Water Treatment Sludge Research Articles

Electrolysis using Pt/SS electrodes for aluminum recovery from drinking water treatment sludge

Alum sludge from the drinking water treatment plant (DWTP) of Surabaya City, Indonesia, potentially contains high aluminum and organic pollutant contents. Aluminum is sourced from the use of aluminum sulfate as a coagulant during the water treatment process. Whereas, the organic pollutant is from domestic and industrial wastewater discharges into the raw water source. Aims of this study were to characterize the alum sludge of the Surabaya DWTP, to determine suitable electrode materials and optimum electrical current for aluminum recovery using electrolysis. The sludge was characterized according to metal concentrations and chemical oxygen demand (COD). Cyclic voltammetry, a common method for determining appropriate electrode materials for electrolysis, was conducted to confirm platinum (Pt) and stainless steel A304 (SS A304) as suitable electrodes. A polarization test was applied to determine the current for electrolysis. Electrolysis using these electrodes was conducted in one compartment reactor for 6 h. The results showed that the sludge had high concentrations of aluminum and organic substance. The suitable anode and cathode in the electrolysis of acidified alum sludge at pH 3 were Pt and SS A304, respectively. Aluminum recovery efficiency was achieved at 300 mA (52.10%), in which metal impurities were low, and COD removal was 24%.

ESTUDO DA ADIÇÃO DO LODO DE ETA - ESTAÇÃO DE TRATAMENTO DE ÁGUA EM ARGAMASSAS DE REVESTIMENTO

No processo de tratamento de água, mais precisamente na lavagem dos filtros e descarga dos decantadores, é produzido um resíduo conhecido como lodo. Este ainda é bastante negligenciado e tem sua disposição final inadequada, sendo depositado em corpos hídricos ou em terrenos baldios. Nesta pesquisa, foram realizados testes com o resíduo coletado numa concessionária de abastecimento de água da região sul, caracterizando-os quanto as suas propriedades físico-químicas, e posteriormente, produzindo argamassas com 0%, 3%, 5% e 10% de adição do lodo da ETA em relação à massa do agregado. Os resultados indicaram que as propriedades mecânicas das argamassas sofrem uma diminuição com a adição do lodo de ETA, em relação à argamassa de referência, com a sua incorporação as argamassas apresentaram menores valores de módulo de elasticidade, o que indica que estas argamassas possuem uma boa capacidade de sofrer deformações, e a adição do lodo de ETA possibilitou a diminuição da absorção de água por capilaridade das argamassas, deixando-as mais resistentes contra agentes deletérios que ocasionam patologias nas mesmas.

Ecotoxicological and chemical properties of the rożnów reservoir bottom sediment amended with various waste materials

In the study, an attempt was made to create innovative mixtures based on bottom sediment and various types of waste to be tested for use as a substrate in the cultivation of consumer and non-consumer plants. The aim of the study was to assess the chemical and ecotoxicological properties of the growing medium prepared on the basis of bottom sediment (BS) and different carbon rich waste (cellulose waste (CW), biomass ash (BA), coffee hulls (CH), and sludge from water treatment (SW)) with a combination of 75% bottom sediment and 25% waste material. The mixtures had deacidifying properties, significant content of total organic carbon (TOC), the total quantities of macro- and micronutrients, and good sorption properties. The study showed a low total content of heavy metals in the mixtures. Moreover, a low share of the mobile fraction (F1) of metals indicated a low risk related to the metals mobility and potential bioavailability. The highest toxic effect was found in the mixture of bottom sediment and cellulose waste. Heterocypris incongruens was the most sensitive organism to substances present in the tested mixtures. Due to its low toxicity, the mixture of bottom sediment and water treatment sludge (BS+SW) constituted a potentially suitable substrate for its environmental application in agriculture, horticulture (for consumer crops) or land reclamation. Other mixtures exhibited valuable chemical properties (BS + BA, BS + CH BS + CW), but ended up being eco-toxic to the organisms, excluding them from agricultural or horticultural use for consumer crops. The proposed technology, which includes the production of growing medium based on the use of bottom sediment, is a promising way of transforming the sediment from a waste material to a valuable resource, thus enhancing the environmental benefits.

