Settlers Articles
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Sludge reduction and performance analysis of a modified sludge reduction process
A modified sludge process reduction activated sludge (SPRAS) technology was developed by inserting a sludge process reduction (SPR) module, composed of an aeration tank and a settler, before the activated sludge system was proposed in this study. Compared with the anaerobic/anoxic/aerobic (AAO) process, the SPRAS resulted in a remarkable decrease in sludge production by 76.6%; sludge ...
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Growth of microalgal biomass on supernatant from biosolid dewatering
The paper reports the results of an experiment to assess the feasibility of including a photobioreactor within the design of a wastewater treatment plant, growing microalgae on the centrate from anaerobic sludge dewatering. The growth of algal biomass would take advantage of the available nitrogen and provide a substrate for biogas production by anaerobic digestion. Tests were carried out by ...
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Lamella settlers for storm water treatment – performance and design recommendations
Three lamella settlers were monitored over a period of 4 years. The main objective was to determine removal efficiencies for total suspended solids and associated pollutants. For this purpose a new sampling method based on large volume solid samplers was developed allowing a detailed analysis of solids. With regard to total suspended solids the average removal efficiency of the plants range ...
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Performance evaluation of a novel open trickling filter for the post-treatment of anaerobic effluents from small communities
The objective of the work is to evaluate the performance of an innovative design of a trickling filter for small population sizes, which has been implemented for the post-treatment of sanitary effluent from a UASB (upflow anaerobic sludge blanket) reactor. The unit, named open trickling filter (OTF), operates with no side walls, no perforated bottom slab and no secondary settler. The OTF ...
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Evaluation of DEWATS in Java, Indonesia
Under the Indonesian PPSP (Accelerated Sanitation Development for Human Settlements Program) thousands of new DEWATS (Decentralized Wastewater Treatment Systems) may be realized in the coming five years. Taking the massive scale of planned implementation into consideration an evaluation of the technical and financial-economic aspects and users' involvement for three different types of ...
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A retrofitted activated-sludge plant with sequential nitritation and anammox obtains dischargeable effluent
Abstract New Activated Sludge (NAS) represents a hybrid, floc-based nitrogen removal process, based on the control of solids retention times (SRT) and dissolved oxygen (DO) levels. The aim of this study was to examine the performance of a full-scale NAS plant, which treated anaerobically digested industrial wastewater. The batch-fed partial nitritation step oxidized nitrogen to nitrite (45-47%) ...
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Water recycling project - Durban South Africa
1. Overview and key points South Africa’s first private water recycling project, operating on a 20 year Buy-Operate-Transfer (BOT) basis has turned out to be a success. Constructed in order to treat Durban’s wastewater, it provides a good example of Public Private Partnership (PPP), where appropriate wastewater treatment technology was used in order to provide effluent of a ...
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Shall we upgrade one-dimensional secondary settler models used in WWTP simulators? – An assessment of model structure uncertainty and its propagation
In WWTP models, the accurate assessment of solids inventory in bioreactors equipped with solid-liquid separators, mostly described using one-dimensional (1-D) secondary settling tank (SST) models, is the most fundamental requirement of any calibration procedure. Scientific knowledge on characterising particulate organics in wastewater and on bacteria growth is well-established, whereas 1-D SST ...
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Influent concentrations and removal performances of metals through municipal wastewater treatment processes
This extensive study aimed at quantifying the concentrations and removal efficiency of 23 metals and metalloids in domestic wastewater passing through full-scale plants. Nine facilities were equipped with secondary biological treatment and three facilities were equipped with a tertiary treatment stage. The metals investigated were Li, B, Al, Ti, V, Cr, Fe, Ni, Co, Cu, Zn, As, Se, Rb, Mo, Ag, Cd, ...
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Zhuhai --a membrane based water treatment plant
The Facility At the time it was built, the Guangdong Zhuhai Power Station set a number of firsts for China. Not only was it the largest thermal power plant in terms of unit size , it was the first to use Reverse Osmosis Water Treatment and it was the first to be financed without a multilateral or government guarantee. Zhuhai was also EPC Mitsubishi Heavy Industries’ first turnkey contract ...
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Enhancement of settling tank capacity using a new type of tube settler
The effectiveness of a newly developed lamellar settler was confirmed by onsite experiments. The device had inclined parallel plates arranged in a vertical direction in a settling tank. This vertical arrangement method enables many more plates to be set compared to the conventional horizontal arrangement. As an original and distinctive innovation, both the right and left edges of the plates were ...
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Parameters affecting steady-state floc blanket performance
A laboratory-scale reactor was used to simulate a water treatment process sequence of rapid mix, hydraulic flocculation, upflow clarification with a floc blanket, and lamellar sedimentation to accomplish removal of colloidal particles. This study focused on variables affecting performance of the floc blanket including: provision of hydraulic flocculation, raw water turbidity, coagulant dose, ...
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Kimre Inc. LIQUI-NOMIX oil-water separators
Liquid - liquid mixtures of contaminant oils (or organic solvents) in water (or aqueous solvents) can be separated economically and efficiently with gravity settlers or decanters. To achieve high efficiency separations, the settling unit must include a coalescing stage for removal of small droplets of oil. Kimre Inc.'s LIQUI-NOMIX coalescers provide high efficiency polishing of liquid streams and ...
By Kimre Inc.
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Cost Effective, Easy to Operate H2S Removal in Central China
Documento sin título In 2000, Southwest Oil and Gas Company, a Chinese oil and gas development company, began evaluating H2S removal options to treat the sour acid gas stream from a small amine system treating 400,000 m3/day natural gas in the Longchang area of the Sichuan province in China. The process needed to be flexible enough to operate within a 60–110% range of gas ...
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Clarifiers-No, Filtration-Yes: A Case Study
Problem Twenty miles southeast of Coos Bay, Oregon situated at the conjunction of the North and South Forks of the Coquille River lays the town of Myrtle Point. Just five years ago this community of 2670 residents was facing a large potable water problem with an even larger price tag. The town feeds its water treatment plant from the North Fork Coquille River. Prior to the 1990s the water ...
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MIEX Resin Water Treatment Process
The MIEX®1 Resin process was developed in Australia for the removal of natural organic material in water treatment. This novel, truly continuous ion exchange process, is based on the MIEX® resin – a micro size, macroporous, strong base, magnetic ion exchange resin. The resin was specially developed for this application and optimised for reversible removal of negatively charged organic ions. The ...
By Ixom
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Stormwater and lamella settlers: efficiency and reality
ABSTRACTTwo settling devices treating rainwater from urban drainage areas and equipped with secondary sludge treatment were monitored over a period exceeding one year. The two devices differ in their design and in the quantity and quality of effluents received. Full analyses over approximately 30 mean samples of the intake and discharge effluents allowed judgment of the mean efficiency of ...
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