Can biochemical sewage treatment reduce the salt content of wastewater?

Can biochemical sewage treatment reduce the salt content of wastewater? Biochemical method is to use bacteria and fungi to eat (decompose) organic matter in sewage.

So, like some ions, we need to use other methods.

How to treat bromine-containing wastewater in sewage treatment is a kind of heavy metal ion exceeding the standard. You can find a heavy metal collector and add it directly for treatment. Jessie Chemical replied, I hope I can help you!

What is the treatment method of slaughter wastewater in Sichuan sewage treatment? The high-concentration organic wastewater produced in the process of slaughter production is treated by grid, hoof net, pre-sedimentation in grit chamber, balancing in regulating tank, biochemical treatment in SBR reaction tank and sterilization in disinfection tank, and the effluent quality reaches the first-class discharge standard of national integrated wastewater discharge standard (GB 8978- 1996).

Meat food is a necessity of human life, and it is one of the main sources to meet human demand for nutrients such as protein and fat. Meat processing refers to the slaughter and deep processing of domestic animals such as pigs, cattle and sheep and poultry such as chickens and ducks to produce meat food and non-staple food needed by people's lives.

In the process of slaughtering and meat processing, a lot of water is consumed, and at the same time, wastewater containing blood stains, grease, wool, meat scraps, internal organs of livestock and poultry, undigested food and feces is excluded. This kind of wastewater also contains a lot of microorganisms harmful to human health. If the meat processing wastewater is discharged directly without treatment, it will cause serious pollution to the water environment and endanger the health of people and livestock. The pollutants contained in meat processing wastewater are mostly biodegradable organic substances. When they are discharged into the water, they will quickly consume dissolved oxygen in the water, leading to the death of fish and aquatic organisms due to lack of oxygen. Due to lack of oxygen, water will turn into anaerobic state, which will worsen the water quality, produce odor and affect health. At the same time, pathogenic microorganisms in wastewater will multiply in large numbers, endangering people's health. In order to protect the ecological environment and human health, it is necessary to treat the slaughter and processing wastewater and eliminate its pollution.

The wastewater from slaughtering and meat processing plants is mainly produced in the slaughtering process and preparation process. The wastewater mainly comes from the processes of washing the fence, washing and slaughtering before slaughter, bloodletting, depilation, disintegration, segmentation, cleaning the internal organs and intestines. In the process of oil extraction, deboning, cutting and non-staple food processing, some wastewater will also be discharged. In addition, there are cooling water in the freezer of meat processing plants, and domestic sewage discharged from workshop sanitary devices, laundry rooms, office buildings and welfare facilities.

Meat processing wastewater contains a lot of pollutants such as blood, grease, oil lumps, hair, meat scraps, internal organs, undigested food, feces and so on. The appearance is unpleasant blood red, with a disgusting fishy smell. In addition, meat processing wastewater also contains bacteria related to human health, such as fecal Escherichia coli, fecal streptococcus, salmonella, etc., but generally does not contain toxic substances.

The pollutants in meat processing wastewater are mainly soluble, colloidal and suspended organic substances, and their pollution indexes are mainly PH, COD, BOD, SS and so on. In addition, there are total nitrogen, organic nitrogen, nitrate nitrogen, total solids, total phosphorus, sulfate, sulfide and total alkalinity.

A meat processing factory in our city is mainly responsible for providing fresh and high-quality pork, beef, mutton and other meat to major vegetable markets in the city. Every day, 0/50 pigs, 0/5 cows and 0/5 sheep were slaughtered. The production process of slaughtering pigs, cattle and sheep is similar, including slaughtering, unhairing (cattle are skinned), eviscerating and so on. In these production processes and the cleaning process of slaughtering equipment and production sites, a large amount of organic wastewater will be produced. These wastes contain a lot of dirt such as blood clots, grease, pigskin, pig hair (wool), animal viscera, undigested food, feces and so on. It has an uncomfortable blood red color, fishy smell, and a lot of pollutants such as bacteria and Escherichia coli. If this kind of wastewater is directly discharged into human body water without treatment, it will bring great harm to water resources.

1. Waste water source

Slaughtering wastewater mainly comes from slaughter workshop, including ① wastewater generated by cleaning live animals before slaughter; (2) Waste water generated by slaughtering livestock; (3) Waste water generated during peeling, unhairing and cleaning of animal meat; (4) Waste water generated in the process of eviscerating and extracting edible oil; ⑤ Waste water generated when cleaning the workshop floor and slaughtering equipment; ⑥ The waste water produced during the washing of live animals is the most polluted in the slaughter process, and its blood clots should be collected and utilized as much as possible to increase income and reduce the subsequent waste water treatment load.

