Biosolids dewatering using super absorbent polymers (SAPs) Mostafa M.Noureldin Illinois Institute of Technology
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1 Biosolids dewatering using super absorbent polymers (SAPs) Mostafa M.Noureldin Illinois Institute of Technology
2 Overview Super absorbent polymers (SAP) Biosolids management concerns Approach Results SAP removes water from biosolids SAP is recycled Conclusions Future work
3 Super absorbent polymers SAP Hydrogels Retain large water volume Add little mass Many applications Agriculture Diapers Wire water blocking
4 Biosolids management There s s too much water Hinders process efficiency Removal is energy intensive Biosolids management is expensive Hypothesis: An SAP-based dewatering process can be cost effective
5 Lab work Concept Water recovery Biosolids SAP SAP Reuse
6 Experimental work 1. Milorganite: Biosolids by-product 5% N 4% Fe 2% P 2 O 5 1.2% Ca 2.Tea filter 3. SAP
7 Preparing surrogate biosolids Milorganite reconstitution Volume = 500 ml Temperature range = C Electric blender Solid content % g
8 Water absorption is rapid 100 Original % solids 5% Pure Water Water captured, g % 15% 20% SAP dose is 0.5 gram Time, min
9 Water uptake increases with SAP dose 12 SAP dose, g Solid content, % Double Time, min
10 Milorganite versus real biosolids? Overnight mixing improves hydration Yields more realistic slurry
11 Solids preparation affects water removal 12 SAP dose = 2.5 g Solid content, % Alternate preparation method Time, min
12 Surrogate vs. Real biosolids sample 8 7 Milorganite Digested sample Solid content, % Time, min
13 SAP regeneration Regeneration through: 1. ph control 2. Temperature control 3. Electrolysis Test is conducted on Pure Water
14 Regeneration rate decreases over time 80 Pure Water 70 % Water recovery Applied potential (v) Time, min
15 Regeneration rate increases with potential 80 Pure Water 70 % Water recovery Applied potential (v) Time, min
16 Regeneration rate increases with potential 80 Pure Water 70 % Water recovery Applied potential (v) Time, min
17 Regeneration rate increases with potential 80 Pure Water 70 % Water recovery Applied potential (v) Time, min
18 Performance decreases with increasing cycles 0 Time, min to collect 50 ml of water Biosolids could improve cycling performance Pure water leaches ions from SAP Cycles
19 Dewatering is rapid Conclusions Solids concentration is increased at least 50% SAP can be regenerated Biosolids characteristics affect performance
20 Suggested applications Pre-treatment Blending Storage Conditioning Thickening Gravity belt Rotary drum Digestion Aerobic Anaerobic Lime stabilization Dewatering Centrifuge Filter press Drying beds Biosolids Thanks Disposal Drying Direct drying Storage
21 Future work Continue with real biosolids test Bench scale design Membrane BIOSOLIDS SAP Thicker biosolids Continuous contacting design Water recovery SAP Reuse $avings
22 Future work Assess the possibility of reducing non- reusable polymers before dewatering Analysis of different parameters Membrane selection procedure Particle size distribution Surface charge
23 Questions?
24 Project Team Professor Paul Anderson (EnvE( EnvE) Professor Fouad Teymour (ChBE( ChBE) Enve MS student (Mostafa M. Noureldin)
25 Extra aiding data
26 SAP-based biosolids dewatering concept Efficient management Wet biosolids Dry biosolids Water recovery Dry SAP Wet SAP SAP recycle
27 Lab work Concept Water recovery SAP Reuse
28 Water distribution in biosolids: Intracellular water Colloidal water Free Water (75%) Depending Capillary water 95 % of biosolids is water
29 Water management in WWTP Wastewater influent Discharge Screens Grit Chamber Primary clarifier Aeration tank Secondary clarifier Conventional WWTP Return activated sludge Biosolids treatment and disposal Disinfection
30 Test
31 SAP types and preparation processes Wide variety depending on: 1.Chemistry 2.Cross linking Core Surface 3.Manufacture Starch, cellulose, polyvinyl, and polyethylene Polyacrylicacid Preneutralization Postneutralization
32 Expanding Beyond Simple Dewatering
33 Ionic Partitioning Some ionic species can be preferentially enriched in the absorbed hydrogel This can be controlled by proper design of the hydrogel functionality Possible by-products of value in aqueous recovery stream, e.g. Liquid fertilizer,
34 Directed Polymer Synthesis Controlled crosslink density leads to control over absorption/desorption rate and capacity. Design of functionality (Sulfonic( vs. carboxylic acids) can enhance the osmotic pressure of the hydrogel and thus the rate of absorption. Design of functionality (acid vs. base) can be used to target specific ion separation
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