Strength and Noise Reduction of Geopolymeric Material Produced from Waste Sludge

This research investigated the use of water treatment sludge (WTS) as an geopolymerized material. WTS with an initial SiO2:Al2O3 ratio of 3.25 was thermally treated at temperatures of 105, 500, 650 and 850 °C for 1 h. The powdered WTS after calcinations was reacted with alkaline-silicate solution (ASS) with different proportion between NaOH and Na2SiO3 solutions. The effect of calcining temperatures on the strength’s development of WTS geopolymer was determined. Without thermal treatment of the WTS, no strength was gained during the early stages. Samples prepared from WTR calcined at 850 °C exhibited the highest strength at all curing times. When WTS geopolymer was prepared as solid plate, the test in noise reduction was explored at various sound frequencies between 1000-10000 Hz. The average noise reduction efficiency of WTS geopolymer was 63.5% closed to the case of commercial light-weight brick at the same paste’s thickness.

Low-cost ceramic membrane made from alumina- and silica-rich water treatment sludge and its application to wastewater filtration

Drinking water treatment sludge (DWTS) was used for the preparation of ceramic microfiltration membrane. The DWTS powder was firstly characterized to determine its chemical and mineralogical composition, and to understand its thermal behavior. DWTS powder was mixed with clay as binder and starch as porosity agent, then pressed to shape flat membrane, and sintered at different temperatures from 950 to 1150 °C. The optimal sintering temperature (1050 °C) provides ceramic membrane with a porosity of 46.7%, a pore size of 0.92 μm, a mechanical strength of 14.5 MPa and a permeability of 724.5 L/h.m2.bar. This membrane was successfully used to clarify a synthetic baking powder suspension and an textile effluent. DWTS-based membrane was able to remove completely the turbidity from feeds, to reduce significantly the chemical oxygen demand (COD), and to discolor completely textile wastewater. Furthermore, four empirical models were applied to describe the fouling mechanism occurred during filtration experiments.

Recycling of iron and aluminum from drinking water treatment sludge for synthesis of a magnetic composite material (ALCS-Fe-Al) to remove fluoride from drinking water

In this study, a novel investigation for recovery of Al and Fe from drinking water treatment sludge (DWTS) has been conducted, which are used for the synthesis of a magnetic composite material (ALCS-Fe-Al) by loading Al/Fe oxides onto acid-leached carbonized sludge (ALCS). The low-cost magnetic adsorbent which can be easily separated from water by a magnet was tested for the ability to remove fluoride from drinking water. The most effective adsorbent ALCS-Fe-Al was prepared under the following conditions: ALCS:Fe = 1:1 & (ALCS-Fe):Al = 1:2. While the preparation conditions of the adsorbent ALCS-Fe-Al* prepared according to the actual iron and aluminum contents in the sludge are: ALCS:Fe = 1:1 & ALCS-Fe:Al = 2:1. Both of the two adsorbents could reduce the fluoride concentration to below 1.5 mg/L in aqueous solution at pH = 7, T = 25 °C with a adsorbent ratio of 3g/L, which meets the level of drinking water standard recommended by the World Health Organization (WHO). In addition, it had a relatively high selectivity for fluoride versus common competitive co-existing ions and high fluoride removal efficiency in a wide range of initial pH of 4-9. At neutral initial pH, the adsorption isotherm was well fitted with the Langmuir model. The maximum adsorption capacity reached 30.49 mg/g. The adsorption kinetics followed the pseudo-second-order model. Furthermore, the adsorption performance, composition and adsorption mechanism of the adsorbent can be proved by SEM, BET, VSM, XRD and XPS. This work provides a new idea for full utilization of DWTS as adsorbent for fluoride removal from drinking water.

Recycling drinking water treatment sludge into eco-concrete blocks with CO2 curing: Durability and leachability

Drinking water treatment sludge (DWTS) can be recycled into low-strength concrete blocks for construction use. The sodium sulfate resistance and leaching behaviours of the DWTS-derived blocks are investigated in this study. The experimental results show that the addition of DWTS degrades the sodium sulfate resistance of the concrete blocks, however CO2 curing compensates for such property, especially in the case of blocks incorporating 30% DWTS. The improvement can be attributed to the formation of crystalline CaCO3 during CO2 curing for microstructure refinement evidenced by X-ray Computed Tomography and Scanning Electron Microscopy. Leaching analyses show that Cu and Al concentrations increased with increasing DWTS content, and CO2 curing adversely increased the leachability of metals due to the decrease of pH, especially at early leaching stage. Nevertheless, the total leaching concentrations of Cu and Al after 60-day test is far below the prescribed limitations, regardless of samples subject to air curing or CO2 curing. In summary, sludge-derived blocks exposed to CO2 curing are safe and behave well in aggressive environments. Therefore, this study showcases a green technology that successfully recycling DWTS into value-added and durable concrete blocks with low environmental impacts.

