CN1994935B - Odor-free energy-saving micro aerobiont combined processing system for cabaret sewage processing and reusing - Google Patents

Abstract

The invention discloses a non-odor microbe biological processing combining technique of hotel effluent, which is characterized by the following: making hotel effluent enter adjusting pond to do anaerobic microbe disposal, two-grade microbe biological disposal, two-grade aerobic biological disposal; proceeding air-float disposal after concreting; filtering through quartz sand and active charcoal; sterilizing through UV; recycling living effluent.

Description

An odorless and energy-saving micro-aerobic biological treatment combined process system for hotel sewage treatment and reuse

Technical field

The invention relates to an odorless and energy-saving micro-aerobic biological treatment combined process system for hotel sewage treatment and reuse, which belongs to the sewage treatment process.

Background technique

According to the sources of hotel sewage, there are mainly the following types:

(1) Kitchen sewage: contains organic matter, solid impurities, and high oil content.

(2) Sewage from toilets in guest rooms: sewage from toilet flushing and washing, mainly containing organic matter, solid impurities, bacteria, detergent and soap.

(3) Washing car waste water: mainly solid impurities and petroleum grease.

(4) Wastewater discharged from the boiler room: sewage discharged from the boiler and softened regeneration waste liquid, the water mainly contains salt.

(5) Air-conditioning cooling wastewater: mainly thermal pollution.

(6) The filter tank flushing wastewater and swimming pool sewage wastewater of circulating water in indoor swimming pools or bathing centers.

(7) Laundry drainage: mainly contains surface active substances and phosphorus.

(8) For garden-style resort hotels with water features, ornamental fish ponds, etc., there will also be water features circulating water.

At present, biochemical methods are widely used in hotel sewage. As the main facility of biological treatment, the biological turntable has stable operation, convenient management, low noise, low operating cost, impact load resistance, and low sludge output, suitable for hotels with small and medium water volumes. The BOD ₅ area load of the biological turntable system is 16.7gBOD ₅ /(m ² ·d), the HRT is 1h, and the rotation speed of the turntable is adjusted accordingly with the change of the hydraulic load. Chlorine disinfection contact time 45min. The use of four-stage biological turntable followed by sand filtration can fully guarantee the final water quality, but attention should be paid to the timely cleaning of the degreasing tank

The SBR process operates intermittently in a single pool, with high substrate concentration, accompanied by aerobic, anoxic, and anaerobic biochemical reaction processes, which can effectively remove nitrogen and phosphorus in kitchen and laundry sewage, and has strong impact load resistance. As a technical discussion, two SBR tanks are connected in series to treat the wastewater from the Shangri-La Hotel in Harbin. The removal rate of pollutants in the sewage is basically the same, but the fluctuation of the water quality of the two-stage SBR effluent is smaller and the water quality is slightly better. The two-stage SBR method treats hotel sewage. Most of the organic matter (about 60%) has been removed in the first stage. This part of the organic matter has not undergone sufficient oxidation and decomposition for a long time, which saves the amount of aeration and energy consumption required for biological oxidation. The reaction time and removal rate are mainly achieved through biological flocculation, high-efficiency adsorption, sedimentation net capture and adsorption degradation. The adsorbed organic matter can be removed through sludge discharge, so that some refractory substances can also be removed through sludge.

The DAT-IAT process is an improved process of the SBR process. It also operates in series with two reaction tanks. DAT maintains continuous water inflow and aeration, and IAT operates intermittently. Such a dual system can avoid hydraulic short circuit, and occupies a small area, and can perform nitrogen removal. Phosphorus removal. The sewage first passes through the preliminary biochemical treatment in the DAT section and then enters the IAT section. The continuous aeration plays a role in hydraulic balance and improves the stability of the entire process. Then, the organic pollutants in the sewage are further removed in the IAT section through microbial degradation. The hydraulic retention time of the average flow rate of the reaction tank is 16.5h, and the sludge age is 44.3d, which can remove refractory organic matter.

The biological aerated filter is often used in combination with the hydrolysis and acidification process. The hydrolysis tank is mostly an improved version of the upflow anaerobic sludge bed (UASB). There is a certain height of sludge layer in the tank, which integrates biological degradation and physical settlement. Integrated with biosorption, the particulate and colloidal pollutants in sewage are trapped and adsorbed, and degraded under the action of microorganisms such as acid-producing bacteria. The hydrolysis tank can significantly remove Escherichia coli and roundworm eggs, etc., and can improve and enhance the biodegradability of raw water, which is conducive to subsequent aerobic treatment, and also reduces sludge production. And the moisture content of the sludge is 75%-80% after being treated by the integrated equipment of concentration and dehydration, and can be used as fertilizer. Upflow Biological Aerated Filter (UBAF), with a filter layer height of 3m, an aeration pipe system is set at a height of 1m in the filter layer, so that the filter layer forms an anoxic zone and an aerobic zone, and part of the effluent is returned to the inlet The water area is internally circulated to achieve the purpose of denitrification in the anoxic area. Aluminum salt is used as phosphorus removal agent, and the phosphate precipitate formed by the reaction is removed through fiber filter.

Contents of the invention

The purpose of the present invention is to provide an energy-saving and odorless new technology for hotel sewage treatment and reuse, which uses anoxic biological treatment-secondary micro-aerobic biological treatment-secondary aerobic biological treatment-air flotation-filtration-UV sterilization Disinfection combination process treats hotel sewage to make it meet the domestic miscellaneous water quality standard.

