化工废水处理方案

CONTENT 1.0 BACKGROUND OF THE PROPOSAL ................................................................................................... 1  2.0   COMPANY PROFILE ................................................................................................................................ 1  3.0  PERFORMANCE CRITERIA ................................................................................................................... 1  3.1  General Requirement ............................................................................................................................. 2  3.2  Raw Wastewater Quality ....................................................................................................................... 2  3.3  Effluent Requirement ............................................................................................................................. 2  4.0    BASIC DESIGN OF THE PROPOSED WWTP ...................................................................................... 2  4.1  Process Diagram ..................................................................................................................................... 2  4.2  Flow Variation ........................................................................................................................................ 3  5.0    PROCESS DESCRIPTION ........................................................................................................................ 3  5.1  Pre-treatment for Producting Wastewater .......................................................................................... 3  5.1.1  Equalization Tank ........................................................................................................................... 3  5.1.2  Reactor ............................................................................................................................................ 4  5.1.3  Settling Tank ................................................................................................................................... 4  5.1.4  DAF Unit ......................................................................................................................................... 4  5.1.5  Triple--effect Evaporation .............................................................................................................. 4  5.2  Collection for Sanitary & Industry Wastewater .................................................................................. 5  5.2.1  Equalization Tank ........................................................................................................................... 5  5.2.2  pH Adjustment Tank ....................................................................................................................... 5  5.2.3  SBR Unit .......................................................................................................................................... 6  5.3  Sludge Storage & Dewatering ............................................................................................................... 6  5.3.1  Sludge Tank..................................................................................................................................... 7  5.3.2  Sludge Dewatering .......................................................................................................................... 7  5.4   Chemical Dosing Unit ............................................................................................................................ 7  5.4.1  Acid Storage and Dosing ................................................................................................................ 7  5.4.2  Caustic Storage and Dosing ............................................................................................................ 7  5.4.3  Phosphoric Acid Storage and Dosing ............................................................................................. 7  5.4.4  Ferric Salt Storage and Dosing ...................................................................................................... 8  5.4.5  Lime Preparing and Dosing ............................................................................................................ 8  5.4.6  PAC Preparing and Dosing ............................................................................................................ 8  5.4.7  PAM Preparing and Dosing ........................................................................................................... 8  5.5 Electrical Control with PLC ................................................................................................................... 8  5.6 Piping, Fitting and Valves ....................................................................................................................... 9  5.7 Footprint .................................................................................................................................................. 9  5.8 Tie-in List ................................................................................................................................................. 9  5.9 Wastewater Collection Suggestion ......................................................................................................... 9  5.10     Civil and Construction Sizing ............................................................................................................... 10  6.0  ENGINEERING & DOCUMENTATION ............................................................................................... 10  7.0 PROCESS AND FLOW DIAGRAM ........................................................................................................ 12  8.0 LAYOUT DRAWING ................................................................................................................................ 12  9.0  MAJOR EQUIPMENT LIST WITH ITEMIZED PRICE ..................................................................... 12  10.0   MAJOR EQUIPMENT SPECIFICATION ............................................................................................. 