WASTE WATER TREATMENT

MUNICIPAL & INDUSTRIAL WWTP

TABLE OF CONTENTS

• AB PROCESS• OXIDATION DITCH

• AO PROCESS• ACQUISITION ACTIVITY

AB PROCESSPRINCIPLE

• High sludge range in the A-stage with SR greater than 2 kg BOD/(kg MLSS x d)

• Separation of the biogenesis of the respective stage

• Possible varying of operational methods in the A-stage, i.e. aerobic or facultative anaerobic operational

• methods adapted to the sewage water ingredients

• process engineering generally without preliminary clarification in order to maintain better utilisation of the microbiological reaction mechanism.

• Compared with simple one stage or anaerobic process technologies– Investment savings 20 % - 30 %

– Energy savings 20 % approx.• Less sensitive to peak loads such as pH, COD, BOD5, nitrogen, etc. • A-stage can receive a 50 to 100 times higher organic load than a

conventional activated sludge stage.

• Short bacteria generation times in the A stage; highly varied microbiological potential; high variability and high mutation and selection capacity generate a bacteria community capable of responding and adapting rapidly to specific load conditions.

• Better and more balanced results can be reached with a multistage process system than with a one stage system.

• A continuously operating system that is constantly supported andinoculated from the outside shows a high process stability.

AB PROCESS ADVANTAGES

THE AB PROCESS IS SUITABLE FOR MOSTS INDUSTRIAL APPLICATIONS

• Examples:– Waste Water from Paper Mills

– Waste Water from the Pesticide Industry

– Waste Water from the Textile Industry

– Waste Water from the Dairy Industry

– Waste Water from the Tannery Industry

– Other Waste Waters

• COD of the effluent from the sewage treatment plant before and after installation of anaerobic pretreatment

• AB Process Flow Chart for Paper Mills

• Flow Chart of Combined Municipal WWT with 40% Textile Waste Water

• Flow Chart of Combined Waste Water Treatment with 60% Tannery Waste Water

• Flow Chart for Tannery WWT

OXIDATION DITCH WWTP

• DOUBLE DITCH & TRIPPLE DITCH

•Completely self-contained treatment process. •Consistently produces a fully nitrified effluent, low in BOD and suspended solids, without the use of clarifiers.

•Increased process stability and decreased operating complexity compared to SBR's. •Constant water level and continuous discharge, which lowers the surface settling rate, lowers the weir overflow rate, optimizes the aeration unit process and eliminates the periodic surges of effluent associated with SBR's.

•The D-Ditch Process operating cycle consists of two main phases (A & C), and two intermediate phases (B & D).

The operation cycles scheme showing phases C & D and phases A & B as complimentary systems

During Phase A, the influent is directed to the ditch under aeration (Ditch 1). The rotors aerate the mixed waste water, resulting indegradation of the influent BOD and nitrification of ammonia-nitrogen. The rotors are idle in Ditch 2, which is serving as a clarifier. The mixed liquor flows from Ditch 1 to Ditch 2 because the ditches are hydraulically interconnected by a port in the common wall, and the effluent weir in Ditch 2 is lowered to allow treated and clarified effluent to be discharged.

During Phase B, the influent is redirected into the discharge channnel to Ditch 2, which continues to operate in the settling and discharge mode. The duration of Phase B is relatively short, and the volume of influent received small in comparison to the volume inDitch 2. Therefore, the influent has little effect on the treated effluent being discharged. Ditch 1 is isolated.

The rotors in Ditch 1 are idle in Phase B so as to allow the sludge blanket to drop in preparation for Phase C, when Ditch 1 will begin discharging effluent.

Phase C is initiated by raising the effluent weir in ditch 2, and lowering the effluent weir in Ditch 1. The rotors are activated in Ditch 2, which continues to receive influent. The hydraulic gradient through the ditches has been reversed. Ditch 1 serves as a clarifier settling solids and discharging treated effluent.

The D-Ditch can easily be expanded and upgraded by either adding another oxidation ditch and operating the Triple Ditch Process, or by adding clarifiers and operating a BioDenitro Process.

• The Biodenitro Process

AO PROCESS

DESCRIPTION

The A/0 process improves upon the activated-sludge process by using an anaerobic selector to develop biomass. This biomass first stores BOD anaerobically and then assimilates phosphorus in a subsequent oxic, or aerobic zone. Because its operation uses anaerobic uptake of BOD, the process particularly resists hydraulic and organic upsets. It also minimizes the presence of Nocardia and other sludge-bulking organisms commonly found in activated sludge plants. The A/0 process for secondary treatment has been proven reliable and cost-effective through extensive pilot testing and actual full-scale plant operation.

APPLICATIONS

Secondary or advanced treatment requirements with air- or oxygen-activated sludge. Process control problems resulting from sludge-bulking or wide swings in organic loading. Increase of designed organic load but limited available space. Discharge standard requiring nutrient control in the future.

FEATURES AND BENEFITSNon-Bulking Sludge:Resistant to proliferation of bulking organisms.

Superior Settling Characteristics:Settles rapidly and compacts well. Precise process control. Improved thickening and dewatering properties. Improved Stability:Anaerobic selector permits operation over a wide range of hydraulic and organic loading conditions. Ease of Operation: Equipment is common to most treatment plants. Physical layouts and flow schemes are similar to conventional activated- sludge plants. Reduced Construction Cost:High-rate design results in less tankage. Better use of existing facilities. Air or Oxygen Aeration:Compatible with either air or pure oxygen aeration systems (e.g., OASES ).

ACQUISITION ACTIVITY 1999

• ECI Attends to the Whole or Part of– Project Identification– Project Acquisition

– Project Management– Engineering– Procurement

PROJECTS UNDER ACQUISITION IN 1999

• Nansihu WWTP

– Including Jining WWTP 200,000t/d, TengzhouWWTP 80,000t/d, Qufu WWTP 40,000t/d, Yanzhou WWTP 40,000t/d

• A German government financed project

• Local manufacturing and equipment installation partner contracted by ECI on behalf of general contractor

• Local lobbying managed by ECI

• Dairy WWTP

– Including Hebei WWTP 100t/d, Dalian WWTP 100t/d, NanchangI WWTP 600t/d, NanchangIIWWTP 800t/d, Heilongjiang WWTP 1,200t/d

• An EU financed projectComplete price inquiry by ECIECI in consortium with local supplier and German Designer

• Chongqing pesticide WWTP (350t/d)

– Contracted on behalf of European engineering company

– Complete bidding and lobbying by ECI

– Identification of local subcontractors

• Sannong Pesticide WWTP (550t/d )--- Rehabilitation of existing plant

• Linyi WWTP (100,000t/d)Partly financed by German government loanIdentification of local partner and lobbying

• Keqiao dyeing WWTP (300,000t/d)Partly financed by Japanese OECF loanProcess identificationLobbying Organizing of bidding consortium