Combined use of inorganic coagulants and cationic polyacrylamide for enhancing dewaterability of sewage sludge

Wang, Hou‐Feng; Hu, Hao; Wang, Huajie; Zeng, Raymond J.

doi:10.1016/j.jclepro.2018.11.208

Cited by 83 publications

(17 citation statements)

References 48 publications

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“…This results indicated that the oxidation of activated PPS induced charge neutralization. This might due to that the oxidation process disrupted flocs and reduced the amount of negatively charged organic matter, such as protein in EPSs, besides, the positive ion would reduce the electro-static repulsion of flocs, leading to charge neutralization (Wang et al 2018a;Liang et al 2020). Specially, when dosing 1.0 mmol/gDS PPS and 0.5 mmol/ gDS Fe(II), zeta potential changed from negative to positive, reached 0.53 mv.…”

Section: The Migration Of Organic Substancesmentioning

confidence: 99%

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Guo

Long

Huang

et al. 2021

Water Science and Technology

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The effects of thermally and Fe(II) activated potassium persulfate (PPS) on sludge dewatering performance were compared systematacially. Sludge dewaterability was monitored by measuring capillary suction time (CST) and sludge specific resistance to filtration (SRF), and the degradation effect was characterized by Chemical oxygen demand (COD), total organic carbon (TOC), ammonia nitrogen (NH4+-N) and extracellular polymeric substances (EPS). The Change of extracellular polymer substance (EPS) including soluble, loosely bound and tightly bound EPS (S-EPS, LB-EPS and TB-EPS) with time and PPS dosage was monitored to discuss the oxidation efficiency of thermally and Fe(II) activated PPS. Sludge supernate were analyzed by three dimensional fluorescence excitation-emission spectrum (3D-EEM) to confirm the proteins transformation. The result showed that sludge dewaterability in terms of CST and SRF were enhanced with increasing PPS dosage and condition time of both two activated methods. While Fe(II) activated PPS could reduce sludge CST and SRF to preferred values at low PPS dosage and short condition time. Maenwhile, sludge degradation effect was also more obvious. Mechanically, sludge TB-EPS in proteins and polysaccharides converted to SB-EPS was more quickly with Fe(II) activated PPS. Besides, thermally activated PPS tended to oxidize the protein in the supernatant first.

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Section: The Migration Of Organic Substancesmentioning

confidence: 99%

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Guo

Long

Huang

et al. 2021

Water Science and Technology

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“…[9][10][11] According to the principle, the existing sewage treatment methods can be divided into the physical method, chemical method and biodegradation method. [12][13][14] Among them, the physical method is mainly for suspended solids in sewage, the chemical method is mainly for colloidal particles and soluble substances in sewage, and the biodegradation method mainly relies on the degradation of microorganisms to purify sewage. 15,16 The coagulation method combined with physical and chemical treatment methods is generally recognized as the best method with the best economic effect and treatment effect, and an efficient flocculant is the core element of the coagulation method.…”

Section: Introductionmentioning

confidence: 99%

Preparation and performance evaluation of hybrid polymer flocculants (PAC‐PAM), and comparison experiments with other flocculants

Yao

Zhao

Guo

et al. 2022

Env Prog and Sustain Energy

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Using the initiator system of potassium persulfate, a new PAC‐PAM organic–inorganic hybrid flocculant was synthesized. This flocculant is used in sewage disposal. When the dosage was 10 mg/L and initial turbidity was 160 NTU, the turbidity removal rate of the heterogeneous flocculant reached the highest point of 95.04%, the water treatment effect of the hybrid flocculant is higher than that of other flocculants. The optimal experimental conditions in this experiment were as follows: the ratio of AM monomer to PAC was 8:2, the mass fraction of the added initiator was 0.2 wt%, the reaction temperature was 50°C, the reaction time was 4 h, and the pH of the effluent was neutral or weakly basic. Under the same dosage and different initial turbidity, the turbidity removal effect of hybrid flocculant is better than compound flocculant and PAM or PAC. The results show that the hybrid flocculant is a new material, which is different from the compound flocculant. Moreover, the hybrid flocculant is almost non‐corrosive to the equipment and has the prospect of industrial application.

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“…Similarly, the HL–polyacrylamide (polyAM) showed promising results for flocculating azo dye particles from model wastewater . Although the attachment of polyAM to natural polymers (i.e., lignin) can improve the grafting and bridging efficiencies of lignin in the flocculation process, it may have some disadvantages, such as a long dissolution time and a low efficiency for charge neutralization. , It was reported that the lignin-based flocculant prepared through grafting two monomers to lignin can significantly increase the solubility, molecular weight, and flocculation efficiency of lignin compared with that prepared through grafting one monomer to the lignin backbone . For instance, the charge density, molecular weight, and solubility of KL was increased significantly via copolymerizing lignin with AM and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (DMC), which showed a high flocculation efficiency for both kaolin and bentonite suspensions .…”

Section: Introductionmentioning

confidence: 99%

Production and Application of Triblock Hydrolysis Lignin-Based Anionic Copolymers in Aqueous Systems

2021

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Although lignin is currently an under-utilized biopolymer, it has the potential to be valorized through different modification pathways to yield alternative products to petroleum-based ones. In this work, hydrolysis lignin (HL) was copolymerized with acrylamide (AM) and acrylic acid (AA) under acidic conditions to generate the lignin/AM polymer (HM), lignin/AA polymer (HA), and lignin/AM/AA copolymer (HAM) with different negative charge densities and molecular weights. Lignin-based polymers characterized by advanced tools, such as proton nuclear magnetic resonance (1H NMR), gel permission chromatography (GPC), and elemental analysis confirmed the successful polymerization of HL with AM, AA, or AM/AA monomers. The adsorption analysis using a quartz crystal microbalance (QCM) revealed that compared to diblock HM and HA, the triblock copolymers of HAM adsorbed more on the Al2O3 surface and generated a bulkier adsorbed layer, which is important for lignin-based coating formulation. HAM1 with a lower charge density yielded a higher surface excess density, while HAM2 with a larger R h occupied more space (153.7 Å2) at the interface of water and Al2O3. In suspension systems, because of the higher M w, R h, and adsorption affinity, the bridging performance of HAM2 was more remarkable than that of the other lignin derivatives for Al2O3 particles via forming stronger flocs (with a deflocculation parameter, T df, of 80.6 s). However, the diblock lignin–AA (HA1) polymer showed the fastest floc regrowth capability after reducing the shear forces (with a reflocculation parameter, T rf, of 62.5 s). The high thermal stability, T g, and rheological characteristics of the HAM copolymer proved that it can be an excellent material for coating formulations and flocculants for wastewater treatment systems.

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Combined use of inorganic coagulants and cationic polyacrylamide for enhancing dewaterability of sewage sludge

Cited by 83 publications

References 48 publications

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Preparation and performance evaluation of hybrid polymer flocculants (PAC‐PAM), and comparison experiments with other flocculants

Production and Application of Triblock Hydrolysis Lignin-Based Anionic Copolymers in Aqueous Systems

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