Cement stone, modified by chemical water treatment sludge

Chemical treatment of municipal and industrial wastewater is becoming increasingly common in the world, resulting in sludge formation. But only a small fraction of the waste is disposed of. Therefore, the issue of the potential use of these wastes in making construction materials is vital.This paper examines the possible use of multi-tonnage industrial waste, in particular, sludge of chemical water treatment (SHVO) produced by combined heat and power plants in cement systems. Sludge of chemical water treatment is a pasty mass unstable in moisture. For this purpose it is advisable to pre-dry this waste until it becomes a fixed-mass, and then grind it. The impact of SHVO on the technological properties of cement paste and strength properties of cement stone was studied. The article shows that the introduction of SHVO into cement paste increases its water demand. The joint effect of naphthalene formaldehyde and polyester carboxylate-based sludge with additives was studied. Their efficiency depends on the way they are produced. The use of sludge with superplasticizers reduces binding agent consumption by 7.5% without loss of strength properties and reduces porosity of cement stone.It was established that the introduction of SHVO into cement systems changes the physiography of newgrowths.

Activation of percarbonate by water treatment sludge–derived biochar for the remediation of PAH-contaminated sediments

Sludge from a groundwater treatment plant was used to prepare biochar by pyrolysis. The Fe–Mn rich biochar was used to activate percarbonate for the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated aquatic sediments. Results showed that the sludge–derived biochar (SBC) produced at a pyrolysis temperature of 700 °C was the most effective in activating percarbonate, which exhibited significant oxidative removal of PAHs. PAHs degradation took place via a Fenton-like oxidation manners, contributed from the Fe3+/Fe2+ and Mn3+/Mn2+ redox pairs, and achieved the highest degradation efficiency of 87% at pH0 6.0. Reactions between oxygenated functional groups of biochar and H2O2 generated of O2•– and HO• radicals in abundance under neutral and alkaline pH was responsible for the catalytic degradation of PAHs. Our results provided new insights into the environmental applications of SBC for the green sustainable remediation of organics-contaminated sediments and aided in reduction of associated environmental and health risk.

Characterization of dissolved organic matter extracted from water treatment sludge

Abstract The characteristics of dissolved organic matter (DOM) that formed during the aerobic and anaerobic incubation of drinking water treatment sludge stored at different temperatures (5 °C, 20 °C, 40 °C) for long periods (7, 14, and 21 days) were investigated. Anaerobic incubation at high temperatures with prolonged storage was found to result in higher organic content than aerobic incubation (3.6–6.8 times at 40 °C). The high temperatures caused changes in the DOM fractions, with humic-like substances mainly formed in aerobic incubation and protein-like substances in anaerobic incubation. Results showed that the fluorescence intensity of humic-like and protein-like substances increased by 45% and 22%, respectively, at the end of the anaerobic incubation period. The UV-absorbing DOM constituents in aerobic incubation had lower molecular weights and were more heterogeneous than those in anaerobic incubation.

IMMOBILIZATION OF SOME HEAVY METALS IN GEOPOLYMER BASED ON WATER TREATMENT SLUDGE AND ALUM INDUSTRY SOLID WASTE

This paper investigates the immobilization behaviors of Cd2+, Pb2+ and Hg2+ ions in a geopolymer based on water treatment sludge (WTS) and dealuminated metakaolin (DaMK) solid waste from alum industry. For synthesis of WTS/DaMK based geopolymer, five mixes of WTS/DaMK (75/25, 80/20, 85/15, 90/10 and 95/5, respectively) are tested to obtain the optimum synthesis condition based on the compressive strength. Results showed that the geopolymer mortar with 85/15WTS/DaMK has the highest compressive strength (8 MPa). In addition, X-ray Diffraction (XRD) and X-ray Fluorescence (XRF) techniques are used to characterize the mineral and chemical compositions of WTS and DaMK. WTS/DaMK based geopolymer mortar have been tested for leaching to study its immobilization behavior under the optimum condition. The Cd2+, Pb2+ and Hg2+ ions were used and effectively immobilized in this study. The heavy metals with concentrations of 100, 200 and 300 ppm were used in the geopolymer matrix giving about 98% of immobilization efficiency. The study showed that Pb2+ has the best immobilization efficiency followed by Hg2+ and Cd2+ with high concentrations.