12  11.0  PROJECT SCHEDULE ............................................................................................................................ 12  12.0  SCOPE OF THE SUPPLY ........................................................................................................................ 12  13.0  EQUIPMENT & TURNKEY SCOPE OF SUPPLY CHECKLIST ...................................................... 12  14.0  PRICE ......................................................................................................................................................... 13  15.0  PAYMENT TERM ..................................................................................................................................... 13  16.0 VALIDITY .................................................................................................................................................. 13  17.0  WARRANTY STATEMENT .................................................................................................................... 14  PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 1 of13 1.0 BACKGROUND OF THE PROPOSAL Merk is planning to build a new pharmaceutical factory in China. A Wastewater Treatment Plant will be required for the new project. The client is interested to receive tenders for the design, fabrication, construction, installation, testing, commissioning and supply of the whole wastewater treatment (WWTP) package with necessary ancillary facility. PACT Environment Technology Co., LTD, a company incorporated in the People’s Republic of China, is specialized in industrial water/wastewater treatment and has over hundred (100) water/wastewater projects records in China and overseas. With the client’s understanding and qualification as capable and experienced in this type of work, PACT wishes to have the opportunity to offer the required wastewater treatment plant with all necessary services. 2.0 COMPANY PROFILE PACT is an engineering manufacturer and contractor specialized in industrial water and wastewater treatment, established as a WOFE company in China in February 1998. PACT's engineering office locates at Shanghai; in where we have over fifty engineers specialized in water/wastewater treatment. PACT has manufacturing facilities locates at both Shanghai and Wuxi, China. We have good experiences and records of providing high quality water/wastewater treatment plants to Pharmaceutical industries. These clients are typical steel manufacturers or aluminum coil/sheet manufacturers. Project reference includes: - SmithKline Beecham/Hooker Cockram, Tianjin, Industrial Wastewater/ Domestic sewage treatment plant/ Water treatment plant - Johnson & Johnson, Shanghai, Industrial wastewater treatment - Lederle-Wyeth/Gammon, Suzhou, Industrial wastewater treatment - Suzhou Capsugel, Suzhou, Industrial water treatment plant - Novartis Pharma Co., Ltd. / Foster Wheeler, Changshu, Industrial wastewater treatment - Sanofi/ Technip, Shenzhen, Water treatment and heat recovery plant - MSD, Hangzhou, Industrial wastewater treatment plant PACT's advantage is in combining technical and project management know-how of the West with local engineering and products sourcing. The combination results in competitively-priced high quality products that comply with international M&E engineering standards. 3.0 PERFORMANCE CRITERIA PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 2 of13 3.1 General Requirement There’re total three streams of wastewater to be treated, sanitary WW, industry WW and product WW. The flow rate of them is listed below: Sanitary WW Industry WW Product WW Average hour water drainage demand (m3/hr) 1.88 6 - Max. hour water drainage demand (m3/hr) 2.13 47 - Max. day water drainage demand (m3/d) 9.8 86.2 96.8 3.2 Raw Wastewater Quality The specified characteristics of these streams please refer to the inquiry documents. 3.3 Effluent Requirement The effluent should meet the following standards: - CJ343-2010 Wastewater Quality Standards for Discharge to Municipal Sewers, Class B - GB8978-1996 Integrated Wastewater Discharge Standard, Class III 4.0 BASIC DESIGN OF THE PROPOSED WWTP 4.1 Process Diagram Based on the understanding of the key factors shown above, as well as our experience on the similar WWTP supplied before, we will supply a WWTP system to meet the client’s requirement. Below is a brief description of the basic design of the proposed system: PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 3 of13 Wastewater Solid Waste Equalization Tank 1 Producing WW Chemical Reactor  DAF Unit  Evaporation Unit Chemical Sludge Tank Equalization Tank 2 Sanitary WW & Industry WW pH Adjustment Tank 2  SBR Unit Biological Sludge Tank Sludge Dewatering Discharge Coagulation/Flocculation Settling Tank 4.2 Flow Variation Due to the unsteady inlet flow rate, a variation coefficient as 1.1~1.2 is considered in proposed WWTP design. 5.0 PROCESS DESCRIPTION 5.1 Pre-treatment for Producting Wastewater 5.1.1 Equalization Tank PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 4 of13 The equalization tank is set for collecting mother liquor and rinse water. It is designed as concrete tank with cover. A level transmitter is required for the continuous monitoring of the liquid level. To keep homogeneous water quality and prevent solid depositing on the bottom of tank, measures of mixing by agitator are necessary. Pumps are designed to lift wastewater from equalization tank to following reactor. A magnetic flow meter is designed at outlet piping of equalization tanks for the monitoring and the flow. 5.1.2 Reactor With our experiences of treating this kind of wastewater, adding lime, phosphoric acid and ferric salt can not only adjust pH to a proper environment allowing ion precipitation, but also improve the precipitation efficiency by introducing Ca2+, Fe3+, OH- and PO43- that form the precipitate. We design a reaction tank with tank mixer for this process. The produced turbid liquid will flow to next process. 