Combined processing technology for slightly polluted raw water

Abstract

The invention discloses a combined processing technology for slightly polluted raw water. The raw material water firstly enters into a first ozone contact tank for pre-ozonation, then enters into a flocculation sedimentation tank for sedimentation treatment, after sedimentation, the water enters into a secondary ozone contact tank for ozonation decomposition, then enters into a carbon sand filtering tank for filtering, the filtered water enters into a membrane processing system, the membrane-processed water enters into a clean water tank for dispatching and storing and are disinfected in the clean water tank by adding chlorine, and the water enters into a suction well and is conveyed to a water distribution network via a pump set in a clean water pump house. The combined processing technology of the invention has the advantages that: the finished water coming from the processed slightly polluted raw water can not only be guaranteed to reach the sanitary standard for drinking water, but also meet higher requirements in some indexes, and is eliminated in microbial overweight risk and effectively removed in humic acid and cryptosporidium and giardia. Additionally , compared with the prior art, the combined processing technology combined with advanced treatment process helps to saves land occupations of a sand filtering tank and a disinfection contact tank and enable water quality upgrading construction of an existing water factory with a compact field to be implemented.

Description

technical field [0001] The invention relates to a water treatment combined intensified process involved in water supply engineering, in particular to a combined treatment process for slightly polluted raw water. Background technique [0002] With the implementation of the "Urban Water Supply Quality Standards" issued by the Ministry of Construction and the implementation of the national "Drinking Water Hygienic Standards (GB5749-2006)", most of the conventional process water plants with polluted water sources in my country are facing water purification process upgrades task of transformation. [0003] With the successive implementation of new industry standards and national standards, the Yangtze River Delta and Pearl River Delta regions, where the economy is relatively developed and water sources are generally heavily polluted, have gradually implemented upgrading and transformation of water purification processes in recent years, among which Zhejiang Province started earlie...

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Problems solved by technology

[0004] Hangzhou Water Industry Group Co., Ltd. has carried out water purification process transformation for water plants in the main urban area of ​​Hangzhou since the end of the last century, in which pre-ozone and post-ozone biological activated carbon processes have been added to the conventional water treatment process. After completion and operation, the effluent water quality basically meets the requirements of the above-mentioned new standards. However, limited by the conditions of the construction site, the storage capacity of the clean water reservoir of the transformed water plant is very limited, and it is difficult to meet the operation and scheduling requirements of the water plant.

In addition, there is still a gap between the turbidity of the effluent and the effluent standard of modern water plants in Zhejiang Province

[0005] At present, the process of pre-ozone plus ozone activated carbon is generally used by water companies as the main choice for water plant upgrades, but the construction sites of most water plants are very tight. How to solve the contradiction between construction sites and water quality indicators has gradually become a constraint for all water plants. Major Challenges in Implementing Upgrading

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