Recycling of raw water treatment sludge in cementitious composites: effects on heat evolution, compressive strength and microstructure

Water treatment sludge (WTS) is produced daily and represents a globally significant solid waste stream. The application of this sludge as construction materials has been studied although most studies have modified the sludge before its incorporation, hence involving significant energy consumption. This study aims to use raw sludge as a novel cementitious material, by determining the effects of sludge addition on the composition and performance of cementitious composites. Important aspects such as the physicochemical interaction of the raw sludge with the Portland cement, the heat evolution of the cement paste and the compressive strength of the composite cement were carefully studied. The results show that for 1-2% of WTS addition, the compressive strength and heat evolution of the cement paste was well maintained being close to the reference specimen after 28 days of curing. However, for sludge addition above 5%, a delay in the hydration reaction was observed, together with about 25% reduction in compressive strength at 28 days of curing. The mineralogical and thermal analysis showed decreasing portlandite content and increasing calcite in the WTS-amended composites. Scanning electron microscope analysis demonstrated that the addition of sludge induced more porous and weak surface structures compared to the reference specimen.

Effect of activated water treatment plant solid waste sludge on waste water for irrigation

This study aims to reusing of normal sludge from water treatment plants for waste water treatment for agricultural use. Normal and acid activated sludge with different acid concentration is used for the treatments. 1, 2,4 N HCl is the activator. 1- 20 g/lt from sludge are used. The best effect of water treatment plant sludge(WTPS) in waste water treatment, due to using of acid activated sludge ( 1N HCL, 2N HCl ) in waste water treatment was 3g/lt at room temperature.It was observed that,activation of sludge affected on their particles properties; size, structure and density that leads to increase of; surface area and adsorption efficiency, pH decreased from 9.6 to 8.3 then raised to 9,BOD as well as COD decreased from78/129 to 30/10 with addition of raw or acidified sludge till 2N HCl while the effect of 4N HCl is 500/100, Ammonia decreased by 14-33% with addition of sludgeand 20%, Heavy metals; Al+3 and Fe+3, reduction is observed in this study. These uptakes of them is up to 75% to 95 % turbidity (1 NTU) where it was improved till 99%; Phosphate uptake is 19-60% with addition of raw sludge and acidified with 1N and 2N, HCl; while at 4N, HCl the uptake is 19%, conductivity and TDS increased together with 8% approximately but it was observed, conductivity and TDS decreased. The influence of mixed salt solutions percolation on the media that elevated exchangeable sodium levels at low concentrations cause dispersion and swelling of the clay minerals and consequently a reduction in hydraulic conductivity of the water solution.wateranalysed with reference COD, BOD, Turbidity, conductivity, TDS, pH, Ammonia, Phosphate and aluminum, Iron according to international standards. The result indicates to the best using of normal sludge was 5g/lt, at room temperature and acid activated sludge ( 1N HCL, 2N HCl ) in waste water treatment was 3g/ltat room temperature. We can recommended that the reuse of raw water clarification sludge was the best compensation to get suitable COD, BOD, Turbidity, conductivity, TDS, pH, Ammonia, Phosphate and heavy metals removal in waste water and preserving the environment.

Assessing the removal of organic micropollutants from wastewater by discharging drinking water sludge to sewers

