Electrokinetic dewatering of a phosphate clay was investigated in an experimental program. The results show that the velocity of sedimentation is …

AbstractChemical precipitation using magnesium salt is an effective technology for recovering phosphorus and ammonium nitrogen from wastewater. Effects of pH, Mg/P ratio, stirring rate, and seed crystal (SC) dosage on phosphate removal efficiency (PRE) and average particle diameter (APD) of precipitates were investigated for reject water from …

Abstract. This work focuses on the dewatering of phosphatic clay waste of Egyptian Abu-Tartur phosphate ore by flocculation using polyacrylamides to enhance the dewatering rate and recycling of ...

Expulsion of process water that filters down the mine is a difficult process due to the accumulation of impurities, complex dewatering flows and high head requirements of pumps due to underground ...

In the wet process, phosphate rock is reacted in a slurry of phosphoric acid and calcium sulfate crystals containing a controlled quantity of sulfuric acid. The simplified reactions for the dihydrate process is as follows: ... Such a low moisture would call for a dewatering step for ground Florida pebble rock. Producers in Florida have thus far ...

The advanced anaerobic digestion process enhances sludge resource utilization. However, thermal hydrolysis pretreatment of anaerobically digested sludge reduces dewatering efficiency due to excessive organic matter decomposition. This necessitates significant time and effort for sludge conditioning in wastewater treatment …

Optimization of phosphorus removal from reject water of sludge thickening and dewatering process through struvite precipitation. Weichao Ren., Zhen Zhou., Li Wan., Dalong …

In Tunisia, phosphate beneficiation from ores by the Gafsa Phosphate Company (GPC) is a water-intensive process that generates large amounts of sludge. Responsible mining minimizes water use and prioritizes its recycling and reuse to limit the impact on water resources. Recovery of water from the phosphate sludge (PS) using the …

during the mining and processing of the phosphate rocks. Other examples of slow settling suspensions include red mud, acid mine drainage sludge, and coal slimes. Large ...

I claim: 1. Process for the treatment of a precipitate starting material to produce a first final product, said process comprising dewatering of the precipitate starting material, wherein the precipitate starting material is a precipitate based on at least one substance of a magnesium ammonium phosphate, a magnesium potassium phosphate or a potassium …

By David BardsleyApril 12, 2022. Construction dewatering is the process of removing groundwater from a construction site to provide a safe and stable subgrade for excavation. Groundwater is removed from the site using deep wells, wellpoints, eductors, or conventional "sump and pump" methods. Dewatering may be temporary during …

It serves as a conversion coating where the components are immersed in a hot dilute solution of phosphoric acid and phosphate salts which chemically react with the surface, forming a layer of insoluble crystalline phosphates. For greater corrosion resistance, a specially formulated dewatering oil is applied after the phosphating process, it is ...

The phosphate ore processing can be divided into three stages: crushing—separation—concentrate dehydration. 1. Ore crushing process includes crushing, screening, grinding and grading processes. Use crushers and ball mills to reduce ore particle size to dissociate phosphorus minerals from impurity mineral monomers.

Abstract. At Harnaschpolder wwtp phosphate removal from wastewater and sludge dewatering is optimised by dosing magnesium hydroxide to digested sludge. To …

100-199 Employees. Distributor of new & used dewatering equipment including sludge & zinc phosphate sludge dewatering equipment. Available in maximum volumes from 1300 gpm to 2250 gpm, maximum head sizes from 100 ft. to 165 ft., maximum suction lifts from 25 ft. to 30 ft., vacuum pressures from 10 cfm to 74 cfm & fuel capacities from 24 gal to ...

Waste clay, a phosphate ore process tailing, contains a remarkable amount of critical materials such as P and REEs so that comparing to different phosphate ore process streams, waste clay presents the highest concentration of REEs after phosphate rock. ... The lowest power demand for a mechanical and electrokinetic dewatering …

The process for electro-sedimentation, dewatering and consolidation of Florida phosphate slime by the process of placing an anode at the bottom of a holding facility for the storage of the phosphate slime; filling the holding facility with phosphate slime; placing a cathode on the surface of the solid portion of the phosphate slime but below the surface of any …

Dry weight of immobilized beads and water removal efficiency in dewatering process with 24–25 °C temperature and 68–71% humidity, water removal percentage at 97% is marked in red for comparison (d). ... Nitrogen was necessary for promoting phosphate removal at low N/P (Kube et al., 2018), so phosphate was removed 80% …