5.1.3 Settling Tank Effluent from the reactor will be alkaline as a result of lime’s addition. To obtain better sedimentation of the precipitate, acid and caustic, proper coagulant and polyelectrolyte shall be injected in the coagulation & flocculation tanks. The primary settling will remove the precipitation by gravity. SS, phosphorous and heavy metals will almost generate as chemical sludge and be removed from settling tank. 5.1.4 DAF Unit Dissolved Air Flotation (DAF) is the most widely used technique for water/suspended solids separation. It is designed here as a second stage SS removal unit to guarantee the effluent. The PACT DAF process has higher separation efficiency per unit cost of wastewater treated. The process is practically maintenance free. 5.1.5 Triple--effect Evaporation PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 5 of13 The evaporation system will adopt triple-effect forward current process. The falling film vaporizer, which has fewer temperature difference loss as well as higher velocity of heat transfer, will be applied at the first and second step for its non-crystalline character. However, the forced recirculation vaporizer, which has higher ability of salt-out- resistance and scar-over-resistance, will be applied at the third step where crystal will grows. In the first and second heating chambers, inlet liquor flows into the distributor, which evenly distributes the fluid to each heating tube. The fluid flows down alone the inner tube as the form of film, and then is vaporized by the heat from the steam. Two (2) recycle pumps are designed to pump the fluid back to the heating chamber from the separation chamber, so as to keep the fluid film fully coating the heating tube. After primary liquor-vapor separation in the first vaporizer, the heated fluid will go into the secondary evaporator. The secondary vapor will service as the heat source of the secondary heating chamber, as well as the liquor flow down to the secondary separation chamber. The same process will occur in the third evaporator. The concentration of salt in the third separation chamber is so high, that even the crystalline, which is harm to the heat exchanger, will happen. To avoid this, an axis pump with large flow and lower head is designed to transfer the fluid through the third heating chamber with a higher velocity. The third vapor from the third separation chamber will go to the condenser to be cooled down under vacuum condition. And the condensate will be stored in the condensate tank. The concentrated liquor from the bottom of the third separation chamber is pumped to the settling tank to separate the salt solid from the liquid. The decanter will be pumped back to the third separation chamber and the solid be discharged as solid waste. 5.2 Collection for Sanitary & Industry Wastewater 5.2.1 Equalization Tank The equalization tank is set for collecting sanitary wastewater, industry wastewater and effluent from producting wastewater pretreatment unit. It is designed as concrete tank with cover. A level transmitter is required for the continuous monitoring of the liquid level. A bar screen is designed upstream for large particle removal. 5.2.2 pH Adjustment Tank Concerning of the uncertain pH of mixing wastewater, pH adjustment is designed in this tank for protecting following biological treatment. PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 6 of13 Acid/caustic dosing will be controlled by the signal from pH meter, which monitoring the wastewater in this tank continuously. 5.2.3 SBR Unit Sequencing Batch Reactor (SBR) shall be the proper design for your kind of wastewater.  Process of SBR The SBR process utilized a fill-and-draw reactor with complete mixing during the batch reaction step (after filling) and where the subsequent steps of aeration and clarification occur in the same tank. Generally, SBR are carried out in sequence steps as: 1) fill, 2) react (aeration), 3) settle (sedimentation/clarification), 4) draw (decant), and 5) idle.  Advantages of SBR - Low-footprint, fewer constructions and equipments - Strong capacity of anti-loading shock - Equalization function on influent - Flexibility to adapt process according to influent quality - Easy maintenance The SBR tank will be designed as a concrete tank. One (1) set of DO meter will be equipped for dissolved oxygen control which is important to system operation. Sludge pump will be applied to transfer the excess sludge to the sludge storage tank. 5.3 Sludge Storage & Dewatering PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 7 of13 5.3.1 Sludge Tank The WWTP generate sludge continuously in 24 hours per day while the dewatering device is designed to be operational several hours per day. Sludge storage tanks provide the necessary operational flexibility of the system. Total two (2) sludge storage tanks are designed for collecting chemical and biological sludge separately. Mixers are designed to prevent solid depositing on the bottom. 5.3.2 Sludge Dewatering Progressive cavity pumps are designed to transfer the sludge to the filter press for sludge dewatering. High/low level switch will also be installed to activate an alarm. A polyelectrolyte dosing system is necessary to the sludge conditioning. A filter press designed to dewater the sludge from the sludge storage tank. The dewatered sludge will be collected by a trolley which can be cleaned regularly. 5.4 Chemical Dosing Unit 5.4.1 Acid Storage and Dosing One (1) acid solution tank is designed for the storage of acid. Two (2, duty/standby) chemical metering pump are designed to add the solution to the pH adjustment tanks when it is necessary. 5.4.2 Caustic Storage and Dosing One (1) caustic solution tank is designed for the storage of caustic. Two (2, duty/standby) chemical metering pump are designed to add the solution to the pH adjustment tanks when it is necessary. 5.4.3 Phosphoric Acid Storage and Dosing One (1) phosphoric acid solution tank is designed for the storage of phosphoric acid. Two (2, duty/standby) chemical metering pump are designed to add the solution to the reactor when it is necessary. PROPOSAL FOR WASTEWATER TREATMENT PLANT V2.0 Client: JACOBS Commercial in Confidence Page 8 of13 5.4.4 Ferric Salt Storage and Dosing One (1) ferric salt solution tank is designed for the storage of ferric salt. Two (2, duty/standby) chemical metering pump are designed to add the solution to the reactor when it