Discharging drinking water treatment sludge (DWTS) to sewers could be an efficient waste management strategy with the potential to replace chemical dosing for pollutant control. This study for the first time investigated the fate of 28 different organic micropollutants (MPs) due to the dosing of iron-rich and aluminum-rich DWTS in a pilot rising main sewer. Nine MPs had an initial rapid removal within 1-hr (i.e., 10–80%) due to Fe-DWTS dosing. The formation of FeS particles due to Fe-DWTS dosing was responsible for the removal of dissolved sulfides (80% reduction comparing to control sewer). Further particle characterization using SEM-EDS, XRD and ATR-FTIR confirmed that FeS particles formation played an important role in the removal of MPs from wastewater. Adsorption of MPs onto the FeS particles was likely the possible mechanism for their rapid removal. In comparison to iron-rich DWTS, aluminum-rich DWTS had very limited beneficial effects in removing MPs from wastewater. The degradability of degradable MPs, including caffeine, paraxanthine, paracetamol, metformin, cyclamate, cephalexin, and MIAA were not affected by the DWTS dosing. Some non-degradable MPs, including cotinine, hydroxycotinine, tramadol, gabapentin, desvenlafaxine, hydrochlorothiazide, carbamazepine, fluconazole, sulfamethoxazole, acesulfame, saccharin and sucralose were also not impacted by the DWTS dosing. This study systematically assessed the additional benefits of discharging Fe-DWTS to the sewer network i.e., the removal of MPs from the liquid phase thereby reducing its load to the treatment plant. The results corroborate the discharge of Fe-rich DWTS in sewers as an effective and beneficial way of managing the waste by-product.

Aluminum and Organic Contaminant Removal from Drinking Water Treatment Sludge

Coagulation process using aluminum sulfate (Al2SO4) or alum as coagulant at a drinking water treatment plant generates a large volume of alum sludge. The alum sludge contains high concentrations of aluminum and organic matter, which are harmful to the environment. Organic contaminants can decrease the conductivity and mobility of ions in electrolyte, so it can reduce the effectiveness of electrolysis to remove the aluminum. Aims of this study are: (1) to determine the aluminum and COD removal in electrolysis process using carbon-silver electrodes and (2) to measure the efficiency of COD removal by H2O2 oxidation and UV light exposure. The sludge was acidified to pH 3 and 4 and centrifuged prior to electrolysis. The electrical current was 300 mA, based on polarization test using carbon silver as anode and cathode electrodes. Electrolysis was carried out in a batch recirculation one-compartment reactor for 10 hours. Deposited matter of alum at cathode was weighed and analyzed by Inductively Coupled Plasma. The electrolysis pretreatment was meant to remove high organic contaminants in electrolyte. The pretreatment was carried out by oxidation with addition of H2O2 with a ratio of [H2O2]/[COD] = 1/2 and 254 nm UV light exposure for 4 hours. This study resulted in low aluminium deposit of 3.19 mg at the cathode with COD removal of 11.11% at initial pH 3 using electrolysis. The highest COD removal efficiency by oxidation with addition of H2O2 and UV light exposure was 75%. It can be concluded that H2O2 oxidation and UV light exposure could be applied prior to electrolysis for optimizing aluminum removal.

Aluminum leaching from water treatment sludge using hydrochloric acid and kinetic study.

Water treatment sludge (WTS) is abundantly produced in the world; the waste contributes to the environmental problems. Therefore, for WTS utilization, aluminum leaching was employed using hydrochloric acid in this study. Al leaching efficiency increased from 72% to 80% as hydrochloric acid concentration increased from 1 to 4M. Decreasing the particle size and increasing the temperature increased Al leaching efficiency. The proposed kinetic model revealed that the rate-controlling step followed a series of two leaching mechanisms: initially controlled by product-layer diffusion and then by a chemically controlled reaction. For instance, at 70°C, the initial stage is well fitted by product-layer diffusion (R2 = 0.87) compared to R2 = 0.60 for chemical reaction; while for the second stage, R2 = 0.95 was observed via chemical reaction compared to R2 = 0.74 for product-layer diffusion. The activation energies in these two stages were 9.58kJ/mol and 10.73kJ/mol, respectively. The proposed model was well validated by using data from literature and thus will be useful for other applications of leaching and extraction processes.

Sludge and scum blends from water and sewage treatment plants for energy recovering toward a circular economy perspective

Here, we investigate how to improve the energetic potential of different sludge and scum from water and sewage treatment plants through co-combustion of their blends. We collected samples in Curitiba, Brazil, from: (a) anaerobic sewage treatment sludge; (b) aerobic sewage treatment sludge; (c) sewage treatment scum; (d) drinking water treatment sludge. We characterized the samples in terms of their energetic potential—by thermal analysis—and chemical composition—by scanning electron microscopy and X-ray diffractometry. The aerobic treatment sewage sludge and sewage treatment sludge had the highest useful heating value (9.47 MJ kg−1), whereas pure drinking water treatment sludge had the lowest one (4.62 MJ kg−1), which was increased upon blending with anaerobic sewage treatment sludge (7.29 MJ kg−1). Sewage treatment scum and aerobic treatment sewage sludge were mainly composed by quartz and gypsum, and both the blends and pure samples had the same crystalline structure. In conclusion, mixing aerobic/anaerobic sludges and sewage treatment sludge/drinking water treatment sludge improved their energetic potential compared to the pure samples. Thus, blending is a promising alternative to manage water and sewage by-products in a circular economy perspective.