The plant treats 84,000 PE using biological phosphorus removal. The wastewater stream used in this study is termed reject water, which for this particular plant is a mixture of the liquid phase from the dewatering process before and after the digester. The composition and the characteristics of the reject water are given in Table 1. The MD …

Overview of sludge thickening and dewatering. Thickening and dewatering processes both provide a concentrated, consolidated product − retaining most of the solids from the original sludge – along with a diluted stream which is predominantly water. For both process types the dilute stream is usually directed back to the inlet of the …

Optimal acid pH of 3.0 was proposed for satisfied phosphate recovery. • Total dissolved phosphate was 37.3-flod higher than that at natural pH. • Phosphate was primarily obtained from degradation of short chain polyP. • WAS dewatering performances were improved after acid treatment. • Released P was recovered in form of FePO 4 …

The principle methods of mechanical dewatering of sludge are centrifuges and filter presses. The mechanical sludge dewatering with filter presses guarantees more efficient volume reduction. If the cake dryness rates of centrifuges and filter presses are compared, the dryness rate of filter press is two times higher on average (GlobalSpec ...

The zinc phosphate coating process produces a solid byproduct called "sludge" in addition to the desired solid coating on the metal surface. While using the zinc phosphate solution, sludge eventually has to be removed from the bath and disposed of properly. Zinc phosphate sludge reduction and removal are of interest for manufacturers …

As an alternative process to chemical struvite precipitation, a recent study demonstrated the ability of selected bacteria to form bio-struvite in activated sludge liquors and in dewatering ...

Construction dewatering methods refer to techniques such as wellpoints, deepwells, bypass and flood control. In wellpoint and deepwells submersible pumps are installed in a drilled well shaft, while in bypass and flood control pumps are placed in the area that needs to be dewatered. Let's review these common techniques.

A lab-scale struvite pellet crystallization system was used to study phosphorus (P) removal and recovery from sludge dewatering liquor (SDL). Influences of total suspended solids (TSS) and phosphate concentrations on P removal as well as the size, morphology, purity, and components of struvite pellets were investigated.

The purpose of dewatering is to remove water from a material or structure so that it can be reused or disposed of in a safe manner. Without this process, many materials would be unusable or pose a safety hazard. Dewatering can be used for a variety of purposes, including: Lowering the water content of slurry prior to transport.

Since its inception, the Florida Institute of Phosphate Research (FIPR) has been pursuing an economical, practical, and environmentally-sound technique for dewatering phosphatic clays. ... Part one gives a chronological account of the development work leading to a new process for rapidly dewatering waste slurries, particularly phosphatic clays ...

Electrokinetic dewatering of a phosphate clay was investigated in an experimental program. The results show that the velocity of sedimentation is controlled by the applied current density and that electro-osmotic permeability dominates the effectiveness of electrokinetic consolidation. The intermittent current and polarity reversal …

Currently, the recovery and reuse of phosphorus (P) from wastewater is only considered viable for the return liquors from digestion or dewatering operations. …

An example is phosphate mining, where a typical phosphate mine generates a clay–water slurry, called phosphatic clay, at a rate of 8200 L/s with a solids content of 2–3 wt% [27]. McKinney and Orazem [ 64, 65 ] performed simulations of in-situ EKD of settling areas for phosphatic clay and concluded that a continuous process was …

includes early dewatering experiments, fundamental studies of clays and of flocculation,and minor dewatering techniques. These include freeze-thaw methods, the ANDC0 3 process,moving screens, sand wick, crust development, and overburden pumping. Methods under current evaluation

The reason that the dewatering process is so heavily regulated by both the federal and state government is simple: untreated water removed from construction sites during dewatering operations may contain certain pollutants that could negatively impact local natural water courses or storm drainage systems. ... such as nitrogen and …

In this methods of dewatering, a wall of frozen clay is made by, freezing the moist soil of the area where the excavation is to be carried out.. The process of freezing method of dewatering is as follows:. Large pipes of 10 to 15 cm diameter are laid in the ground around the area where excavation is to be done. The spacing between such …

A cost-effective method for the treatment of reject water from sludge dewatering process using supernatant from sludge lime stabilization ... was applied before the phosphorus in sludge was recovered with the magnesium ammonium phosphate (MAP) process. As a result, the solubilization rate of excess sludge achieved approximately 80% and about 94 ...