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This resulted in greatly improved stream and river water quality, but created another material to deal with: sewage sludge. Approximately 99% of the wastewater stream that enters a treatment plant is discharged as rejuvenated water. The remainder is a dilute suspension of solids that has been captured by the treatment process. These wastewater treatment solids are commonly referred to as sewage sludge.
The term "biosolids" recently has been introduced by the wastewater treatment industry. The industry defines biosolids as sewage sludge that has undergone sufficient treatment for stabilization and pathogen reduction, and that is of sufficiently high quality to be land applied. The term is intended to distinguish high-quality, treated sewage sludge from raw sewage sludge and from sewage sludge that contains large quantities of environmental pollutants. The term "biosolids" also helps to distinguish sewage sludge from industrial sludge by emphasizing that the former is produced by a biological process. The term has been criticized by some as an attempt to disguise the real nature of sewage sludge, thereby making land application of this material less objectionable to the general public. Although "biosolids" undoubtedly does not conjure up the same negative images as does "sewage sludge" or simply "sludge," it is a legitimate and functional term when correctly used to make the distinction described above. In this document, "sewage sludge" will be used to refer to wastewater treatment solids generally, and "biosolids" will be used to refer specifically to material that is suitable for land application.
Municipal wastewater, or sewage, refers to water that has been used in urban and suburban area homes or businesses for washing, bathing, and flushing toilets. Municipal wastewater also may include water from industrial sources. To remove chemicals or pollutants resulting from industrial processes, industrial contributors to municipal wastewater systems must pretreat their wastewater before it is discharged into the sewerage system. The wastewater is conveyed via the sanitary sewerage system to a centralized wastewater treatment plant (sometimes called a Publicly Owned Treatment Works, or POTW). At the POTW, the sewage passes through a series of treatment steps that use physical, biological, and chemical processes to remove nutrients and solids, break down organic materials, and destroy pathogens (disease-causing organisms) in the water. The rejuvenated water is released to streams and rivers, or may be sprayed over large areas of land.
Preliminary treatment of raw sewage involves screening to remove large objects such as sticks, bottles, paper, and rags, and a grit removal stage during which inorganic solids (sand, grit, cinders) rapidly settle out of the water. The screenings and grit removed in this stage of treatment typically are landfilled and do not become part of the sewage sludge.
Primary treatment involves gravity sedimentation and flotation processes that remove approximately half of the solid material that enters this stage. Solid material (both organic and inorganic) that settles out during this stage of treatment is drawn from the bottom and constitutes the primary sludge. In most POTWs, the floating material (oil, grease, wood, and vegetable matter) that is skimmed from the water surface during primary treatment is disposed of separately and does not become part of the primary sludge.
Secondary treatment is a carefully controlled and accelerated biological process in which naturally occurring microorganisms are used to degrade (break down or digest) suspended and dissolved organic material in the wastewater. This material is converted into carbon dioxide that is released to the atmosphere and into microbial cell mass.
In secondary sedimentation basins, the microbial cell mass settles to the bottom and is removed. This mainly organic material is called secondary sludge.
Some treatment plants also include tertiary treatment steps designed to further reduce plant nutrients (nitrogen and phosphorus), suspended solids, or biological oxygen demand in the wastewater. Chemically precipitated phosphorus and filtration produce a tertiary sludge.
Finally, the water undergoes disinfection treatment to destroy pathogenic microorganisms. The rejuvenated water is then released to a stream or river or may be sprayed over large areas of land.
