Phosphate eliminating flocculant and its production process

Abstract

The phosphate eliminating flocculent and its production process belongs to the field of phosphate eliminating in sewage treatment. The phosphate eliminating flocculent has ferrous sulfate, which is the side product of titanium white powder production, as the main material, and has the features of simple component, waste utilization, low cost, etc. The production process is completed at normal temperature and is simple, safe and without harmful gas produced. Adding the phosphate eliminating flocculent into sewage can eliminating soluble phosphate effectively from sewage, eliminate phosphides in other forms in flocculation and lower SS, COD, BOD, etc. The present invention may be used widely in sewage treatment, especially high phosphate sewage treatment.

Description

1. Technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to the phosphorus removal technology of sewage treatment. 2. Background technology [0002] In the mid-1970s and 1980s, the urban sewage treatment process was dominated by the traditional activated sludge method, which mainly aimed at removing chemical oxygen demand (COD), and did not have high requirements for nitrogen and phosphorus indicators in the treated effluent. In recent years, urban people generally use washing machines to wash clothes, etc., and use a large amount of phosphorus-containing substances such as washing powder, which not only increases the amount of sewage in cities and towns, but also increases the phosphorus content in sewage. With the development of society and the continuous improvement of people's living standards, the requirements for urban sewage treatment will become higher and higher, and the indicators for phosphorus and nitrogen removal ...

AI Technical Summary

Problems solved by technology

For example, the sewage treatment methods disclosed in Chinese patents CN1410366 and CN2481707 have good nitrogen removal effect, but poor phosphorus removal stability. When phosphorus (TP) in the influent is > 4mg / l, the treated water is difficult to meet the national first-level discharge standard. The phosphorus removal effect on high-phosphorus sewage is even worse

Another example is the sewage treatment method disclosed in Chinese patent CN1354143, which utilizes calcium ions (Ca 2+ ) to remove phosphorus, but this method needs to adjust the pH value of water to 9-10 to have a significant effect by using calcium ions to remove phosphorus. Obviously, this method cannot be used for urban sewage treatment with a large amount of sewage and high phosphorus content