sludge thickener and sludge digester facilities

Digester Upgrades Down Under | WWD

The recuperative thickening system connects to each active digester to draw digested sludge from the digester at 3 to 4.5% total solids (TS) and return thickened sludge in the order of 6 to 10% TS. After the refurbishment of two digesters, an average SRT of 30 days was achieved with only two digesters online.

Sludge Thickening -

The thickened sludge, containing approximately 6% solids, is transported to the anaerobic digester via a progressive cavity pump. Ferrous chloride is added to the thickened sludge to reduce odors and control hydrogen sulfide levels.

Optimizing Aerobic Digestion - KWWOA

Oct 17, 2019 · Primary sludge would also impact oxygen uptake conditions. This would be an excellent “tool” to continue to drive the process for a rapid drop in ORP. • Facilities with primary sludge maintain a seed inventory in the digester to assimilate the fresh feed solids and control odors and oxygen uptake rate. •

Wastewater treatment plant Building resilient, safe and

available volume in sludge thickener or clarifier • VSD on the holding tank sludge pump provides constant feed to digesters • Include a sensor measuring pH tied to a alkalinity feed pump 2 ANAEROBIC DIGESTER Anaerobic digestion is a collection of processes by which micro-organisms break down biodegradable material in the absence of oxygen

Sludge Thickening Technologies Reduce Wastewater COD and

Sludge Thickening. The thickening of activated sludge is a common practice many wastewater treatment plants. These plants use a biological treatment process to reduce the wastewater COD and BOD before discharging downstream into the environment.


Location of the thickener in a wastewater treatment plant is important. If sludge is to be digested, thickening a blend of primary and waste activated sludge is a good practice. If these sludges are to be dewatered, then they should be thickened separately and mixed immediately before dewatering [3]. Sludge Thickening vs. Dewatering

Utilization of high solid waste activated sludge from

For small facilities, high solids sludge is suitable for transportation to a centralized co-digester, and direct utilization of the digested sludge as liquid fertilizer is recommended. Effects of high solid and hyperthermophilic pretreatment (80 °C, 24 hr) on anaerobic digestion at low temperatures and utilization as fertilizer are ...

Anaerobic Digestion Fundamentals - WEF Home

An additional intermediate step prior to digestion may include solids thickening. In this process, the water content of primary and/or waste activated sludge is reduced. Process examples include gravity thickening, rotary drum thickening, and gravity belt thickening. By reducing the overall volume of digester feed sludge, thickening may reduce the

Weltec Biopower to build AD unit for German sewage facility

This design stands out with much lower investment costs than a conventional digester, according to Weltec, and, therefore, is an optimum solution for smaller wastewater treatment plants. The new static sludge thickener, which is equipped with a submersible mixer and has a capacity of 342 m 3, is also made of stainless steel. A 226-kW CHP unit ...


Location of the thickener in a wastewater treatment plant is important. If sludge is to be digested, thickening a blend of primary and waste activated sludge is a good practice. If these sludges are to be dewatered, then they should be thickened separately and mixed immediately before dewatering [3]. Sludge Thickening vs. Dewatering


CASE’STUDY:’SLUDGE’THICKENING’RTC’ MOGDEN,’UK’(THAMES’WATER)* • 76 MGD WWTP • Polymer savings = 35% reduction. • Thickened sludge increased from 4.5% to 5.5%

PDF Introduction to Sludge Handling, Treatment and Disposal

3. SLUDGE THICKENING. Thickening is provided to reduce the volume of sludge. Two basic types of thickeners work by gravity or flotation and use either continuous or batch processes. Gravity thickeners are essentially settling tanks with or without mechanical thickening devices (picket fence type). Plain settling tanks can produce

Sludge Thickening and Dewatering | Sludge Treatment System

Sludge thickening and dewatering is two important stages in treating sludge. Thickening is the first step of sludge treatment in which the solids concentration is increased and the total sludge volume is correspondingly decreased, Thickening commonly produces sludge solids concentrations between 15% and 20%, LZZG Deep Cone Thickener results in maximum water recovery, maximum underflow density ...

Northeast Water Pollution Control Plant New Gravity Thickener

Thickened sludge will inventory in a wet well and will be pumped to an existing well located in the Sludge Thickener Building, where it will be mixed with thickened biological solids and pumped to the digesters. Odorous air will be exhausted from the facilities into a biofilter odor control system. Construction is anticipated to begin in 2015.

Controlled Aerobic Digestion of Thickened Sludge: Challenges

Dec 28, 2000 · More and more facilities are opting for the latter solution and are installing belt thickeners or drum thickeners to increase the solids content of the digesters to 4% to 6%. While this brings the treatment plant into compliance under the new 60-day detention requirements, it creates a whole series of new problems if the digester is not ...

Membrane Thickening Aerobic Digestion Processes

Membrane Thickening Digestion Ideal for: Facilities obligated to meet stringent nutrient discharge limits, specifically total nitrogen and phosphorus Decentralized facilities or Reduced operations staff Class B Applications Aerobic digestion process using a Flat Plate Membrane Unit

Sludge Processing - JWCE

Sludge Processing Sludge biosolids processing in a resource recovery facility is a critical operation for efficient running of any plant. For some facilities it is also the feed process into generating electricity, harvesting biogas, and producing reusable biosolids.

PDF) Comparison of different thickening methods for active

Both recuperative thickening and final dewatering can be regarded as comparable processes. In the case of recuperative thickening, digester sludge is thickened to 6%e12% through a range of ...

Sludge digestion - SUEZ Group

Depending on the quantity and the nature of the sludge (biological, mixed, etc.), different types of digestion are possible: mesophilic digestion at 37°C; Digelis Smart: integrated mesophilic digestion and biogas storage Digelis Smart combines sludge digestion and the storage of biogas to offer a compact, practical and economical solution.

Sludge Thickening - Degremont

Extremely dilute sludge delivered by the water line (usually 99 to 99.8% water)is concentrated to produce sludge containing 90 to 96% water. This sludge is still fluid and, therefore, can be pumped out. Thickening constitutes an additional investment cost and a source of possible nuisances.


Activated sludge SRT = 40 days Desired VSS destruction in digester = 45% Design temperature = 20°C From previous figure, °C x days = 1100 Required digester detention time = 55 days Thus, only an additional 15 days of digestion time is needed; additional VSS destruction ≈ 3%; oxygen requirements in digester are small.


– SLUDGE THICKENERS As the first step of sludge handling, the need for sludge thickeners to reduce the volume of sludge should be considered. Particular attention should be given to the pumping and piping of the concentrated sludge and possible onset of anaerobic conditions in sewage sludge. Sewage sludge should be thickened to at least 5% ...

Alfa Laval - Sludge treatment

On-site thickening and dewatering of sludge is a fundamental part of all current wastewater treatment processes to reduce sludge volume, waste disposal cost and meet sustainability requirements. It is also highly relevant for sludge to be used as digester feed for …

Sludge Thickening - an overview | ScienceDirect Topics

In one co-digester plant of sewage sludge and biowaste in Finland, the siloxane concentration varied from 0.05 to 0.15 ppm (average about 2.4 mg/m 3) during a 5 day measurement period [17] and similarly relatively low values have been reported for three other Finnish WWTPs studied (Table 4).

Northeast Water Pollution Control Plant New Gravity

WRA designed new Gravity Thickener Facilities to reduce odor emissions from the Northeast Water Pollution Control Plant and provide a more consistent primary sludge concentration to the digesters. The Gravity Thickener Facilities were designed to mitigate odor emissions from the existing Set 2 Primary Sedimentation Tanks (PSTs).

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