Determination of optimum ordinary Portland cement content in solidifying/stabilizing mineral sludge

Binder plays important role in Solidification/Stabilisation (S/S) technique for sludge treatment. However, mineral sludge namely water treatment sludge (WTS) and ceramic sludge (CS) are rarely treated using S/S technique. Therefore, this study was conducted to obtain optimum percentage of Ordinary Portland Cement (OPC) content as a binder in S/S technique to treat the mineral sludge. Twenty (20) OPC mix proportions at 10% to 100% OPC with 10% increment were prepared to treat both 200 g WTS and 200 g CS. Binder-to-sludge (B/Sd) ratio of one (1) was used. Air curing was applied for all mixes. Compressive strength was conducted at 28 curing days. The compressive strength of treated mineral sludge was then compared to the requirement stipulated in Waste Acceptance Criteria in Landfill at 0.34 MPa. It was found that the optimum percentage of OPC to treat 200g WTS and 200g CS were 50% and 60% respectively.

Properties and microstructure of concrete blocks incorporating drinking water treatment sludge exposed to early-age carbonation curing

In recent decades, industrial by-products have gained significant attention for their potential as components of more environmentally friendly construction materials. In this context, this paper presents the manufacture of concrete blocks (CB), in which sand was replaced with oven-dried drinking water treatment sludge (DWTS). In addition, CB with DWTS contents ranging from 0% to 30% by weight were exposed to early-age carbonation curing. Experiments were conducted to determine the compressive strength, splitting tensile strength, and water capillary absorption of CB subjected to normal or early-age carbonation curing. The results indicated that DWTS degraded durability and mechanical properties of CB because of the high-water absorption and high organic content of DWTS. However, early-age carbonation curing was found to improve the overall performance of CB with DWTS, such that the carbonated CB mixtures satisfied the strength requirement of load-bearing blocks. The pH values of CB after carbonation curing increased with increasing content of DWTS. Microstructural analyses showed that the addition of DWTS into CB caused the formation of ettringites because of the presence of alum and gypsum in DWTS, and early-age carbonation curing decomposed these ettringite into calcium carbonates. The results also showed that the production of crystalline CaCO3 under carbonation had a filling effect that refined the pore sizes. Thus, the findings of this study indicate that utilisation of DWTS in CB offers significant environmental and health benefits via increased greenhouse gas absorption, as well as reduced DWTS disposal in landfills and unsustainable sand extraction.

Preparation of a new low-cost substrate prepared from drinking water treatment sludge (DWTS)/bentonite/zeolite/fly ash for rapid phosphorus removal in constructed wetlands

With the increase of tap water demand and treatment volume, the by-product of the water supply plant-drinking water treatment sludge (DWTS) is increasing, and its final disposal urgently needs to be reasonably resolved. Therefore, the reuse of DWTS can not only solve the “waste” problem but also generate favorable economic benefits. This is the first study to use DWTS to prepare a regular, industrialized and efficient DWTS composite substrate (DWTSCS) for phosphorus removal in constructed wetlands by using DWTS as the main material and bentonite, zeolite and fly ash as the additive. The optimal weight ratio of DWTSCS was determined by combining orthogonal test and mixture design experiments: cement = 22.32%, DWTS = 51.62%, bentonite = 13.03%, zeolite = 4.34%, fly ash = 8.69%. The microstructure and phase analysis were performed using SEM and XRD. The static adsorption experiments showed that the adsorption behavior of DWTSCS to phosphorus conforms to a quasi-second-order kinetic model and the adsorption process can be simulated using Langmuir and Freundlich models. The maximum adsorption capacity of phosphorus by DWTSCS was calculated as 40 mg/g, and the adsorption of phosphorus with the DWTSCS was a spontaneous exothermic process. Under acidic conditions, it was favorable for DWTSCS to adsorbed phosphorus. The concentration of adsorbed phosphorus with the DWTSCS ranged from 0.5 mg/L to 0.2 mg/L. This research provides a basis for the application of DWTSCSs in constructed wetlands.