1.3 Features of the work
1.3.1 The work is to be put to bid in the form of general contraction of equipment supply, installation and commissioning. It therefore has stringent requirement for the bidder. The constructor is responsible for providing equipment as well as the supply, installation and trial operation of the individual equipment according to the design requirement. He is also responsible for ensuring the outlet water of the plan reaches the state level I standard. If the constructor fails to reach the promised level of performance, he shall make necessary improvement of the equipment or replace it either in the testing period or the 20-month supervised operation.
1.3.2 Stringent requirements for installation
The requirement is fairly stringent for the technical level of installation. A great number of domestically or internationally advanced equipment and instrumentation will be used and the control of installation accuracy is of vital importance to the commissioning operation. The management of the whole treatment plant will be computerized after installation and commissioning.
1.3.3 High degree of automation
The work utilizes the PLC integration and disintegration combination control to measure and control the level/interface, temperature, pressure, dissolved oxygen, concentration of sludge, alkalinity and acidity, flow rate, opening of control valves, concentration of poisonous gasses, voltage, current, power, etc. All process parameters will be displayed on CRT projector screens.
1.3.4 Many cross-operations
Construction of provided holes for underground pipeline networks, valve shafts and operating equipment must be done in conjunction with the public utility works. Therefore a large amount of cross-operations will be involved.
1.3.5 Many open-air operations
Since open-air operation will be greatly affected by weather. Operation should be carried out as quickly as possible if the weather condition permits and technical measures should be taken during performing construction in rainy weather.
1.1.2 编制原则
依靠科技、加强管理、优化网络、均衡施工。
1.1.3 编制指导思想
严格按照IS09001标准要求，与国际惯例接轨，参照了菲迪克条款对承建商的有关要求，力争使该施工组织设计能全面、系统、科学、有效地指导该工程的安装及调试直至试运行符合施工验收规范和业主要求，从而实现设计意图。
1.1.4 编制目的
确保某污水处理厂安装工程的施工进度、施工质量、施工安全、确保文明施工、环境保护、员工健康、实现业主愿望，确保用户满意。
1.2 工程概况
重庆市某污水处理厂二期工程是重庆市利用日本政府贷款建设的主城排水工程之一。本工程的实施将为重庆主城区的可持续发展创造安全的环境。
二期工程是在原一期工程的基础上，完成一级处理、二级生物处理、消毒及污泥处理工程，使污水处理达到国家一级排放标准后，排入长江。
重庆市某污水处理厂用来处理雨污合流的城市污水，二期工程设计旱季处理污水量为60万m3/d，雨季处理污水量为135万m3/d，二级生物处理过程。远期污水厂规模为处理污水量80万m3/d，雨季处理污水量165万m3/d，二级生物处理过程。
重庆市某污水处理厂二期工程由上海某设计研究院设计。
工期要求：合同生效后360天内（包括安装和完成预调试）。
1.3 工程特点
1.3.1该工程采取设备供货、安装及调试总承包方式招商，对投标人要求严，承建商负责按设计要求提供设备及各个单项设备的性能保证的供货，安装及试运行。同时负责污水处理厂出水水质达到国家一级排放标准，如果达不到所保证的性能，无论是在测试期还是在20个月的运行监理期间，承建商应对设备作必要的改进或更换以达到所保证的性能。
1.3.2安装技术要求高
工艺设备安装技术要求高。该工程将大量采用国内外先进设备及仪器仪表，安装精度的控制对调试致关重要，整个污水处理厂安装调试合格后将实现计算机管理。
1.3.3自动化程度高
本工程采用PLC集中与分散相接合的控制方式。对液位/界面、温度、压力、溶解氧、污泥浓度、酸碱度、流量、调节阀开启度、有害气体浓度、电压、电流、功率等实施测量控制，工艺设置CRT投影仪银幕进行显示。
1.3.4交叉作业多
地下管网、阀井、工艺设备预留孔与土建必须配合进行，存在大量交叉作业。
1.3.5露天作业多
露天作业受气候影响大，在施工中条件成熟的要抓紧时间实施，雨天作业要有相应的技术措施。
1.4工艺简介
采用A/A/O处理工艺
重庆市某污水处理厂二期处理程度为一级处理、二级生物处理、消毒及污泥处理，执行中华人民共和国国家标准GB8978—1996《污水综合排放标准》中的一级标准，即：BOD5≤20mg/1，SS≤20mg/1，CODcr≤60mg/1，NH3-N≤15mg/1，TP≤0.5mg/1。
该污水处理厂采用A/A/O生化处理工艺。它是在A/O工艺基础上增加了一个缺氧区，具有同步脱氮除磷的功能。
A/A/O工艺处理污水首先进入厌氧区，兼性厌氧发酵细菌将污水中可生物降解的有机物转化为VFA（挥发性脂肪酸类）这类低分子发酵中间产物。而聚磷菌可将其体内存储的聚磷酸盐分解，所释放的能量可供好氧的聚磷菌在厌氧环境下维持生存，另一部分能量还可供聚磷菌主动吸收环境中的VFA类低分子有机物，并以PHB（聚羟β丁酸）的形式在其体内储存起来。随后污水进入缺氧区，反硝化菌就利用好氧区回流混合液带来的硝酸盐，以及污水中可生物降解有机物作碳源进行反硝化，达到同时降低BOD5与脱氮的目的。接着污水进入曝气的好氧区，聚磷菌在吸收、利用污水中残剩的可生物降解有机物的同时，主要是通过分解体内储存的PHB释放能量来维持其生长繁殖。同时过量的摄取周围环境中的溶解磷，并以聚磷的形式在体内储积起来，使出水中溶解磷浓度达到最低。而有机物经厌氧区、缺氧区分别被聚磷和反硝化细菌利用后，到达好氧区时浓度已相当低，这有利于自养型硝化菌的生长繁殖，并通过硝化作用将氨氮转化为硝酸盐。非除磷的好氧性异养菌虽然也能存在，但他在厌氧区中受到严重的压抑，在好氧区又得不到充足的营养，因此在与其他生理类群的微生物竞争中处于相对劣势。排放的剩余污泥中，由于含有大量能超量储积聚磷的聚磷菌，污泥含磷量可以达到6%（干重）以上。从以上分析可以看出A/A/O工艺具有同步脱氮除磷的功能。
