ph: 3 Fe 2+ +HO-OH { Fe 2+ -O-OH+H + } Fe 3+ -OH+HO Fe O----OH Fe(Ⅳ)= O+H 2 O Reaction T H H+ Fe 3+ +H 2 O Solid content 2h 1.0% High ph Fe 2 Fe 3+ +OH - Fe(OH) 3 Effect of activation conditions on the iodine value

13 Carbonization process T t 600 2h Heating rate 10 /min Effect of carbonization conditions on the iodine value

14 Chemical properties of sludge-based carbon Control activation Yield(%) Ash content(w%) C(w%) N(w%) S(w%) H(w%) O(w%) Ash analysis(weight% in the ash) Fe Si Al Cu Ca Mg Zn Cr Na

15 Control Activation TGA 6Fe 2 O 3 +C 4Fe 3 O 4 +CO 2 TG-DTG curves of sewage sludge with and without activation Fe 3 O 4 +2C 3Fe 0 +2CO 2 0~120, water evaporation 0~120, water evaporation 200~450, Aliphatic Organic 250~400, low MW material compounds 400~520, Carbohydrate etc. 450~650, protein 600~800

16 2.3 Summary Surface Characteristics of porous structure of SBC BET (m 2 g -1 ) V total (cm 3 g -1 ) V micro (cm 3 g -1 ) V micro / V total (%) Control SBC-Fenton SBC-NaClO The element distribution in SBC SBC-Control SBC-NaClO SBC-Fenton Yield(%) Ash content(w%) C(w%) N(w%) S(w%) H(w%) O(w%) Fe(w% in the ash)

17 a b c d SEM image of SBC, a) SBC-control and b) SBC-NaClO; c) SBC-control and d) SBC-Fenton

18 (a) Dried sludge and SBC-control, (b)sbc-naclo (c)sbc-fenton FTIR spectra scan of SBC with and without activation

19 2.4 Adsorption process-naclo The removal efficiency of SBC by MB Saturated extend of adsorption MB: mg/g The removal of MB by SBC

20 Optimum process-sbc-fenton Adsorption equilibrium of MB(A) and MO(B) of different SBC-Fenton ([ 亚甲基蓝 ]=[ 甲基橙 ]=100mg/L;[ 活性炭 ]=1g/L; 温度 =25 ;ph=7) Saturated extend of adsorption MB: C-44.9mg/g, A-67.3mg/g Saturated extend of adsorption MO: C-20.1mg/g, A-46.1mg/g

21 Adsorption capacity Initial ph T Effect of different adsorption conditions of MB

22 Parameters of adsorption models of dye on SBC-Fenton Isotherms Parameters Methyl blue Methyl orange q m (mg/g) Langmuir K l (L/mg) R Freundlich Kf(mg/g) /n Effective absorption Fit for Langmuir equation R The change of R L as a function of C 0 on the dye adsorption by carbon

23 2.5 Adsorption process-naclo For NH 3 removal- SBC NaClO Sample b (K/min) T p (K) E d (KJ/mol) A (10 13 min -1 ) NaClO KCl Kinetic parameters of activated carbon adsorption of ammonia The isothermal equation of NH 3 adsorbent using SBC-NaClO

24 For H 2 S removal influence dosage of SBC- Fenton on H 2 S removal rate (H 2 S:N 2 (v/v)=5:5, T=25, vibration rate=100rmp) 5ds, 10g SBC-Fenton, removal rate of 44.2%

25 Injection volume of H 2 S The influence of H 2 S concentration on H 2 S removal rate (AR:SBC=7:3, T=25,vibration rate=100rmp) H 2 S:N 2 =2:8 and 1:9, total H 2 S removal rate reach to 100%

26 4. Conclusions Higher quality SBC was prepared with the activators of Fenton and NaClO. Both of them contributed to the increase of BET and V micro / V total, which were 6.7 and 11 times higher than SBC-control Activation process was necessary to applied to improve the SBC quality by destroying of cell wall barrier and decompose of the complex macro compounds. The intermediate products of Fe and NaOH contributed to SBC-activated structure The saturation adsorption capacity could be around 71.5, 67.8 and 33.1 mg g -1 in SBC-Fenton, SBC-NaClO and SBC-control using MB

27 Thank You!

28 Postdoctoral/Ph.D Position Shanghai JiaoTong Univ., China Lou Ziyang: Research field Solid waste treatment and resource GHG accounting (LCA) and reduction methods Advanced treatment of industry waste and leachate Upconversion photocatalysts synthesis and its application