The technical solution of the present invention is that after the hotel sewage enters the adjustment pool for balanced adjustment of water quality and water volume, it enters the anoxic biological treatment pool through the lifting pump for short-term facultative biological hydrolysis and acidification, and the waste water overflows into the secondary micro-aerobic biochemical pool For biochemical treatment, the effluent flows into the secondary aerobic biochemical tank for aerobic biochemical treatment, and then coagulation and air flotation treatment is carried out by adding coagulant, and finally, it is returned through quartz sand filtration, granular activated carbon secondary filtration and UV disinfection. The reused water can meet the domestic miscellaneous water standard.

The method of the present invention and its characteristics are that it is formed by the optimized combination of biochemical treatment process and physicochemical treatment process. Oxygen biological treatment process is sequentially optimized and combined with integrated integrated equipment; the physical and chemical treatment is a sequential combination of coagulation air flotation and quartz sand filtration, granular activated carbon filtration and UV sterilization processes as subsequent treatment processes.

The biological treatment tanks are all biological contact oxidation tanks, and biological fillers are installed in the tanks, such as combined fillers, elastic three-dimensional fillers, and microporous aeration systems are installed at the bottom of the microaerobic biological tank and the aerobic biological tank. The DO in the oxygen pool is controlled at 0.3-0.5 mg/L and 0.5-1.0 mg/L respectively, and the DO in the secondary aerobic biochemical tank is controlled at 1.5-2.0 mg/L and 2-4 mg/L respectively.

In the subsequent physical and chemical treatment process, the coagulant is aluminum salt, such as PAC, Al ₂ (SO ₄ ) ₃ ; the air flotation adopts partial reflux pressurized dissolved air flotation; the filter adopts quartz sand filtration, or quartz sand filtration plus Subsequent granular activated carbon filtration; sterilization and disinfection using UV254.

The beneficial effects of the present invention are: (1) the residence time of anoxic biological treatment is short, no stench will be produced, and the _H2S odor pollution that occurs in conventional anaerobic biological treatment is eliminated; (2) the microaerobic biological treatment process will not produce Odor pollution eliminates the odor of anaerobic treatment. Compared with aerobic treatment, it reduces the amount of aeration and energy consumption; (3) Anoxic, microaerobic and aerobic biological treatment processes are optimized in sequence The treatment effect is good, the organic matter removal efficiency is high, and the effluent can reach the national comprehensive sewage first-level discharge standard. After subsequent air flotation, filtration and UV disinfection treatment, the effluent meets the water quality standards and requirements for reused water and can be used as miscellaneous domestic water.

Description of drawings

Fig. 1 is a schematic diagram of the process flow of the present invention.

Detailed ways

Example 1

Certain hotel sewage, water quality characteristic as shown in table 1, adopts Fig. 1 process flow of the present invention to process. In the adjustment pool, the HRT is 8 hours; the anoxic pool is 2 hours; the HRT of the first-level micro-oxygen pool is 3 hours, and the DO is 0.5-0.8 mg/L; the HRT of the second-level micro-oxygen pool is 2 hours, and the DO is 1.0-1.5 mg/L; The HRT of the aerobic pool is 3 hours, and the DO is 1.5-2.0 mg/L; the HRT of the secondary aerobic pool is 2 hours, and the DO is 2-4 mg/L; the coagulant is PAC, and it operates normally under the condition of 5-10 mg/L After treatment, the final effluent is better than domestic miscellaneous water quality standards and requirements after being filtered by quartz sand, activated carbon and UV sterilization. The processing results are shown in Table 1. In addition, no peculiar smell such as H ₂ S occurs during the treatment process, and the treatment system saves energy consumption by more than 20% compared with conventional processes.

Table 1 Water quality characteristics and treatment results (mg/L)

Claims (1)

1. An energy-saving and odorless hotel sewage treatment and reuse process, which uses a combined process of anoxic biological treatment-secondary microaerobic biological treatment-secondary aerobic biological treatment-air flotation-filtration-UV sterilization and disinfection to treat hotels Sewage to meet domestic miscellaneous water quality standards; the HRT of the anoxic pool is 1h, only short-term anoxic hydrolysis and acidification, no H2S odor is produced; biological fillers are installed in the pool to increase the concentration of anaerobic and facultative bacteria , use the first stage of anaerobic biochemistry to improve the biodegradability of wastewater, effectively degrade organic matter, avoid the problem of H ₂ S odor pollution control in the anaerobic process, and simplify the control; the second stage of micro-aerobic biological treatment adopts Biological filler and microporous aeration system, in which the HRT of the first-level micro-aerobic pool is 3h, and the DO is 0.5-0.8mg/L; the HRT of the second-level micro-aerobic pool is 2h, and the DO is 1.0-1.5mg/L; The biological treatment process adopts biological filler and microporous aeration system, in which the HRT of the primary aerobic tank is 3 hours, DO is 1.5-2.0 mg/L, and the HRT of the secondary aerobic tank is 2 hours, DO is 2-4 mg/L; The subsequent physical and chemical process of biological treatment is the sequential combination of coagulation air flotation, filtration and UV sterilization and disinfection processes. The coagulant is PAC; the air flotation is partial reflux pressure dissolved air flotation process; UV technology, the main wavelength of 253.7nm ultraviolet light sterilization and disinfection, to ensure that the effluent is stable and meets the reuse requirements.