clarifying tank Articles

  • Why Choose An MBBR Bioreactor to Optimize Your Sewage Treatment Process

    In both municipal and industrial settings, dealing with the organic matter in wastewater can be difficult. As regulations for treated wastewater become more and more stringent, municipalities and commercial/industrial organizations are looking for technology that can meet environmental demands. For organic materials, one of the most effective methods of treatment is integrating a biological ...

  • Novel method for sludge blanket measurements

    The most widely used methods for sludge blanket measurements are based on acoustic or optic principles. In operation, both methods are expensive and often maintenance-intensive. Therefore a novel, reliable and simple method for sludge blanket measurement is proposed. It is based on the differential pressure measurement in the sludge zone compared with the differential pressure in the clear water ...


    By IWA Publishing

  • Egg Processing

    Problem: This eggplant, located in Southern California, pro¬duces approximately 6 million eggs per week. During the process and preparation of these eggs, some break and fall on the floor where they are washed into floor drains and mixed with the egg wash water. The mixture of broken eggs and wash water is discharged to a balance tank and then sent through a settling ...


    By HydroCal Inc.

  • The role and control of sludge age in biological nutrient removal activated sludge systems

    The sludge age is the most fundamental and important parameter in the design, operation and control of biological nutrient removal (BNR) activated sludge (AS) systems. Generally, the better the effluent and waste sludge quality required from the system, the longer the sludge age, the larger the biological reactor and the more wastewater characteristics need to be known. Controlling the reactor ...


    By IWA Publishing

  • Case study - Lee County Water Utilities (LCWU)

    Location: Fort MYers, FL System Applied: PW1010 – Visuron Technologies, Inc. Substrate / Area: Metal tank primary containment Date Completed: July 2002 Project Description Lee County Water Utilities (LCWU) needed to re-coat launderer in their clarifier. The multiply layer of paint was failing after 1 year of resurfacing. Polyurea ...

  • Decentralized Sewage Manila, Philippines - Case Study

    Situation A large urban water authority in the Philippines wanted to reduce power consumption and treat sewage for environmentally friendly discharge to nearby water ways. Solution Four BioGill bioreactors were retrofitted to the existing decentralized Sewage Treatment Plant (STP). Design The modified process saw the aeration ...


    By BioGill Operations Pty Ltd

  • A technical guide to complying with Federal SPCC Regulations

    Let’s start by clarifying what SPCC is not since SPCC does overlap other Federal and State environmental regulations. SPCC is not: NPDES – Permits under NPDES, such as stormwater or water discharge permits, are required to discharge pollutants into the “navigable waters of United States.” While it is never permitted to discharge “oil” into any waters of the US, there is some overlap with NPDES in ...


    By Ecocion, Inc.

  • Sütaş Aksaray & Karacabey Project - Case Study

    Customer: Arbiogaz (Turkey) Project Name: Sütaş Aksaray & Karacabey Project Manufacturing year: 2007 etc.; Material: CS + Sand B. + Epoxy Coating Scope of supply 1 +1 pcs. ...


    By ASTIM A.S.

  • N2O emission from full-scale urban wastewater treatment plants: a comparison between A2O and SBR

    The emission of nitrous oxide (N2O) from full-scale anoxic/anaerobic/oxic (A2O) and sequencing batch reactor (SBR) processes was measured to evaluate N2O emission from urban wastewater treatment plants (WWTPs). The results showed that N2O flux in the A2O WWTP followed an order of A2O-oxic zone > aerated grit tank >> ...


    By IWA Publishing

  • Case Study - KIA E-Coat Wastewater and Treatment Process

    KIA Automotive uses a water-borne Electrodepostion (E-Coat) paint process that produces various wastes including rinse waters containing Zinc (Zn), Nickel (Ni) & phosphorous (P) waste. Most of the waste is found in the rinse waters from the e-coat overflows that contain less 1000 mg/l TSS. Some of the “dumps” contain detactified paint waste concentrate in small quantities. The various ...