2. Water quantity and quality

Slaughtering wastewater is mainly discharged from the slaughter workshop, and the amount of wastewater directly depends on the type and quantity of slaughtered livestock, and the amount of wastewater varies greatly in one day, and the wastewater is mainly discharged between 5: 00 and 8: 00 in the morning. Relevant data clearly show that the water consumption for slaughtering a large and small animal in the Japanese Ministry of Health and Welfare is: 1.0m? 0.4~0.7m? The water consumption for slaughtering a big animal and a small animal in Russia is 0.8m? And 0.4-0.6m? ; However, the water consumption for slaughtering a large and small livestock in several slaughterhouses in China is 1.0- 1.5 m respectively. 0.4-0.7 m？ ; The average water consumption for slaughtering a large and small livestock in this meat processing plant is 1.0 m? Calculation, considering that with the further increase of urban population, the slaughter amount of livestock will also increase, so the total design amount of wastewater is 180 m? .

2.2 Waste water quality

The quality of slaughter wastewater belongs to high suspended solids and high organic matter wastewater, especially the wastewater discharged from slaughter and internal organs treatment. Slaughtering wastewater contains a lot of blood and protein, and the wastewater is bright red. The BOD5 (biochemical oxygen demand) value is very high, which is related to whether the blood recovers. Generally, it is 5000- 10000mg/L, up to 3000 mg/L, COD 5 (chemical oxygen demand) is generally between 13000-25000mg/L, and SS (suspended matter) is as high as 3000 mg/L. Visceral treatment process mainly contains gastrointestinal undigested substances and excreta, and its BO value can be as high as 65,438+03,000 mg/L, Cod 5 35 35,000 mg/L and ss as high as 65,438+00,000-65,438+05,000 mg/L. Therefore, before entering the subsequent treatment facilities, it is necessary to

The effluent quality index of wastewater treatment should meet the first-class discharge standard of National Integrated Wastewater Discharge Standard GB8978- 1996.

Quasi (new expansion), the effluent quality indicators are shown in Table 2.

3. Wastewater treatment process

It can be seen from the table 1 that the wastewater has good biodegradability, so biochemical treatment method is adopted, and its main treatment process is shown in Figure L. 。

After coarse dirt such as blood clots, skin, animal viscera, hair, etc. In the water body, it is preliminarily removed from the slaughter wastewater through grids and screens, and the wastewater directly enters the grit chamber, where undigested substances, excreta and suspended solids with high specific gravity are precipitated in the animals, and the slaughter wastewater which has been homogenized in the regulating tank is subjected to advanced biochemical treatment through the SBR reaction tank. After the wastewater in SBR reaction tank reaches the set liquid level, jet aeration is carried out. The dissolved oxygen of Ficus microcarpa in organic wastewater is greatly increased. Under the action of activated sewage, macromolecular organic pollutants in slaughter wastewater are degraded into small molecular organic substances, and finally decomposed into carbon dioxide, methyl sulfate and water. After the sludge is precipitated after aeration, the supernatant is discharged into the disinfection pool for disinfection, and the disinfected clean water is directly discharged into the water body.

The SBR reaction tank adopts 1 concrete tank with two shifts every day. When the sludge deposited at the bottom reaches a certain water level, it is pumped into the sludge pool by the sludge pump for concentration, and the concentrated sludge is pumped away by the sanitation truck regularly. SBR reaction oil is treated by biochemical control step by step, with five stages of water inflow, aeration reaction, static sedimentation, drainage and sludge discharge as an execution cycle, as shown in Figure 2, and an execution cycle is 7h[ even number, including water inflow]. Aeration reaction: 3.5h static precipitation: 1. 0h； Drainage:1.0h; Sludge discharge: 0.5h.SBR biochemical system is a plug-flow reactor with complete mixing characteristics and an ideal secondary sedimentation tank. In addition, SBR system has good sludge settling efficiency, low sludge proliferation and sludge output, and is especially suitable for organic wastewater with good biochemical efficiency and small water volume.

4. Main structure and equipment

(1) Grille and filter screen: the dimensions are both 1600mmx 1400mm, which are arranged in the intake canal, with a distance of 2000mm from front to back, and the effective filtering area is 1.6m m, and the separated blood clots, grease, pigskin and pig hair (wool).

(2) grit chamber: the size is 3600 mm×1200 mm×1500mm, and there are two sludge hoppers at the bottom. Sludge pump is used to pump sludge 1200mmx 1500mm regularly, and the model of sludge pump is 150 qw200.