Introduction to purification treatment vehicle · H3| model | H3 |
| Picture | |
| Introduction | purification treatment function: solid-liquid separation, liquid medicine mixing, fecal classification system and independent power generation. The biggest advantages of this model: 1The whole equipment and core parts are made of 304 stainless steel, which increases the service life of the equipment and reduces the maintenance cost. 2The front-end garbage separation adopts the spiral extrusion separation technology, which has made a breakthrough in the previous technology. The parts are movable assembly and combination, which is convenient for disassembly, maintenance and repair, and fundamentally solves the problem of "blockage". 3The fecal water separation system adopts the stacked screw sludge dewatering technology. Through technical improvement, the screw two-way operation is successfully realized, which skillfully avoids the common blockage problem of the traditional dehydrator.At the same time, the treatment speed is improved and the moisture content of mud cake is reduced. 4Two models have been introduced. On the basis of the original carbon steel, an all stainless steel product has been added to increase customer selectivity. |
| Incidental parts |
One generator, one electric box, one set of fecal suction pipe and four sets of joints |
| Serial number | entry name | Company | parameter |
| 1 | Overall dimension (length)×wide×High) | m | 4.2*2.2*2.4 |
| 2 | Vehicle specification | m | 5995*2200*3600 |
| 3 | the stipulated number of personnel | people | 3 |
| 4 | Curb weight | t | 5.5 |
| 5 | Loading volume | m³ | ≥3.16 |
| 6 | Compression box (long)×wide×High) | m | 1.72*0.8*0.9 |
| 7 | Front end press | set | 1 |
| 8 | Vacuum pump | kw | 7.5 |
| 9 | Dosing pump | kw | 1 |
| 10 | Maximum negative pressure of vacuum pump | KPa | - 80 |
| 11 | Liquid medicine suction pump | kw | 0.75 |
| 12 | Vacuum pump water tank (L * w * h) | m | 1.5*0.23*0.85 |
| 13 | Inspection port (length * width) | m | 0.57*0.47 |
| 14 | Height of slag outlet | m | 1.35 |
| 15 | Maximum pumping speed | m³/h | 50 |
| 16 | Maximum processing speed | m³/h | 20 |
| 17 | Maximum suction lift | m | 8 |
| 18 | Max Power consumption | Degree / h | 18 |
| 19 | Equipment generator | kw | 30 |
| 20 | Maximum fuel consumption | L | 4 |
| 21 | Ring test compressor (diameter) | mm | 350 |
| 22 | Liquid medicine mixer | kw | 0.4*3 |
| 23 | Mixing mixer | kw | 0.4*1,1.1*1 |
| 24 | Motor inductor | w | 0.01 |
| 25 | Electric gate valve | w | 180 |
| 26 | Dongfeng chassis model | model | EQ1070SJ3BDF |
| 27 | Vehicle engine | model | YC4E115-50 |
| 28 | Chassis power | kw | 85 |
| 29 | wheelbase | mm | 3306 |
| 30 | Tire specification | 7.50-16 8PR | |
| 31 | Vehicle license plate | Yellow card | |
| 32 | emission standard | Euro 3-6 |
| ★★ technical specifications and parameters of 30kW Weifang series diesel generator set ★★★ | |
| ★ technical parameters of generator set: | |
| Unit model: hq30gf | Steady state voltage regulation rate (%): ≤± 1 |
| Output power: 30KW | Voltage fluctuation rate (%): ≤± 0.5 |
| Power factor: cosΦ=0.8 (lag) | Transient voltage regulation rate (%): + 20 ~ - 15 |
| Output voltage: 400V / 230V | Voltage stabilization time (s): ≤ 1 |
| Output current: 54a | Steady state frequency adjustment rate (%): ≤± 1 |
| Rated frequency: 50Hz | Frequency fluctuation rate (%): ≤± 0.5 |
| Rated speed: 1500rpm | Transient frequency adjustment rate (%): + 10 ~ - 7 |
| Fuel grade: (standard) 0# light diesel (normal temperature) | Frequency stabilization time (s): ≤ 3 |
| Overall dimension: 1650×six hundred and fifty×1300(L×W×H (mm, Ref.) | Fuel consumption (100% load): 224g / kW · H |
| Unit weight: 600kg (Reference) | Noise (lp7m): 105dB (a) |
| ★ technical parameters of diesel engine: | |
| Brand / origin: Weifang Diesel Engine | Cooling mode: closed water circulation cooling |
| Oil engine model: zh4100d | Oil supply mode: direct injection |
| Number of cylinders / lifting structure: 4 / L type | Speed regulation mode: mechanical speed regulation |
| Cylinder bore stroke: 100×115 mm | Air inlet mode: natural suction |
| Compression ratio: 19.0:1 | Overload capacity: 110% |
| Start mode: DC12V electric start | Speed: 1500rpm |
| ★ technical parameters of generator: | |
| Motor brand: | Protection grade: IP21 |
| Motor model: hqf-30 | Wiring mode: three-phase four wire, Y-type connection |
| Rated power: 30KW | Regulation mode: AVR (automatic voltage regulator) |
| Rated voltage: 400V / 230V | Output frequency: 50Hz |
| Insulation class: Class H | Output factor: cosΦ=0.8 (lag) |
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