A/A/O工艺的优点是厌氧、缺氧、好氧交替运行，可以达到同时去除有机物、脱氮、除磷的目的，而且这种运行状况丝状菌不宜生长繁殖，基本不存在污泥膨胀问题。A/A/O工艺流程简单，总水力停留时间少于其他同类工艺，并且不需外加碳源，缺氧、缺氧段只进行缓速搅拌，运行费用低。
雨、污水经过上述处理合格，符合国家排放标准的污水直接排入长江。
1.1.2 Principle of preparation
Rely on science and technology, strengthen management, optimize network and perform construction operation in a balanced way.
1.1.3 Guideline of preparation
The document has been prepared in strict accordance with the requirement of ISO9001 and in conformity with the international practice. The requirements for contractors in FIDIC terms have been referred to enable the construction organization design to guide the installation and commissioning operations of the work in a complete, systematic, scientific and efficient way until its trial operation meets the construction work acceptance specification and the owner’s requirements and realize the design intent.
1.1.4 Purpose of preparation
Ensure the work progress of the project, quality of construction operation, safety, orderliness in operation, environment protection, workers’ physical health to fulfill the owner’s will and make the user satisfied.
1.2 Project information
The second-phase work of Chongqing Jiguanshi Sewage Treatment Plant is one of the drainage works to be built in the metropolitan area using the loan provided by the Japanese government. The building of the work will help create a safe environment for the sustainable development of the metropolitan area of Chongqing.
The second-phase work is based on the first-phase work by completing the works for primary-level treatment and secondary biological treatment, sterilization and sludge disposal so that the treated sewage will reach the state-designated discharge level I before being let into the Yangtze River.
Chongqing Jiguanshi Sewage Treatment Plant is used to purify urban sewage made up of rainwater and wastewater. The second-phase work is designed with an output capacity of 600,000 m3/d in dry seasons and 1,350,000 m3/d in rainy seasons. For the second-level biological treatment process, the far-future output capacity of the plant is 800,000 m3/d and the rainy season capacity of the plant is 1,650,000 m3/d.
The second-phase work of the sewage treatment plant is designed by Shanghai Public utility works Design and Research Institute.
Required construction period: within 360 days after the contact takes effect (including installation and preliminary commissioning).
1.3.3 High degree of automation
The work utilizes the PLC integration and disintegration combination control to measure and control the level/interface, temperature, pressure, dissolved oxygen, concentration of sludge, alkalinity and acidity, flow rate, opening of control valves, concentration of poisonous gasses, voltage, current, power, etc. All process parameters will be displayed on CRT projector screens.
1.3.4 Many cross-operations
Construction of provided holes for underground pipeline networks, valve shafts and operating equipment must be done in conjunction with the public utility works. Therefore a large amount of cross-operations will be involved.
1.3.5 Many open-air operations
Since open-air operation will be greatly affected by weather. Operation should be carried out as quickly as possible if the weather condition permits and technical measures should be taken during performing construction in rainy weather.
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