7results about How to "Improve phosphorus removal effect" patented technology

The invention belongs to the field of wastewater treatment, and discloses a method for inhibiting low-temperature sludge bulking by adding diatomite. The method comprises the following steps: treating sewage by adopting an activated sludge process under the condition that the water temperature is 4-15 DEG C, monitoring the settling property of the sludge during sewage treatment, adding a diatomite dispersion liquid into a biochemical reaction zone when the sludge expands, so that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L, and after the diatomite dispersion liquid is added, adding the diatomite dispersion liquid into the biochemical reaction zone to ensure that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L, so that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L; the inhibition of low-temperature sludge bulking can be realized; the diatomite dispersion liquid is obtained by fully dispersing diatomite with the particle size of 2-50 microns in water. The invention provides a more economical and efficient method for controlling low-temperature sludge bulking.

This invention discloses an online detection method for the working status of a descaling nozzle in a rolling mill, relating to the field of hot rolling technology. Its main purpose is to avoid product waste, reduce production costs, and improve detection efficiency. The main technical solution of this invention is as follows: The detection method includes: placing a calibration plate coated with a detection coating at a designated position above the work rolls of the rolling mill; activating the descaling nozzle of the rolling mill and continuing for a first preset time to allow descaling water to wash over the detection coating, forming watermarks; acquiring characteristic parameters of the watermarks, including morphological and positional parameters; and determining the working status of the descaling nozzle based on a comparison of the characteristic parameters with preset parameter thresholds.

The utility model discloses an environment-friendly steel surface dephosphorization device, and relates to the technical field of dephosphorization. An environment-friendly steel surface dephosphorization device comprises a steel dephosphorization table, a guide assembly is fixedly mounted at the top of the steel dephosphorization table, a dephosphorization assembly is located on the steel dephosphorization table and comprises a plurality of cleaning cylinders, a plurality of cleaning frames, a plurality of gear rings, a plurality of gears, a dephosphorization box and a mounting box, and the dephosphorization box is fixedly connected to the top of the steel dephosphorization table; the multiple cleaning barrels are fixedly connected to the top of the steel dephosphorization table and located in the dephosphorization box, the multiple cleaning frames are rotatably connected to the interiors of the corresponding cleaning barrels, and through cooperation of the cleaning frames, the cleaning barrels, gear rings, gears and water supply pipes, the cleaning frames can rotate to clean phosphorus skin on the surfaces of steel bars; and flushing liquid can be discharged from the corresponding water outlets, so that the cleaning frame can perform 360-degree dead-corner-free phosphorus removal on the reinforcing steel bars under the cooperation of the flushing liquid, and the phosphorus removal effect on the reinforcing steel bars is further improved.

The present application relates to a kind of mine wastewater phosphorus removal treatment system and phosphorus removal method, belong to water body phosphorus removal technical field.The present application is creatively with nine water ferric nitrate and six water ferric chloride as iron source, glucose as carbon source and reducing agent, urea as alkali source, based on hydrothermal synthesis method, the particle material with four-iron oxide as core and carbon layer as shell is synthesized, then it is further oxidized by using hydrogen peroxide solution, more oxygen-containing groups are constructed, then lanthanum chloride is added for lanthanum doping, metal lanthanum modified material is obtained, finally after surface modification of polydopamine and amino silane coupling agent in turn, a kind of phosphorus removal agent is prepared, when it is used for phosphorus removal of mine wastewater in the phosphorus removal treatment system provided with electromagnet, only simple magnetic attraction treatment is needed, the separation and recovery of phosphorus removal agent can be realized, and at the same time, even in the face of strong acid mine wastewater, metal lanthanum in phosphorus removal agent still dissolves less, and the phosphorus removal effect is very good.

This application relates to the field of wastewater treatment technology, specifically disclosing a method for rapid cultivation and stable operation of aerobic granular sludge in low-concentration municipal wastewater. The method includes adding sodium acetate, potassium dihydrogen phosphate, and allyl thiourea to low-concentration municipal wastewater with COD ≤ 200 mg / L. After addition, the COD concentration of the influent increases by 100–200 mg / L, and the PO4 concentration decreases by [missing value]. 3‑ The concentration of -P is increased by 2.5–5.0 mg / L, and the concentration of ATU is increased by 5–10 mg / L. Then, activated sludge from a conventional municipal wastewater treatment plant is inoculated into the reactor at a concentration of 3000–6000 mg MLSS / L. The aerobic granular sludge is cultivated in cycles of 3–4 hours, following the sequence of influent, stirring, aeration, sedimentation, and effluent discharge. The volume exchange ratio per cycle is 33%–50%. When granulation reaches over 80%, the system enters a stable operation period. At this time, only low-concentration municipal wastewater is used as influent, with each cycle lasting 4–6 hours, and the volume exchange ratio per cycle increasing to 50%–75%. The purpose of this patent is to solve the problem of the long start-up period and difficulty in maintaining stable operation when cultivating aerobic granular sludge using low-concentration municipal wastewater.

The utility model discloses an integrated sewage treatment system relates to sewage treatment technical field, and this system includes the pretreatment unit, biochemical treatment unit, secondary treatment unit and sludge treatment unit that connect gradually, and biochemical treatment unit includes the anaerobic pool, the anoxic MBBR pool and CWSBR biological pool that connect gradually, and CWSBR biological pool includes the aerobic MBBR pool, reaction area and balance area that arrange gradually, and secondary treatment unit is used to carry out flocculation precipitation and filtration treatment to sewage, and sludge treatment unit is used to carry out centralized treatment to the sludge of each unit generation, the utility model discloses through multistage biochemical coupling and depth treatment combination, and the efficiency of denitrification and phosphorus removal and the anti -impact load capacity of a large margin are promoted, and the effluent quality is stable, and the sludge centralized disposal, and the system integration degree is high, and the land area is small, and the operation cost is low, is applicable to town sewage and industrial waste water treatment.

This invention discloses an apparatus and method for coupling ferroammonia oxidation and anaerobic ammonia oxidation of Fenton waste sludge, comprising an influent tank, a five-stage reactor, a secondary sedimentation tank, and a Fenton reactor connected in sequence. This invention enriches the ferroammonia-oxidizing bacteria in the activated sludge by recirculating the sludge (containing ferric iron) produced in the Fenton reactor to the five-stage reactor. The nitrite and nitrate nitrogen produced by ferroammonia oxidation are directly or indirectly utilized by anaerobic ammonia-oxidizing bacteria on the packing material for anaerobic ammonia oxidation. The nitrate nitrogen produced in the aerobic zone can be denitrified using carbon sources and ammonia nitrogen in the influent through short-cut denitrification anaerobic ammonia oxidation. This invention achieves volume reduction and harmless treatment of Fenton waste sludge, achieving high nitrogen and phosphorus removal efficiency in industrial wastewater while removing recalcitrant organic matter.