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CARGILL Lai’an Anhui China Waste water treatment plant for poultry processing AQUA industrial watertreatment Delivery program Complete waste water treatment system comprising design, engineering, manufacturing, installation and commissioning of: Physical/chemical pre-treatment with BioClar® biological treatment INPUT Flow COD 20 BOD5 FOG TSS OUTPUT 3 7.500 m /d 1.850 mg/l 130 mg/l 150 mg/l 700 mg/l COD 20 BOD5 FOG TSS Beginning 2013 AQUA I.W. installed a complete and customized waste water treatment installation for the new poultry processing plant of Cargill, situated in Lai’an, Anhui, China. The production process in Lai’an covers each stage of the poultry supply chain, including chicken breeding, raising, feed production, hatching, slaughtering and processing. All waste water which is originated by the different processes will be treated with the AQUA I.W. water treatment system. Owning to its strong ties with Marel (formerly Stork Poultry Processing) AQUA I.W. has an extensive and advanced knowledge of this production process. Therefor AQUA can provide the customer with tailor made solutions. AQUA I.W. is fully responsible for the design, engineering, manufacturing, installation and commissioning of the waste water treatment installation. This work is primary done in our headquarters in Lichtenvoorde, The Netherlands. Full 24/7 support is available by our large local office in Beijing and the headquarters in Lichtenvoorde, The Netherlands. Middle of 2013 the installation was successfully handed over to the factory team. 70 mg/l 25 mg/l 15 mg/l 60 mg/l Poultry waste water Solution Red water area Due to its unique practical know-how and vast experience in the poultry industry, AQUA I.W. was able to prepare the optimal solution for Cargill Lai’an Anhui. The proposed system comprises a ‘red water area’ with the appropriate screening systems, from here the water flows to a high efficient physical/chemical pre-treatment. Further treatment is done by a biological treatment with a clarifier system (BioClar®). As final step the water is disinfected by means of chemicals. After treatment by the AQUA I.W. installation the water is suitable for discharge to the sewer system. Sludge coming from the waste water installation is dewatered by a filter belt press. Notable for the system is the possibility for capacity increase in different phases. Cargill Lai’an increases the slaughtering numbers over a period of two years. In each stage the system will achieve the discharge requirements. Screening of the raw waste water is needed to protect the installation from large solids which can demolish equipment. The red water area is located next to the production area for quick removal of these solids. Waste water from the factory is pumped to the red water area. This area functions standalone and comprises three internal fed rotary screens. These screen have a large selfcleaning ability and are optimal suitable for waste water from poultry processing. After screening the water is pumped towards the further treatment which is located 350 meter from the red water area. Combined physical / chemical pre-treatment The high efficient physical/chemical pre-treatment removes sediment, suspended and emulsified pollution from the waste water. The physical/chemical pre-treatment comprises an equalisation basin, flocculator and Dafinci® Dissolved Air Flotation. In the equalisation basin (installed underground) peaks in flow, pollution and pH are leveled to achieve a more constant water composition towards the flocculator. In the flocculator chemicals are dosed to concentrate the emulsified and suspended pollutants in a flock like agglomerate, which can be separated from the water by flotation. The DAF unit creates micro-air-bubbles that become attached to these flocks, increasing the buoyancy of these particles and let them float on the surface. There they will be removed by a scraper. Biological treatment Sludge separation BioClar® The waste water will be further treated in a biological treatment with sludge water separation by means of a clarifier. The water will flow into the selector. Optimal mixing between waste water and RAS (Return Activated Sludge) limits the growth of filamentous bacteria and stimulates growth of flock bacteria which are most suitable for sludge separation systems. After the selector, the wastewater will flow into the aeration basin that is filled with an activated sludge-water mixture. Activated sludge consists of flocs of bacteria. In the presence of oxygen, the bacteria will decompose the biodegradable constituents in the wastewater. For this oxygen supply maintenance free bottom aeration is installed. The activated sludge must be separated from the purified water. In the AQUA I.W. BioClar® system, sedimentation is applied to separate the activated sludge from the water. Activated sludge is slightly heavier than water and will therefor accumulate on the bottom of the clarifier. Here a scraper will convey it to the center where it will be removed. The clarified water will flow slowly towards the outer circumference of the clarifier, where it will leave and flow towards final step. In this step it will be disinfected before it will be discharged to the sewer. AQUA I.W. is specialized in the industrial treatment of process waste water and sludge. Owing to its strong ties with the Stork group, active in such fields as food production and textile refinement, AQUA has extensive and advanced knowledge of industrial production processes. AQUA can therefor provide its client’s with tailored solutions for all phases of a production process, in the form of sub-trajectories or as integral end-of-pipe project. The following objectives are pivotal for all processes, from process water preparation trough to purposeful treatment of waste water and collecting and processing separated sludge: • Reduction of water consumption • Minimization of initial and operational costs • Less energy consumption and work • Purposeful implementation of systems and components