(3) Regulating tank: the size is 6000mmx5000mmx2500mm, and the effective volume is 60m? At the same time, it can adjust the water quantity, balance the water quality and precipitate the suspended matter floating in the grit chamber.

(4)SBR reaction tank: the size is 10000mmx6000mmx3500mm, and the effective volume is 150m? Divided into two classes, there are two submersible self-priming aerators for aeration, model QBZ040 (oxygen (O2) 3.2-4.6kg/h).

(5) Disinfection pool: the size is 4000mmx3000mmx2000mm, and the effective volume is 20m? Disinfection time is 1.0h, and sodium hypochlorite solution (concentration is 7.5% or 6mg/L) is automatically added through dosing pump. The models of dosing pump are B- 1500 series and B-750 model.

(6) Sludge concentration tank: the effective volume is 25m? Φ Φ 2500 x 3500 is made of reinforced concrete because of its cone shape.

5. Analysis of execution results

Slaughtering wastewater is treated by grid, grid, grit chamber, regulating tank, SBR biochemical reaction tank and disinfection tank. The indicators of pollutants in wastewater all meet the national discharge standards. See Table 3 for the effluent quality indexes of the monitoring station of the Municipal Environmental Protection Bureau.

6. Economic benefit analysis

The execution cost of this slaughter wastewater treatment project is mainly composed of electricity, medicine, labor, maintenance and depreciation.

It's done.

(l) Electricity fee for the plant: When the plant is in normal operation, the power of all motors is 42.5kW, with two shifts per day and intermittent operation 16.

Hours, the unit price of electricity is 0.85 yuan/kW h, and the total power consumption per ton of slaughter wastewater is 0.23 yuan/t;

(2) Labor cost: 2 operators, each with a monthly salary of 450 yuan, and the labor cost is 0.2 1 yuan/t;

(3) Drug cost: the drug cost per ton of slaughter wastewater (uranium hypochlorite solution) is 0. 19 yuan/t;

(4) Maintenance fee: based on the annual maintenance rate of 65438+ 0.0% of the total investment, the maintenance fee is 0.05 yuan/t;

(5) Depreciation expense: If the annual depreciation rate of the total investment is 3.6% (in which the depreciation rate is 2. 1% and the overhaul rate is 1.5%), the maintenance fee is 0. 18 yuan/t;

(6) Total execution cost: 0.86 yuan/t;

(7) Project cost: The total investment of this project is 295,000 yuan, and the daily treatment of slaughter wastewater is 1.80 tons, and the cost index is 1.65 yuan/ton.

How to reduce the energy consumption of sewage treatment station is mainly reflected in the consumption of aeration and water pump, and we can basically find ways through these two aspects.

How to reduce the ammonia nitrogen content of effluent from the secondary sedimentation tank of sewage treatment? You can use the ammonia nitrogen remover in Shenzhen Changlong.

When the ammonia nitrogen in sewage reaches a certain concentration, advanced treatment methods such as chemical precipitation are adopted to reduce the ammonia nitrogen content.

Influence of biodegradability of sewage on sewage treatment If sewage can be treated by biochemical method, it is the best method, because less chemicals will be added in the process and secondary pollution accidents will not occur, so the basic trend of technology now is to add less chemicals for treatment. Adopt membrane treatment, etc.

How to treat salty wastewater? In direct proportion, the higher the conductivity, the higher the salt content, or the higher the salt content, the higher the conductivity.

Because salt is soluble in water, Cl ions and Na ions are formed, which makes it easier to conduct electricity.

Can Defeng Biological Wastewater Treatment Bacteria Treat Refractory Wastewater? Sewage treatment is better at ph7-8. The anaerobic front needs constant alkalinity. High PH affects the metabolism of microorganisms and is beneficial to the removal of organic matter.

How to deal with the sludge from the laundry wastewater sewage treatment station The common disposal methods are as follows:

Landfill: sanitary landfill is simple in operation and low in cost. After digestion, the organic content of sludge is reduced, the efficiency is relatively stable, and the total volume is reduced. Landfill after dehydration has become an economical sludge treatment method.

Fertilizer production and utilization: Sludge fertilizer was once the main way of sludge utilization. Its essence is to use aerobic microorganisms in sludge to oxidize and decompose various organic substances in sludge and transform them into humus substances that plants can easily absorb, so as to realize the utilization of biomass and save energy.

Drying: Sludge drying technology refers to the use of heat to destroy the gel structure of sludge and disinfect it. Drying temperature above 95℃ can not only effectively kill pathogenic bacteria, but also significantly reduce sludge volume and eliminate odor.