  • Case study: Municipal WWTP

    OverviewThe municipal WWTP at Monclova, Mexico had to increase its capacity by a factor of 1.5 and improve nitrification capacity, for 100% reuse by industry.  RequirementsThe city of Monclova operates a modern wastewater treatment plant which receives urban and industrial wastewater. A retrofit for an increase of 50% in capacity was required, as well as improvement in ...

  • Treatment of farm dairy effluent with hybrid upflow multilayer bioreactor and activated sludge module

    Biological removal of nitrogen and carbon from farm dairy effluent (FDE) was studied with two laboratory-scale systems following nitrification and denitrification processes. Each system consisted of an upflow multilayer bioreactor (UMBR) as a pre-denitrification unit, an aeration tank (AT) as nitrification unit and a secondary clarifier. The optimization of two operational variables, total ...


    By IWA Publishing

  • Columbus, Texas - Case Study

    The Columbus WWTP was receiving an overload of grease from restaurants. Some of the grease was traveling only 150 yards before discharging directly into the WWTP. Because of the grease received at the plant, there was little settling occurring in the 30-minute settling tanks, despite personnel maintaining a low mixed liquor in the aeration basin. The plant was hauling off up to seven loads of ...


    By BioCOPE Inc.

  • Algae Control Spray System for a southern Nevada Wastewater Treatment Plant

    Nicknamed "NESI" by the facility staff both because of its large size and slight  resemblance to the mythical Lochness Monster, this WeirWasher Automated Cleaning System also has the important ability to submerge, resurface, and telescope.  These motions are necessary to control the prolific algal growth on the weirs and effluent launder in the circular secondary clarifier. The ...


    By GillTrading.com, Inc.

  • NEFCO, incorporated case history

    In mid-2007, the wastewater treatment plant in Monclova Mexico was faced with a dilemma. The City had just upgraded their biological treatment scheme to increase flow through their plant by 35%, from approximately 11.5 mgd to15.5 mgd. They needed to add either a fourth secondary clarifier to keep within they discharge limits of 10 ppm TSS, or improve the operation of their three existing ...


    By NEFCO, Inc.

  • Influence of powdered Moringa oleifera seeds and natural filter media on the characteristics of tapioca starch wastewater

    Moringa oleifera tree is indigenous and highly abundant in Indonesia and its seeds are widely known to be used as a natural coagulant for treating wastewater. Wastewater from tapioca starch industry, particularly in Indonesia, which contains high organic matters, was revealed by high biochemical oxygen demand (BOD) and chemical oxygen demand (COD) value. In this study the combination of powdered ...

  • A laboratory experimental system for infiltration studies

    The investigation of a few hydrological processes under natural conditions can be distorted by their interactions. In this context, a laboratory system that allows a few mechanisms of the infiltration process to be studied univocally is presented. The core component of the system is a physical model consisting of a soil tank with slope angle, γ, adjustable from 1 ° to 15 °. A generator of ...


    By IWA Publishing

  • Innovative use of lamella clarifiers for central stormwater treatment in separate sewer systems

    Lamella settlers have been used in the past few years for the sedimentation of particles in wastewater and stormwater applications. A new and very innovative approach for the treatment of stormwater flows is proposed which extends the portfolio of solutions beyond traditional settling tanks. Surface runoff is stored in a sewer or a basin and finally treated in a small but continuously operated ...


    By IWA Publishing

  • Examination of sludge accumulation rates and sludge characteristics for a decentralized community wastewater treatment systems with individual primary clarifier tanks located in Wardsville (Ontario, Canada)

    In conventional septic systems, settling and partial treatment via anaerobic digestion occurs in the septic tank. One of the byproducts of solids separation in the septic tank is a semi-liquid material known as septage, which must be periodically pumped out. Septage includes the liquid portion within the tank, as well as the sludge that settles at the bottom of the tank and the scum that floats ...


    By IWA Publishing

  • Municipal: Harestua, Norway

    Project Name: Harestua Wastewater Treatment Plant Location: Oppland County, Norway Type of Plant: Municipal - Retrofit Technology Used: Biowater CFAS Biomedia Used: Biowater BWT-X Operational Since: 2011 The Challenge The Harestua STP plant was a ...


    By Biowater Technology AS

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