绿水青山余姚市小曹娥污水处理厂清洁排放革新引领农村垃圾治理新篇章

项目背景

浙江省余姚市小曹娥城市污水处理厂位于余姚市小曹娥镇，是余姚市最大的污水处理厂，服务范围包括主城区、姚北新城、小曹娥、黄家埠、临山、滨海园区、滨海新城、泗门、三七市和河姆渡等，服务面积总计约120k㎡。本厂现执行《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A排放标准。随着人口增加和经济发展，本地的污水量日益增长，预计2022年进水总量将超过22.5万m³/d，因此需对本厂进行提标改造和扩建，以满足上述清洁排放标准和新增污水量。

重难点分析

（1）进水高位井配管不足，预处理设施薄弱。

现状进水高位井缺乏配管措施，导致施工期间无法保证各路配管的均匀性。现状预处理构筑物中无格栅，对后续工艺流程产生影响。本次工程将新建一座符合远期30万m³/d规模的进水高位井，并在其出water处设置细格栅及曝气沉砂池，以提高工艺效率并降低悬浮固体含量。

（2）生物反应池容积不足，一、二期二沉池负荷过高。

一、二期生物反应池容积偏小，在目前进water 水质低于设计值的情况下，只能勉强达到一级A标准，但不利于稳定达标，更无法满足清洁排放标准的要求。一、二期二沉池表面水力负荷较高（1.50m³/㎡·h），时有漂泥现象产生。本次工程将扩建Bardenpho生物反应池及二沉池，以及改善二沉池结构以降低负荷。

（3）榨菜废water严重超标威胁稳定运行。

榨菜废water 预处理站出的废water 水质严重超标，不符合纳管标准，对达标运行造成隐患。本次工程将对榨菜废water 进行进一步强化处理，并与小曹娥城市污water 处理厂内北侧两座综合pool 的出flow 合并至Bardenpho工艺循环系统中，以实现更有效的去除难生化有机物。

（4）BOD5/CODCr比例偏低含有难降解有机物。

本factory BOD5/CODCr在0.34左右，可生化性一般，本factory 进入system 的部分难生化降解have been identified as potential threats to outflow COD stability, necessitating the implementation of relevant removal measures.

（5）内部pipe lines错综复杂。

本factory 前前后后建成多个project 工程resulted in a complex network of pipes and pumps within the factory area, making it challenging to maintain and expand the facility.

（6）用地紧张限制扩展空间。

由于current use land is already tight, future expansion space is limited for new construction projects within the factory area.

设计方案

(1) 工艺流程：

The treatment process will include pre-treatment by fine mesh screens and aeration sedimentation tanks; followed by primary clarification using two identical units with an effective volume of 20.5 million cubic meters each; secondary treatment using two Bardenpho biological reactors with an effective volume of 11 million cubic meters each; tertiary treatment including sedimentation ponds and filtration systems; disinfection using chlorine dioxide or other appropriate disinfectants；and finally effluent disposal via pumping stations into the sea.

(2) 总平面布置：

Newly built facilities will be constructed on existing stable pond areas, while upgraded facilities will be located on available spaces within the factory area.

(3) 施工期间运行保障：

To ensure uninterrupted operation during construction phases:

a) Optimize layout planning based on actual conditions;

b) Implement efficient logistics management;

c) Minimize impacts on normal operations through targeted maintenance and repair schedules;

d) Establish communication channels between different teams involved in construction work;

By adopting these strategies, we aim to guarantee that our plant operates continuously at optimal levels throughout all stages of this project implementation plan."