High effective to remove nitrogen process in abattoir wastewater treatment

A new method of membrane sequencing batch reactor (MSBR) process in abattoir wastewater treatment is given. With nitrification and denitrification bacterium, it is effective to remove nitrogen. At the same time, the whole system can be autocontrolled and do not add any drugs or bacteriums again after it runs. The experimental results show that the quality of abattoir wastewater can attain to the national requirements of the first grade of integrated wastewater discharge standard (GB 8978 - 1996). About 45–65% of the solids or approximately 30–40% of the biological oxygen demand (BOD) load can be separated by pre-treatment screening and sedimentation. MSBR systems are lagoon, membrane sequencing batch reactor (MSBR), biological treatment and membrane filter (MF) processes. Abattoir wastewater is well suited to MSBR treatment because it is high in organic compounds. Typical reductions of up to 98% BOD, 93% SS, 98% COD, 95% NH3-N and 95% lipin are approved. Wastewater in abattoirs can be reduced by membrane filtration which can produce recyclable water. Total COD can be reduced below 100 mg/L. The performances of both sequencing batch reactor (SBR) process and membrane sequencing batch reactor (MSBR) process operating simultaneously under the same condition to treat abattoir wastewater were examined. Conventional SBR treatment average COD removal efficiencies are of 85–90%. MSBR average COD removal efficiencies are of 98%. The result show that MSBR process has better treatment effect and is easier to operate and manage compared with SBR process. MSBR is a new method of abattoir wastewater treatment and has a broad prospects.

Abattoir wastewater is well suited to MSBR treatment because it is high in organic compounds. The experimental results show that the quality of abattoir wastewater can attain to the national Table 3 Performance of MSBR in treating abattoir wastewater Parameter Original wastewater Effluent Removal (%) Cost energy (kw/m3) Project investment ($/m3) CODcr (mg/L) BOD5 (mg/L) NH3-N (mg/L) Fat and grease (mg/L) 5890.8–8950.4 2890.3–3685.5 93.8–150.5 24.5–32.4 8.5 8.2 5.6 0.7 98.8 99.7 95.4 97.5 0.6 requirements of the first grade of integrated wastewater discharge standard (GB 8978 - 1996). Typical reductions of up to 98% BOD, 93% SS, 98% COD, 95% NH3-N, 98% phosphorus and 95% lipin are approved. Wastewater in abattoirs can be reduced by membrane filtration which can produce recyclable water. Total COD can be reduced below 100 mg/L. This wastewater treatment method is easy to operate and manage. The project investment reduction is up to 45%. The effluent is stabilization. This technology has been used in Guangning abattoir plant for three years. It is much of benefit and has a broad prospects.