Integrated treatment equipment for domestic sewage, which is the water discharged from people's daily lives. It is the water discharged from living facilities such as kitchens, bathrooms, bathrooms, and laundry rooms in households, public facilities (restaurants, hotels, cinemas, sports venues, government agencies, schools, and shops), and factories.
1、 Analysis of Domestic Sewage Content
1. Chemical oxygen demand (COD) refers to the amount of oxidant consumed when treating water samples with strong oxidant under certain conditions, expressed in mg/L of oxygen. Chemical oxygen demand reflects the degree of water pollution by reducing substances.
2. Five day biochemical oxygen demand (BOD) refers to the amount of dissolved oxygen consumed by microorganisms in the biological chemical process of decomposing some oxidizable substances in water under specified conditions, especially organic substances. Five day biochemical oxygen demand reflects the content of biodegradable organic matter in water.
3. Suspended solids (SS) refer to the total unfilterable residue dried at 103-105 ℃. The presence of suspended solids in water can make the water turbid, reduce transparency, and affect the respiration and metabolism of aquatic organisms. In water and wastewater treatment, measuring suspended solids has specific significance.
4. Total nitrogen (NT): When a certain amount of nitrogen is present in a water body, it can cause vigorous reproduction of plankton and lead to eutrophication. Therefore, total nitrogen is one of the important indicators for measuring water quality.
3、 Equipment composition
1) Grille: Two artificial grids are set up before the production wastewater enters the pre aeration regulating tank to remove large suspended solids, animal fur, and some animal and plant oils, in order to avoid blockage of water pumps and pipelines, reduce the subsequent treatment load, and ensure the smooth progress of subsequent treatment.
2) Due to the large amount of grease in the raw water of the air flotation tank, pre-treatment is necessary to reduce the pressure of subsequent treatment and ensure the treatment effect. The air flotation method can effectively remove small particle size oil splashes and emulsified oil, with a significant oil removal effect.
3) Due to the strong variability of raw water flow and discharge time, a regulating tank is set up to balance the quality and quantity of raw water, reduce the impact on subsequent projects, and achieve treatment results. It also has a partial hydrolysis effect.
4) The hydrolysis acidification process in the hydrolysis acidification tank is the pre anaerobic process, which functions to degrade organic macromolecular substances such as oil, fat, and protein into organic low molecular substances. Convenient for aerobic process treatment.
5) The integrated treatment equipment for domestic sewage is a new type of product with obvious characteristics and outstanding advantages in China's integrated treatment equipment, consisting of three parts: a composite tank body, an underwater aeration system, and an electric control system. The sewage is in full contact with the oxygen and activated sludge introduced by the aeration system in the composite tank for biochemical degradation treatment. The degraded activated sludge enters the sedimentation tank for sedimentation through a concave groove at the bottom of the biochemical tank, and the treated sewage meets the discharge standards.
4、 Equipment characteristics
1) It has fast processing speed: the dwell time inside the machine is ≤ 3 minutes
2) Small overall area: 100m3/H, covering an area of ≤ 25m2
3) Electricity consumption: ≤ 1.5Kw per ton of water treatment electricity consumption
4) High floatation degree of effluent: SS removal rate>90%; removal viscosity>99%
5) High sludge drying degree: solid content ≥ 20%
6) Low noise:<60 decibels
7) No need for backwashing, stable and reliable automated operation.
8) It can greatly save the maintenance and upkeep costs of domestic sewage treatment equipment, as well as various expenses such as technical personnel and operators.
9) It can replace air flotation or sedimentation tanks in water treatment projects and is a revolutionary alternative to traditional treatment methods
5、 Basic requirements
1. The requirements for equipment welding and manufacturing refer to JB2932-99 "Technical Conditions for Manufacturing Water Treatment Equipment";
2. The pipeline is connected to the main body through flanges, taking into account the convenience of maintenance and component replacement; The materials of internal components comply with the specified requirements, and fasteners meet the anti-corrosion requirements.
3. The internal components are fixed and reinforced to withstand the impact of water flow.
4. The internal devices, fittings, components, etc. of the container should be installed and fixed inside the container before shipment to prevent missing parts and damage or loss during transportation.
5. The epoxy anti-corrosion material used internally has good corrosion resistance and wear resistance, ensuring that the coating will not fall off during its service life.
6. The material requirements of domestic wastewater treatment equipment must be fitness, water quality and long service life.
5. Ammonia nitrogen (NH3-N) exists in water as free ammonia or as a salt. The main source of ammonia nitrogen in water is the decomposition products of nitrogen-containing organic compounds in domestic sewage by microorganisms. Measuring the ammonia nitrogen content in water can help evaluate the pollution and "self purification" status of water bodies.
6. Total phosphorus (PT) is one of the essential elements for biological growth, but high phosphorus content in water can lead to excessive algae reproduction and eutrophication of the water.
2、 Design principles
1. Combining clean production, pollution source management, sewage standard treatment, and total amount control, propose a practical and feasible engineering design system.
2. In response to the production and wastewater quality situation of the company, advanced and reliable wastewater treatment processes with stable heat generation, high treatment efficiency, and low operating costs are selected to ensure that the effluent meets the discharge standards.
3. Choose integrated processing equipment with reliable quality, easy maintenance, low energy consumption, and high cost-effectiveness to minimize the operating costs of the system as much as possible.
4. Fully consider the situation of the wastewater treatment station and strive to reduce sludge discharge in the treatment process.