Polyacrylamide and biopolymer effects on flocculation, aggregate stability, and water seepage in a silt loam

Publication date: March 2015
Source:Geoderma, Volumes 241–242
Author(s): Rodrick D. Lentz

Researchers seek a more renewable and natural alternative for water soluble anionic polyacrylamide (PAM), a highly-effective, petroleum-derived polymer used in agriculture to control erosion and reduce water seepage from unlined irrigation structures. This study evaluated four anionic polymers including low- (0.5Mgmol⁻¹) or high molecular-weight (MW) (10–20Mgmol⁻¹), bacteria-produced polysaccharides (biopolymers) and low- (0.2Mgmol⁻¹) or high-MW (12–15Mgmol⁻¹) PAMs. We evaluated their influence on (1) the rate and efficacy of colloid flocculation in 1- and 10-mgL⁻¹, high-MW, PAM or biopolymer solutions; (2) percent water stable aggregates in silt loam soil treated with water or 1000-mgL⁻¹ solutions of the four polymers; and (3) effective saturated hydraulic conductivity (seepage loss) when water or 500-mgL⁻¹, high-MW biopolymer or PAM solutions were applied to silt loam. The biopolymer most effectively flocculated the colloids at a concentration of 1mgL⁻¹, but was still 30% less effective than PAM at 1mgL⁻¹ and 50% less effective than PAM at 10mgL⁻¹. Overall, both polymer types increased the percent of stable soil aggregates in the silt loam, 1-to-2-mm-diam. size fraction, though PAM produced 1.35-times more stable aggregates than the biopolymer, 88.7% vs. 65.5%. These results suggested that the biopolymer's bulkier molecular conformation limited the extension and flexibility of the molecule in solution, compared to PAM. After 140h, the biopolymer reduced seepage loss rates by 21%, while PAM increased loss rates 1.6-fold, compared to controls. These data suggest that the biopolymer would be less effective than PAM for reducing water erosion owing to its lesser flocculation and aggregate-stabilizing potential. However, the biopolymer could be a more desirable alternative to PAM for controlling seepage from unlined irrigation canals and reservoirs; it (i) can be used effectively at lower concentrations, (ii) is considered more environmentally friendly, and (iii) is produced from a renewable resource.

Polyacrylamide and biopolymer effects on flocculation, aggregate stability, and water seepage in a silt loam

Trending Articles

Practice Sheet of Right form of verbs for HSC Students

Download: FK ft Shenky – Nakuyewa ”Prod by: Shenky”

How to win at Markstrat (Markstrat Tips and Tricks) – Vodites

Ominde Commission Report and Recommendations – Ominde Report of 1964

Bureau of Internal Revenue: Regional Offices (Directory)

GO 53 on Enhancement of Ex-gratia upto 5 Lakhs Toddy Tappers in Telangana

Cakewalk CA-2A Leveling Amplifier v2.0.1.97 WiN, v2.0.1.96 OSX Incl Keygen

Mp3 Download: Mdu - Kunjenjenjena

How the kill the job , when DTP request running for long hours.

Microsoft Intune から展開しているアプリのアップデートについて

18-year-old girl was beaten for half an hour by two Northampton men in 'an...

Car crash in Dunton Bassett leaves driver in critical condition

Macky 2, Two Others In Road Accident

Application log 00000000000000089514: Could not convert queue DLVST90CLNT

Detroit mafia: D’Anna Brothers agree to plea deal

Delivery block field greyed out using VA02

Muloraki Au

【個人撮影】スマホのプライベート映像♪「中に出さないで///」カラオケ屋での生ハメ撮りが流出ｗ【リベンジポルノ】＠PornHub

BREAKING NEWS: Diamond Platnumz Is Reported Dead After Ghastly Car Accident

FIAT 500 B0111 B0112