CN102259981B - A Sequencing Batch Biological Phosphorus and Nitrogen Removal Process - Google Patents

Abstract

A sequencing batch biological phosphorus and nitrogen removal process is suitable for the sequencing batch biological phosphorus and nitrogen removal of low-carbon source sewage treatment. Anaerobic, anoxic and aerobic biological treatment is carried out by using non-aeration tanks and aeration tanks. While aerating in the aeration tanks, a batch of sewage enters the non-aeration tanks and never aerates the tanks. When all the batches of sewage enter the non-aeration tank, stop the aeration in the aeration tank, and mix the mud-water mixture in the aeration tank with the mud-water mixture in the non-aeration tank , and then stop the mixing, and carry out the aeration in the aeration tank again, and at the same time, the mud-water mixture in the aeration tank is not used for mud-water separation; there is no secondary settling tank, no sludge backflow and internal backflow, which greatly saves engineering investment and operation cost, saving aeration, less carbon source required, low construction and operation costs, and small footprint, which better solves the difficulty in achieving efficient phosphorus removal due to low carbon source and imbalance of carbon, nitrogen, and phosphorus ratios Treatment of denitrified wastewater.

Description

A Sequencing Batch Biological Phosphorus and Nitrogen Removal Process

technical field

The invention relates to the technical field of sewage biological treatment, in particular to a sequence-batch biological phosphorus and nitrogen removal process suitable for low-carbon source sewage treatment.

Background technique

In recent years, the problems of water environment pollution and water eutrophication have become increasingly serious. Nitrogen and phosphorus are the main factors causing water eutrophication. With the improvement of public environmental awareness and stricter and stricter restrictions on nitrogen and phosphorus discharge at home and abroad, the construction land is becoming more and more scarce. Research and development of small-area, economical and efficient sewage treatment technologies for nitrogen and phosphorus removal , especially wastewater biological phosphorus and nitrogen removal technology has been a hot spot in the field of water pollution control engineering.

Contents of the invention

Technical problem: The purpose of this invention is to overcome the deficiencies in the prior art and provide a sequential batch biological phosphorus and nitrogen removal process with low energy consumption, small footprint and low operating cost.

Technical solution: The sequence batch biological phosphorus and nitrogen removal process of the present invention includes the use of non-aeration tanks and aeration tanks for anaerobic, anoxic and aerobic biological treatment, and also includes the following steps:

a. While aerating in the aeration tank, pass a batch of sewage into the non-aeration tank, and discharge the supernatant from the non-aeration tank;

b. When a batch of sewage all enters the non-aeration tank, stop the aeration in the aeration tank, and mix the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank;

c. Stop the mixing of the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank, carry out aeration again in the aeration tank, and at the same time separate the mud-water mixture from the mud-water mixture in the non-aeration tank;

d. Repeat steps a, b, and c to complete the next batch of sewage treatment.

The time for mixing the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank is 0.01 to 10 hours; the time for separating the mud-water mixture in the non-aeration tank is 0 ~6 hours; the aeration tank and the non-aeration tank are built together or separately.

Beneficial effects: the present invention combines the advantages of wastewater biological treatment methods and sequencing batch bioreactors to make full use of limited carbon sources, improve the utilization rate of carbon sources in wastewater treatment, and effectively solve the problem of insufficient carbon sources in wastewater biological phosphorus removal The problem. Through the intermittent water inflow and outflow of the non-aeration tank, the intermittent aeration of the aeration tank, and the mixing of the mud-water mixture in the two tanks, the anaerobic state, anoxic state, and mud-water separation successively appear in the non-aeration tank. The aerobic state, anoxic state, and aerobic state successively appeared. Sewage directly enters the non-aerated tank in anaerobic state, and the limited carbon source is given priority to the phosphorus accumulating bacteria, which is beneficial to the phosphorus removal of the system; the mud-water mixture circulates between the non-aerated tank and the aerated tank, and both tanks are in The anoxic state is conducive to the formation of denitrification and phosphorus removal under anoxic conditions. The two independent processes of denitrification and phosphorus absorption are combined into one, and one carbon is used for two purposes; the muddy water mixture in the aeration tank is not used for muddy water Separation, in the mud-water separation process, continue to complete the denitrification reaction, reduce the nitrite nitrogen and nitrate nitrogen in the return sludge and effluent water; Precipitation is placed, the sedimentation performance is good, and the effluent water quality is excellent. The present invention does not need a secondary settling tank, no sludge backflow and internal backflow, and sludge backflow and internal backflow devices are omitted. From the perspective of civil engineering quantities and equipment costs, it greatly saves engineering investment and operating costs. . It has the advantages of saving aeration, less carbon source required, low construction and operation costs, and small floor space. It solves the problem of low carbon source and imbalance of carbon, nitrogen, and phosphorus ratios, which make it difficult to achieve efficient phosphorus and nitrogen removal. sewage treatment problems.

Detailed ways

Below the embodiment of the present invention is further described:

The sequence batch type biological phosphorus and nitrogen removal process of the present invention utilizes the non-aeration tank and the aeration tank to carry out anaerobic, anoxic and aerobic biological treatment, and the aeration tank and the non-aeration tank are built jointly or separately. While aerating in the aeration tank, pass a batch of sewage into the non-aeration tank in anaerobic state, and discharge the supernatant from the non-aeration tank; when all the batches of sewage enter the non-aeration tank In the aeration tank, stop the aeration in the aeration tank, mix the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank, so that both the aeration tank and the non-aeration tank are in the absence of Oxygen state, the mixing time of the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank is determined according to the requirements of the sewage water quality and effluent water quality, generally 0.01 to 10 hours; after that, stop the mud-water mixture in the aeration tank Mix with the mud-water mixture in the non-aeration tank, aerate again in the aeration tank, and at the same time, separate the mud-water mixture in the non-aeration tank. The time of mud-water separation is 0 to 6 hours, and a batch is completed. Repeat the above process to complete the next batch of sewage treatment, and discharge the remaining sludge regularly. In order to increase the concentration of microorganisms in the sequence batch biological phosphorus and nitrogen removal process and achieve better phosphorus and nitrogen removal effects, fillers that provide attachment media for biofilm growth can be added to the non-aerated tanks and aerated tanks.

Claims (1)

1. A sequence batch type biological dephosphorization and denitrification process, comprising utilizing non-aeration tank and aeration tank to carry out anaerobic, anoxic and aerobic biological treatment, is characterized in that comprising the steps: a. While aerating in the aeration tank, pass a batch of sewage into the non-aeration tank, and discharge the supernatant from the non-aeration tank; b. When a batch of sewage all enters the non-aeration tank, stop the aeration in the aeration tank, and mix the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank; c. Stop the mixing of the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank, carry out aeration again in the aeration tank, and at the same time separate the mud-water mixture from the mud-water mixture in the non-aeration tank; d. Repeat steps a, b, and c to complete the next batch of sewage treatment. 2. A kind of sequential batch type biological dephosphorization and denitrification process according to claim 1, characterized in that: the time for mixing the mud-water mixture in the aeration tank and the mud-water mixture in the non-aeration tank 0.01 to 10 hours. 3. A sequential batch type biological phosphorus and nitrogen removal process according to claim 1, characterized in that: the time for the mud-water mixture in the simultaneous non-aeration tank to be separated from mud-water is 0-6 hours.